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• How do correspondence tables cover other classifications?

  Tables between NACE and ISIC, CPA, CN and MIGs, and how a cross classification table differs from a version table. (How to read a correspondence table)

• How do correspondence tables differ from explanatory notes?

  The table as a record of relationships, the notes as definitions of scope, and why both are needed for a move. (How to read a correspondence table)

• How do correspondence tables help compare statistics over time?

  Backcasting, double reporting, and the limits of converting a series from the table alone. (How to read a correspondence table)

• How do you check a move in both directions?

  Reading the Rev. 2 to Rev. 2.1 table forward and reverse, why types reverse, and how to state the direction. (How to read a correspondence table)

• How do you read a many to many row?

  How a many to many row shows identical joint scope without individual correspondence, and how to treat the group as a whole. (How to read a correspondence table)

• How do you read a many to one merge row?

  How a merge row combines old scopes into one new class, using the verified agriculture and wholesale merges. (How to read a correspondence table)

• How do you read a one to many split row?

  How a split row divides an old scope among new classes, using the verified wood class split as the worked example. (How to read a correspondence table)

• How do you read a one to one row?

  How a one to one row shows identical scope, what to verify in the notes, and why the row still needs a version label. (How to read a correspondence table)

• What are the four correspondence types?

  The one to one, many to one, one to many and many to many types, their counts, and what each type permits. (How to read a correspondence table)

• What does a correspondence table not decide?

  The limits of a correspondence table for codes, entries, eligibility, and series conversion, and where each question is decided. (How to read a correspondence table)

• What is a correspondence table?

  The two types of correspondence table, what each type compares, and where the NACE Rev. 2 to Rev. 2.1 table sits. (How to read a correspondence table)

• Where are the official correspondence tables published?

  The Eurostat correspondence tables page, ShowVoc, the manual passage, and the national institute copies to check. (How to read a correspondence table)

• How do explanatory notes show borderline cases?

  Boundary examples in notes, cross references between neighbouring classes, and the paired reading a borderline needs. (Explanatory notes and how they are used)

• How do notes differ by level?

  Section, division, group and class notes compared, the granularity each level carries, and the order to read them. (Explanatory notes and how they are used)

• How do notes handle a division heading?

  The division note as a field definition, using the verified Division 01 note, its mixed farming statement, and its implementation rule. (Explanatory notes and how they are used)

• How do notes handle a section heading?

  The section note as a broad scope statement, using the verified Section A note and its exclusion to class 98.10. (Explanatory notes and how they are used)

• How do notes use cross references to other classes?

  See references in excludes lists, the paired reading they require, and the chains they form across groups and sections. (Explanatory notes and how they are used)

• How do you quote a note without overreading it?

  Citing a note with its version and level, staying inside the words stated, and avoiding extension to a specific case. (Explanatory notes and how they are used)

• How do you read an excludes list?

  How an excludes list bounds a category, using the verified exclusions in the class 01.11 and class 01.13 notes. (Explanatory notes and how they are used)

• How do you read an includes list?

  How an includes list states covered activities, using the verified class 01.11 note as the worked example. (Explanatory notes and how they are used)

• How do you use a note before a correspondence table?

  The checking sequence from note to table to institute, and why the note must come first for a move. (Explanatory notes and how they are used)

• How does the NACE index fit the notes?

  The index as an integral part of the notes, its online publication through ShowVoc, and its new and evolving character. (Explanatory notes and how they are used)

• What do explanatory notes contain?

  Descriptions and annotations, the index, and the two parts that together make up the NACE Rev. 2.1 notes. (Explanatory notes and how they are used)

• What does includes also mean?

  The includes also annotation as a second list in a note, shown in the verified class 01.13 and class 01.15 notes. (Explanatory notes and how they are used)

• How do criteria change between levels?

  The criteria for classes, groups, divisions and sections, and why process matters most at class level. (Sections, divisions, groups and classes)

• How do sections divisions groups and classes nest?

  How the four levels nest, the rule that each lower category belongs to one category above, and how to follow a path. (Sections, divisions, groups and classes)

• How do you read a four digit code?

  How to split a four digit NACE code into division, group and class, find its section, and check its note. (Sections, divisions, groups and classes)

• How many categories are there at each level?

  The adopted counts for sections, divisions, groups and classes, where the counts come from, and what they do not count. (Sections, divisions, groups and classes)

• What does n.e.c. mean and why does digit 9 matter?

  The not elsewhere classified residual, the digit 9 pattern at group and class level, and how a residual completes a parent. (Sections, divisions, groups and classes)

• What happens when a level is not split?

  Unsplit sections, divisions and groups, the zero code pattern, and why repeated headings are not errors. (Sections, divisions, groups and classes)

• What is a class and why is it the most detailed level?

  What a class covers inside a group, how four digit codes work, and why class notes carry the finest distinctions. (Sections, divisions, groups and classes)

• What is a division and why are there gaps?

  What a division narrows inside a section, how two digit codes work, and why some division numbers are unused. (Sections, divisions, groups and classes)

• What is a group and how does it narrow a division?

  What a group covers inside a division, how three digit codes are formed, and how a group note sets its scope. (Sections, divisions, groups and classes)

• What is a section and how is it identified?

  What a section groups, how a section letter works, and the 22 section headings in NACE Rev. 2.1. (Sections, divisions, groups and classes)

• What makes categories exhaustive and mutually exclusive?

  Exhaustive coverage, mutually exclusive categories, and consistent allocation as the three characteristics of a statistical classification. (Sections, divisions, groups and classes)

• Why is the section letter not in the numeric code?

  The separation of the section letter from the numeric code, the manual example, and the lookup it requires. (Sections, divisions, groups and classes)

• How do French statistics use NAF 2025?

  How French statistics use NAF 2025, and how the French register date relates to the European data timetable. (France: NAF 2025 and APE recoding)

• How does the section letter shift work in France?

  How the section letter shift from the split of the old Section J works in France, and how to read French codes across the change. (France: NAF 2025 and APE recoding)

• How is a future APE code checked in Sirene?

  How a future APE code is checked in Sirene, what is needed for the check, and what the result shows. (France: NAF 2025 and APE recoding)

• How is a code read in a French dataset?

  How a code in a French dataset is read, including version, date and the limits of a bare code. (France: NAF 2025 and APE recoding)

• How is rectification of a future APE code requested?

  How rectification of a future APE code is requested through Sirene, and what happens after a request. (France: NAF 2025 and APE recoding)

• How is the NAF correspondence material used?

  How the correspondence material for NAF rev. 2 to NAF 2025 is used, and what it can and cannot show. (France: NAF 2025 and APE recoding)

• What changes for new and existing units in France?

  What changes for new and existing units in France under NAF 2025, and what stays the same. (France: NAF 2025 and APE recoding)

• What do the published APE examples show?

  What the APE examples published by Service Public show about format, and why they must not be used as new codes. (France: NAF 2025 and APE recoding)

• What does an APE code not decide in France?

  What an APE code does not decide in France, and why other bodies rules govern the questions readers often attach to the code. (France: NAF 2025 and APE recoding)

• What is an APE code?

  What an APE code is, how its format is built, and what the code does and does not show. (France: NAF 2025 and APE recoding)

• What is NAF 2025?

  What NAF 2025 is, when it becomes the reference for APE codes, and how it relates to NACE Rev. 2.1. (France: NAF 2025 and APE recoding)

• What is asked of INSEE or Sirene when checking a code?

  What to ask INSEE or Sirene when checking a code, and what information to have ready before asking. (France: NAF 2025 and APE recoding)

• How does the section letter shift work in Germany?

  How the section letter shift from the split of the old Section J works in WZ 2025, and how to read German codes across it. (Germany: WZ 2025)

• How is WZ 2025 introduced gradually?

  How WZ 2025 is introduced gradually into German official statistics, and which domain dates Destatis publishes. (Germany: WZ 2025)

• How many headings does WZ 2025 have?

  How many headings WZ 2025 has at each level, and how the counts compare with WZ 2008. (Germany: WZ 2025)

• How is the classification server searched?

  How the classification server is searched for WZ 2025 headings, and how index results are tested in the notes. (Germany: WZ 2025)

• How was WZ 2025 approved and published?

  How WZ 2025 was approved and published by Destatis, and where the classification and its keyword index are found. (Germany: WZ 2025)

• How were energy and waste restructured in Germany?

  How energy production and waste activities were restructured in WZ 2025, following the European changes. (Germany: WZ 2025)

• What are double reporting and backcasting in Germany?

  What double reporting and backcasting are in the German introduction of WZ 2025, and how they keep series comparable. (Germany: WZ 2025)

• What are the five levels of WZ 2025?

  What the five levels of WZ 2025 are, and how the fifth level differs from the European levels. (Germany: WZ 2025)

• What changed for intermediation in Germany?

  What changed for intermediation activities in WZ 2025, and how the new headings relate to the old groupings. (Germany: WZ 2025)

• What does a WZ code not decide?

  What a WZ code does not decide, and why other bodies rules govern the questions readers often attach to the code. (Germany: WZ 2025)

• What happened to Division 45 in Germany?

  What happened to Division 45 in WZ 2025, and where its activities sit in the German structure. (Germany: WZ 2025)

• What is WZ 2025?

  What WZ 2025 is, how it relates to NACE Rev. 2.1, and who publishes it in Germany. (Germany: WZ 2025)

• What is an aggregation in NACE statistics?

  An aggregation groups NACE categories into a smaller number of headings for publication, defined in the metadata, and it is not a NACE level. (Glossary and questions)

• What is a correspondence table?

  A correspondence table shows the relationship between categories in two classifications, or between two versions of one classification, pair by pair. (Glossary and questions)

• Does my code decide a collective agreement or social security status?

  No. A NACE code does not decide collective agreement coverage or social security status. Both are decided under the law and rules that govern them. (Glossary and questions)

• Does my code decide my licence or funding?

  No. A NACE code does not grant a licence, and it does not decide funding eligibility. Both are decided by the authority that administers them. (Glossary and questions)

• Does my code decide my tax?

  No. A NACE code is a statistical classification only. It does not set a tax rate, decide a tax status, or determine what tax is owed. (Glossary and questions)

• What is an explanatory note?

  An explanatory note states what a NACE category includes and excludes, and it is the record of meaning for that category. (Glossary and questions)

• How do NACE, ISIC and national variants fit together?

  ISIC is the international standard, NACE is the European derivation, and national variants add detail below the shared levels, each confirmed with its own institute. (Glossary and questions)

• How does NACE differ from NAICS?

  NACE is the European classification derived from ISIC, while NAICS is the North American system for the United States, Canada and Mexico, and the two are compared only through correspondence. (Glossary and questions)

• How does NACE differ from UK SIC?

  UK SIC 2007 was revised in parallel with NACE Rev 2 and is identical to NACE to four digits, with a fifth digit for United Kingdom detail. (Glossary and questions)

• What is a principal activity?

  A principal activity is the activity that contributes most to the value added of a unit, and it is the basis on which the unit is coded in statistics. (Glossary and questions)

• What do section, division, group and class mean?

  Section, division, group and class are the four levels of NACE, from the broadest letter heading to the most detailed four digit class. (Glossary and questions)

• What is a statistical unit?

  A statistical unit is the entity classified in statistics, such as an enterprise, an establishment, or a legal entity, and the code held depends on the unit type. (Glossary and questions)

• What alignment between ISIC Rev 5 and regional classifications is claimed?

  The Division claims only increased alignment with existing regional classifications in general, and no specific NACE alignment detail is asserted here. (NACE and ISIC: how the two classifications relate)

• How is a correspondence table between NACE and ISIC read?

  A NACE to ISIC correspondence table shows the relationship between all positions of the two classifications, and its mapping type must be recorded for each pair. (NACE and ISIC: how the two classifications relate)

• How is an ISIC reference cited?

  An ISIC citation names the classification, the revision, the category, the document consulted, and the check date, so the reference can be repeated. (NACE and ISIC: how the two classifications relate)

• How does ISIC relate to product classifications?

  ISIC classifies activities, while CPC, CPA, PRODCOM and the Combined Nomenclature classify products and goods, in one integrated system described by Eurostat. (NACE and ISIC: how the two classifications relate)

• How is ISIC used in national classifications?

  Most countries use ISIC directly or derive a national classification from it, and the national version adds detail below the levels shared with ISIC. (NACE and ISIC: how the two classifications relate)

• What is ISIC Revision 4?

  ISIC Rev 4 was the version in use since 2008, replaced as the international standard by ISIC Rev 5, and it remains the basis of many datasets. (NACE and ISIC: how the two classifications relate)

• What is ISIC Revision 5 and when was it endorsed?

  ISIC Rev 5 structure was endorsed in March 2023 and its introduction and explanatory notes in March 2024, and the Division lists it as operational. (NACE and ISIC: how the two classifications relate)

• What does same at the top, more detail below mean?

  NACE and ISIC share the same items at the highest levels, while NACE adds detail at group and class level for European use. (NACE and ISIC: how the two classifications relate)

• How do the ISIC Rev 5 and NACE Rev 2.1 structures compare?

  ISIC Rev 5 and NACE Rev 2.1 match at section and division level and differ at group and class level, because NACE adds European detail. (NACE and ISIC: how the two classifications relate)

• What is ISIC?

  ISIC is the United Nations classification of economic activities, the international standard from which national and regional classifications are derived. (NACE and ISIC: how the two classifications relate)

• What does ISIC not decide?

  ISIC is a statistical classification only. It does not determine a code, a licence, a tax position, or eligibility for any reader. (NACE and ISIC: how the two classifications relate)

• How is the ISIC version used in a dataset identified?

  A dataset's ISIC version is identified from its metadata and its reference period, because Rev 4 and Rev 5 datasets coexist during the transition. (NACE and ISIC: how the two classifications relate)

• How do Italian statistics move to ATECO 2025?

  How Italian statistics move to ATECO 2025, domain by domain, under the European timetable. (Italy: ATECO 2025)

• How do the ATECO correspondence tables work?

  How the ATECO correspondence tables work, including the bidirectional table and the operational reclassification table. (Italy: ATECO 2025)

• How does mass reclassification work in Italy?

  How mass reclassification to ATECO 2025 works in Italy, and what the operational table does and does not do. (Italy: ATECO 2025)

• How does the section letter shift work in Italy?

  How the section letter shift from the split of the old Section J works in ATECO 2025, and how to read Italian codes across it. (Italy: ATECO 2025)

• How is Istat asked about ATECO 2025?

  How Istat is asked about ATECO 2025, what information to have ready, and what Istat can and cannot answer. (Italy: ATECO 2025)

• How is a proposed ATECO code confirmed?

  How a proposed ATECO 2025 code is confirmed or not confirmed in the Istat portal, and who the process covers. (Italy: ATECO 2025)

• How is an ATECO code searched for?

  How an ATECO code is searched for in the Istat interactive systems, and how search results are tested. (Italy: ATECO 2025)

• What are the two ATECO 2025 dates?

  What the two ATECO 2025 dates are, and what each date governs. (Italy: ATECO 2025)

• What does an ATECO code not decide?

  What an ATECO code does not decide, and why other bodies rules govern the questions readers often attach to the code. (Italy: ATECO 2025)

• What does ATECO 2025 publish?

  What Istat publishes for ATECO 2025, including structure, notes, tables and search systems, and where each part is found. (Italy: ATECO 2025)

• What happened to trade and intermediation in Italy?

  What happened to trade and intermediation headings in ATECO 2025, following the European changes. (Italy: ATECO 2025)

• What is ATECO 2025?

  What ATECO 2025 is, who is responsible for it, and how it relates to NACE Rev. 2.1. (Italy: ATECO 2025)

• How does a merge differ from a split?

  How a merge differs from a split in a correspondence table, and why the two patterns need opposite checks. (Classes merged or renamed in NACE Rev. 2.1)

• How is a many to one row read?

  How a many to one row in a correspondence table is read, and what check follows from it. (Classes merged or renamed in NACE Rev. 2.1)

• How is an old class traced to its new place?

  How an old class is traced to its new place through the correspondence table, the explanatory notes and the institute record. (Classes merged or renamed in NACE Rev. 2.1)

• How was electricity production restructured?

  How electricity production classes were restructured in NACE Rev. 2.1 around renewable and non renewable sources. (Classes merged or renamed in NACE Rev. 2.1)

• How were waste and passenger transport restructured?

  How Division 38 for waste and Division 49 for land transport were restructured in NACE Rev. 2.1. (Classes merged or renamed in NACE Rev. 2.1)

• What changed for intermediation activities?

  What changed for intermediation activities in NACE Rev. 2.1, and how the new classes relate to the old groupings. (Classes merged or renamed in NACE Rev. 2.1)

• What happened to Division 45 in NACE Rev. 2.1?

  What happened to Division 45 in NACE Rev. 2.1, and where its activities sit in the new structure. (Classes merged or renamed in NACE Rev. 2.1)

• What happened to Section J in NACE Rev. 2.1?

  What happened to the old Section J in NACE Rev. 2.1, and how the split changed the letters that follow. (Classes merged or renamed in NACE Rev. 2.1)

• What is a merge in a correspondence table?

  What a merge is in a correspondence table, and how a many to one row is read. (Classes merged or renamed in NACE Rev. 2.1)

• What is a rename in NACE Rev. 2.1?

  What a rename is in NACE Rev. 2.1, and how a changed title with unchanged content is recognised. (Classes merged or renamed in NACE Rev. 2.1)

• What is renumbering without a content change?

  What renumbering without a content change is, and why a new identifier does not always mean a new meaning. (Classes merged or renamed in NACE Rev. 2.1)

• Why did the sales channel distinction end?

  Why the distinction between online and in store retail ended in NACE Rev. 2.1, and how retail is grouped now. (Classes merged or renamed in NACE Rev. 2.1)

• What are the new intermediation classes in retail and accommodation?

  What new intermediation classes were created for retail sale, accommodation and food services in NACE Rev. 2.1, and how they sit in their divisions. (Classes created in NACE Rev. 2.1)

• What are the new intermediation classes in transport, postal and telecommunication?

  What new intermediation classes were created for transport, postal and courier, and telecommunication in NACE Rev. 2.1. (Classes created in NACE Rev. 2.1)

• What are the new waste recovery classes 38.21, 38.22 and 38.23?

  What new waste recovery classes 38.21, 38.22 and 38.23 were created in NACE Rev. 2.1, and how groups 38.2 and 38.3 divide recovery from disposal. (Classes created in NACE Rev. 2.1)

• What is class 03.30, support activities for fishing and aquaculture?

  What class 03.30, support activities for fishing and aquaculture, is, and how its new group 03.3 was created in NACE Rev. 2.1. (Classes created in NACE Rev. 2.1)

• What is class 28.97, manufacture of additive manufacturing machinery?

  What class 28.97, manufacture of additive manufacturing machinery, includes, and how its creation changed the machinery grouping. (Classes created in NACE Rev. 2.1)

• What is class 30.13, building of military ships and vessels?

  What class 30.13, building of military ships and vessels, includes and excludes in the explanatory notes. (Classes created in NACE Rev. 2.1)

• What is class 35.11, production of electricity from non renewable sources?

  What class 35.11, production of electricity from non renewable sources, includes and excludes in the explanatory notes. (Classes created in NACE Rev. 2.1)

• What is class 35.12, production of electricity from renewable sources?

  What class 35.12, production of electricity from renewable sources, includes and excludes in the explanatory notes. (Classes created in NACE Rev. 2.1)

• What is class 35.16, storage of electricity?

  What class 35.16, storage of electricity, includes and excludes in the explanatory notes. (Classes created in NACE Rev. 2.1)

• What is class 35.24, storage of gas as part of network supply services?

  What class 35.24, storage of gas as part of network supply services, includes and excludes in the explanatory notes. (Classes created in NACE Rev. 2.1)

• What is class 63.10, computing infrastructure, data processing, hosting and related activities?

  What class 63.10, computing infrastructure, data processing, hosting and related activities, includes and excludes in the explanatory notes. (Classes created in NACE Rev. 2.1)

• What is group 60.3, news agency and other content distribution activities?

  What group 60.3, news agency and other content distribution activities, contains, and how its new class 60.39 was created. (Classes created in NACE Rev. 2.1)

• Austria: what does Statistics Austria publish for ONACE 2025?

  What Statistics Austria publishes for ONACE 2025, and what was not verified about its timetable. (Other national variants)

• Belgium: what do Statbel and the CBE show for NACE-BEL 2025?

  What Statbel and the Crossroads Bank for Enterprises show for NACE-BEL 2025, and how the conversion appears on a register record. (Other national variants)

• How do national fifth levels differ?

  How national fifth levels differ between countries, and why a fifth level heading must never be compared across borders. (Other national variants)

• How are two national variants compared?

  How two national variants are compared at the shared levels, and what must never be compared at national level. (Other national variants)

• How is a national timetable tracked?

  How a national timetable is tracked from the institute that publishes it, and how an unchecked timetable is reported. (Other national variants)

• Ireland: what does the CSO publish for NACE Rev. 2.1?

  What the Central Statistics Office publishes for NACE Rev. 2.1, including its Business Register work and its gradual implementation. (Other national variants)

• Netherlands: what does CBS publish for SBI 2025?

  What Statistics Netherlands publishes for SBI 2025, including its five levels, its gradual implementation, and the role of KVK. (Other national variants)

• Poland: how is the current PKD position checked?

  How the current PKD position is checked with GUS and the Polish registers, where no timetable was verified against the institute. (Other national variants)

• Portugal: what does INE publish for CAE Rev. 4?

  What Statistics Portugal publishes for CAE Rev. 4, and what was not verified about its timetable. (Other national variants)

• Romania: what does the National Institute of Statistics publish for CAEN Rev. 3?

  What the Romanian National Institute of Statistics publishes for CAEN Rev. 3, and how its statistical timetable runs. (Other national variants)

• Slovenia: what does SURS publish for SKD 2025?

  What the Statistical Office of the Republic of Slovenia publishes for SKD 2025, including its subclasses and its gradual statistical transition. (Other national variants)

• Spain: what does INE publish for CNAE-2025?

  What the Spanish National Statistics Institute publishes for CNAE-2025, including its structure, its consultations, and its implementation. (Other national variants)

• How are horizontally integrated activities treated?

  How horizontally integrated activities are treated in NACE Rev. 2.1, and why gross output or turnover is the usual substitute. (Principal activity and secondary activities)

• How are vertically integrated activities treated?

  How vertically integrated activities are treated in NACE Rev. 2.1, and what happens when value added cannot be split between stages. (Principal activity and secondary activities)

• How does the top down method work?

  How the top down method identifies a principal activity in stages, and the worked example in the NACE Rev. 2.1 manual. (Principal activity and secondary activities)

• How is the top down method adapted for wholesale and retail trade?

  How the top down method is adapted for division 46 wholesale trade and division 47 retail trade, including specialised and non specialised trade. (Principal activity and secondary activities)

• How is value added used to identify a principal activity?

  How gross value added at basic prices identifies a principal activity in NACE Rev. 2.1, and what the measure includes. (Principal activity and secondary activities)

• What does a principal activity classification not decide?

  What a principal activity classification does not decide, and why the statistical entry must not be read as eligibility or status. (Principal activity and secondary activities)

• What happens when no single activity reaches half of value added?

  What the introductory guidelines say when no activity reaches half of value added, and when the top down method is required. (Principal activity and secondary activities)

• What is a principal activity?

  What a principal activity is in NACE Rev. 2.1, how value added identifies it, and what it does not decide. (Principal activity and secondary activities)

• What is a secondary activity?

  What a secondary activity is in NACE Rev. 2.1, how it differs from a principal activity, and how it is recorded. (Principal activity and secondary activities)

• What is an ancillary activity?

  What an ancillary activity is in NACE Rev. 2.1, the four conditions it must meet, and what is not ancillary. (Principal activity and secondary activities)

• What is the stability rule?

  What the stability rule in the introductory guidelines does, why frequent changes are avoided, and how often a classification changes. (Principal activity and secondary activities)

• What substitutes are used when value added is unknown?

  What substitute criteria the introductory guidelines allow when value added is unknown, and the cautions on each substitute. (Principal activity and secondary activities)

• How are aggregated codes read in tables?

  Aggregated codes show totals for a section, division or named grouping, and they hide movement inside the aggregate. (Reading NACE codes in registers, datasets and listings)

• How are code formats, punctuation and spacing read?

  Code formats use letters and digits in fixed positions, with dots and spaces as presentation, and the format must be copied exactly as shown. (Reading NACE codes in registers, datasets and listings)

• What does a code shown without its note prove?

  A code without its explanatory note shows a category label only. The note, the version, and the holder are needed before it can be relied on. (Reading NACE codes in registers, datasets and listings)

• How are codes shown in company listings?

  A company listing shows a code as one attribute among others, copied from a register or supplied by the company, and it must be verified with the register. (Reading NACE codes in registers, datasets and listings)

• How are codes read in PDF reports?

  A PDF report shows codes with a publication date and a version, and the report must be checked for both before a code in it is quoted. (Reading NACE codes in registers, datasets and listings)

• How are two sources cross checked for the same code?

  Two sources are cross checked by comparing version, unit, date and code in that order, and a difference is recorded, not resolved by preference. (Reading NACE codes in registers, datasets and listings)

• How are codes shown in dataset tables?

  Dataset tables show codes as breakdowns with metadata stating version, reference period and unit, and a table without that metadata cannot be compared. (Reading NACE codes in registers, datasets and listings)

• What does a missing or blank code mean?

  A missing or blank code means no code was published in that place. It does not prove no activity, no registration, or no code held elsewhere. (Reading NACE codes in registers, datasets and listings)

• What does a new code in an old listing mean?

  A new code in an old listing usually means the listing was updated in its codes, or the code was backcast, and the record date must be checked. (Reading NACE codes in registers, datasets and listings)

• What does an old code in a new listing mean?

  An old code in a new listing usually means the listing has not been recoded, and the version must be checked before the code is used. (Reading NACE codes in registers, datasets and listings)

• What fields appear with a code in a register entry?

  A register entry shows the identifier, the code, the label, and the version together, and each field must be recorded with the code. (Reading NACE codes in registers, datasets and listings)

• How is the section letter shift read in a listing?

  The J and K split shifted later section letters by one, so a letter must be read with the version stated, or it will be misread. (Reading NACE codes in registers, datasets and listings)

• What is the difference between a business register and a statistical business register?

  A business register holds legal and administrative records, while a statistical business register frames business statistics, and the two can hold different views of the same unit. (Registers and institutes where a code is confirmed)

• How is a code checked in a dataset?

  A dataset code is checked through its metadata: version, reference period, unit, and any break or backcast note. (Registers and institutes where a code is confirmed)

• How is a register entry corrected?

  A correction is requested from the holder of the record, through that holder's route, and the holder decides it; no correction is made by self determination. (Registers and institutes where a code is confirmed)

• What is ShowVoc and how is it used to check a classification?

  ShowVoc is Eurostat's online platform for classifications, presenting NACE Rev 2.1 in human readable and machine readable formats. (Registers and institutes where a code is confirmed)

• How is a French code confirmed in Sirene and with INSEE?

  In France the APE code is viewed in the Sirene directory, the SIREN number is the key, and a rectification can be requested before 1 January 2027. (Registers and institutes where a code is confirmed)

• Is a code confirmed by the institute or by the register?

  The institute holds the classification and the register holds the entry, so meaning and entry are confirmed in different places. (Registers and institutes where a code is confirmed)

• How is an Irish code confirmed with the Central Statistics Office?

  Ireland's CSO Business Register completed updating enterprise coding to NACE Rev 2.1 during 2025, and CSO outputs move gradually from January 2026. (Registers and institutes where a code is confirmed)

• How is a record of a code check kept?

  A check record keeps the register, identifier, code, version and check date together, so the check can be repeated and the entry can be rechecked after a recoding. (Registers and institutes where a code is confirmed)

• How is a Dutch code confirmed with the KVK and Statistics Netherlands?

  In the Netherlands the KVK assigns the SBI code in the Business Register and Statistics Netherlands uses the SBI in statistics, with SBI 2025 phased in from 2026. (Registers and institutes where a code is confirmed)

• How is a United Kingdom code confirmed with the ONS and Companies House?

  The ONS holds UK SIC 2007, identical to NACE to four digits, and the company record is the place to confirm the entry shown for a company. (Registers and institutes where a code is confirmed)

• What does a register entry not prove?

  A register entry proves what the register holds at the check date. It does not prove activity, licence, tax position, or status. (Registers and institutes where a code is confirmed)

• What should be asked when confirming a code?

  Confirming a code means asking for the code, the version, the unit, and the date, and recording all four together. (Registers and institutes where a code is confirmed)

• How do you read a regulation citation for NACE?

  How to read OJ references, CELEX numbers, regulation numbers, and dates in NACE citations without mixing instruments. (The regulation behind NACE Rev. 2.1)

• How was Rev. 2.1 reviewed and validated?

  The 2018 review launch, the task force and Standards Working Group steps, and the May 2022 validation. (The regulation behind NACE Rev. 2.1)

• What does Article 4 say about national versions?

  The approval step for national versions, the fifth digit pattern, and the framework a national version must fit. (The regulation behind NACE Rev. 2.1)

• What came before NACE Rev. 2?

  The earlier NACE versions from 1970 onward, the Rev. 1 and Rev. 1.1 steps, and the Rev. 2 starting point. (The regulation behind NACE Rev. 2.1)

• What does the consolidated text show?

  What a consolidated version of Regulation (EC) No 1893/2006 shows, its documentary value note, and what it does not replace. (The regulation behind NACE Rev. 2.1)

• What does Delegated Regulation (EU) 2023/137 do?

  What Delegated Regulation (EU) 2023/137 amends, what NACE Rev. 2.1 it specifies, and which dates it fixes. (The regulation behind NACE Rev. 2.1)

• What does mandatory use in the EEA mean?

  Mandatory use of NACE in the European Economic Area, the derived national version rule, and the collection limit. (The regulation behind NACE Rev. 2.1)

• What NACE Rev. 2.1 is

  What NACE Rev. 2.1 is, how its four levels fit together, and which dates are fixed. (The regulation behind NACE Rev. 2.1)

• What does Regulation (EC) No 1893/2006 do?

  What Regulation (EC) No 1893/2006 establishes, who must use the classification it sets, and where its scope ends. (The regulation behind NACE Rev. 2.1)

• What does statistical purposes only mean?

  What the statistical purposes limit in the summary means for statistics, registers, and the reading of a code. (The regulation behind NACE Rev. 2.1)

• When does NACE Rev. 2.1 apply to data transmission?

  The staggered data transmission range, why it varies by statistical domain, and how to check one domain. (The regulation behind NACE Rev. 2.1)

• Who implements NACE and who chairs the committee?

  The European Statistical System Committee role in implementing NACE, its chair, and the interpretation work it handles. (The regulation behind NACE Rev. 2.1)

• Why do two instruments set one classification?

  Why Regulation (EC) No 1893/2006 and Delegated Regulation (EU) 2023/137 work as base text and amendment, and how to read them together. (The regulation behind NACE Rev. 2.1)

• How did later sections shift one letter?

  The one letter shift for sections after the J split, the Table 4 comparison, and the renaming inside the shift. (What changed from NACE Rev. 2 to NACE Rev. 2.1)

• What changed for intermediation service activities?

  The new intermediation classes created across divisions, what intermediation means in the manual, and where the classes sit. (What changed from NACE Rev. 2 to NACE Rev. 2.1)

• What changed in energy waste and construction?

  The electricity, waste and construction restructurings in Sections D, E and F, including new storage and recovery classes. (What changed from NACE Rev. 2 to NACE Rev. 2.1)

• What changed in finance real estate and professional services?

  The finance, real estate and professional service changes, including holding company splits, design splits and group moves. (What changed from NACE Rev. 2 to NACE Rev. 2.1)

• What changed in health education arts and personal services?

  The education, health, arts and personal service restructurings, from new health classes to the division 96 promotion. (What changed from NACE Rev. 2 to NACE Rev. 2.1)

• What changed in manufacturing divisions?

  The major manufacturing changes listed in the manual, from wearing apparel and wood to furniture and machinery classes. (What changed from NACE Rev. 2 to NACE Rev. 2.1)

• What changed in trade divisions 46 and 47?

  The elimination of the online and in store distinction, the division 45 moves, and the trade class mergers. (What changed from NACE Rev. 2 to NACE Rev. 2.1)

• What counts as a major change and what counts as minor?

  The manual definition of major changes, the examples of minor changes, and why a minor change still needs a note check. (What changed from NACE Rev. 2 to NACE Rev. 2.1)

• What happened to division 45?

  The elimination of division 45, where its wholesale, retail and repair activities moved, and why the number is now unused. (What changed from NACE Rev. 2 to NACE Rev. 2.1)

• What is the overall change in numbers?

  The net change from 21 sections and 615 classes to 22 sections and 651 classes, and what the net figures hide. (What changed from NACE Rev. 2 to NACE Rev. 2.1)

• What stayed the same in Rev. 2.1?

  The structure and characteristics maintained through Update 1, the sections with no major change, and the limits of that stability. (What changed from NACE Rev. 2 to NACE Rev. 2.1)

• Why did Section J split into J and K?

  The split of former Section J into publishing and telecommunication sections, and which divisions each new section holds. (What changed from NACE Rev. 2 to NACE Rev. 2.1)

• How did the lettering of later sections change?

  How the section letters after K shifted by one letter in NACE Rev. 2.1, and why a letter without a version is ambiguous. (The split of the old Section J)

• How does the Section J split appear in a correspondence table?

  How the Section J split appears in a correspondence table, the four correspondence types, and why a table does not pick a new code. (The split of the old Section J)

• What does the new Section J cover?

  What the new Section J in NACE Rev. 2.1 covers, which divisions it contains, and where its boundary sits. (The split of the old Section J)

• What does the new Section K cover?

  What the new Section K in NACE Rev. 2.1 covers, which divisions it contains, and where its boundary sits. (The split of the old Section J)

• What does the split mean for reading an old Section J code?

  What the Section J split means for reading an old Section J code, and the checks that must come before the code is restated. (The split of the old Section J)

• What happened to division 61, telecommunication?

  What happened to division 61 in NACE Rev. 2.1, how three groups became one group, and what the merger does not change. (The split of the old Section J)

• What happened to division 62, computer programming and consultancy?

  What happened to division 62 in NACE Rev. 2.1, how its classes became groups, and where cybersecurity work sits. (The split of the old Section J)

• What happened to division 63, information services?

  What happened to division 63 in NACE Rev. 2.1, how groups 63.1 and 63.9 were created, and what moved out. (The split of the old Section J)

• Where did cybersecurity activities go in NACE Rev. 2.1?

  Where cybersecurity activities sit in NACE Rev. 2.1, why there is no standalone cybersecurity class, and which notes to read. (The split of the old Section J)

• Which activities moved into Section J from division 63?

  Which activities moved from division 63 into the new Section J, and how the new group 60.3 records the move. (The split of the old Section J)

• Which activities remained in Section K from division 63?

  Which activities from division 63 remained in the new Section K, and how groups 63.1 and 63.9 hold them. (The split of the old Section J)

• Why was the former Section J split?

  Why the former Section J was split into two sections in NACE Rev. 2.1, and what the review behind the split set out to do. (The split of the old Section J)

• How did class 16.23 split?

  How class 16.23 split into classes 16.23 and 16.25 in NACE Rev. 2.1, separating doors and windows of wood. (Classes that split in manufacturing)

• How did class 16.29 split?

  How class 16.29 split into classes 16.26, 16.27 and 16.28 in NACE Rev. 2.1, and how the split is shown. (Classes that split in manufacturing)

• How did class 20.59 split and absorb other classes?

  How class 20.59 split to create class 20.51 for liquid biofuels, and absorbed the old classes for explosives, glues and essential oils. (Classes that split in manufacturing)

• How did class 22.23 split?

  How class 22.23 split into classes 22.23, 22.24 and 22.25 in NACE Rev. 2.1, separating doors, builders ware and finishing. (Classes that split in manufacturing)

• How did group 16.1 split?

  How group 16.1, sawmilling and planing of wood, split into classes 16.11 and 16.12 in NACE Rev. 2.1. (Classes that split in manufacturing)

• How is a manufacturing split shown in the correspondence table?

  How a manufacturing split is shown in the correspondence table, using class 16.29 as an illustration of the table structure. (Classes that split in manufacturing)

• How was division 14, wearing apparel, restructured?

  How division 14, manufacture of wearing apparel, was restructured in NACE Rev. 2.1, with two new groups replacing three old groups. (Classes that split in manufacturing)

• How were classes 25.21 and 25.30 merged?

  How classes 25.21 and 25.30 merged into a new class 25.21 in NACE Rev. 2.1, and how group 25.6 was restructured. (Classes that split in manufacturing)

• What does class 16.26 cover?

  What class 16.26, manufacture of solid fuels from vegetable biomass, includes and excludes in the explanatory notes. (Classes that split in manufacturing)

• What does class 16.27 cover?

  What class 16.27, finishing of wooden products, includes and excludes in the explanatory notes. (Classes that split in manufacturing)

• What does class 16.28 cover?

  What class 16.28, manufacture of other products of wood and articles of cork, straw and plaiting materials, includes and excludes. (Classes that split in manufacturing)

• What new manufacturing classes were created in divisions 28 and 30?

  What new classes were created in divisions 28 and 30 in NACE Rev. 2.1, including additive manufacturing machinery and military classes. (Classes that split in manufacturing)

• How did class 74.90 split?

  How class 74.90, other professional, scientific and technical activities, split into classes 74.91 and 74.99 in NACE Rev. 2.1. (Classes that split in services)

• How did group 49.1 split?

  How group 49.1, passenger rail transport, interurban, split into classes 49.11 and 49.12 in NACE Rev. 2.1. (Classes that split in services)

• How did group 56.1 split?

  How group 56.1, restaurants and mobile food service activities, split into classes 56.11 and 56.12 in NACE Rev. 2.1. (Classes that split in services)

• How did group 64.2 split?

  How group 64.2, activities of holding companies and financing conduits, split into classes 64.21 and 64.22 in NACE Rev. 2.1. (Classes that split in services)

• How did group 64.3 split?

  How group 64.3, trusts, funds and similar financial entities, split into classes 64.31 and 64.32 in NACE Rev. 2.1. (Classes that split in services)

• How did group 74.1 split into four design classes?

  How group 74.1, specialised design activities, split into four new classes 74.11 to 74.14 in NACE Rev. 2.1. (Classes that split in services)

• How did group 86.9 split?

  How group 86.9, other human health activities, split into eight classes 86.91 to 86.97 and 86.99 in NACE Rev. 2.1. (Classes that split in services)

• How do service splits differ from renaming, merging and restructuring?

  How a split differs from a renaming, a merger and a restructuring in NACE Rev. 2.1, with service examples of each change type. (Classes that split in services)

• How was division 90, arts, restructured?

  How division 90, arts creation and performing arts, was restructured into groups 90.1, 90.2 and 90.3 in NACE Rev. 2.1. (Classes that split in services)

• How was division 91, cultural activities, restructured?

  How division 91, libraries, archives, museums and other cultural activities, was restructured into groups 91.1 to 91.4 in NACE Rev. 2.1. (Classes that split in services)

• How was division 96, personal services, restructured?

  How division 96, other personal service activities, was restructured into groups 96.1 to 96.4 and 96.9 in NACE Rev. 2.1. (Classes that split in services)

• How was group 49.3 restructured?

  How group 49.3, other passenger land transport, was restructured with new classes 49.31, 49.32 and 49.34 in NACE Rev. 2.1. (Classes that split in services)

• What is backcasting in the NACE Rev 2.1 transition?

  Backcasting restates earlier statistics on the NACE Rev 2.1 basis so historical series stay comparable, using the methods in the Eurostat backcasting manual. (Transition timetable by domain and country)

• When do balance of payments, trade in services and investment statistics move?

  Balance of payments, international trade in services and foreign direct investment are listed by Eurostat with updated requirements in Delegated Regulation 2024/3104, with no single date verified. (Transition timetable by domain and country)

• When is NACE Rev 2.1 used in bank reporting?

  Eurostat records a Joint Banking Reporting Committee recommendation for harmonised NACE Rev 2.1 bank reporting from 1 January 2026 onwards. (Transition timetable by domain and country)

• Which countries have no published NACE Rev 2.1 timetable?

  For Germany, Italy, Portugal, Romania and other countries, no national timetable date was verified in the pages consulted, and no date is asserted here. (Transition timetable by domain and country)

• What is double reporting in the transition?

  Double reporting sends the same statistics broken down by NACE Rev 2 and by NACE Rev 2.1 in parallel for a period, as described on the Eurostat transition page. (Transition timetable by domain and country)

• When do economic accounts for agriculture move to NACE Rev 2.1?

  Economic accounts for agriculture are listed by Eurostat among the domains with updated transmission requirements, with no single application date verified. (Transition timetable by domain and country)

• When do environmental economic accounts move to NACE Rev 2.1?

  Environmental economic accounts are listed by Eurostat with updated requirements in Delegated Regulation 2025/472, with no single application date verified. (Transition timetable by domain and country)

• What is the European data transmission range?

  The FIXED range for NACE Rev 2.1 data transmission, why it is a range, and what it does not fix for a single domain. (Transition timetable by domain and country)

• When do European business statistics move to NACE Rev 2.1?

  Short term business statistics use NACE Rev 2 until the end of 2027 and NACE Rev 2.1 from 2028, on the Eurostat legislation page. (Transition timetable by domain and country)

• What are the French, Irish and Dutch timetables?

  France moves to NAF 2025 from 1 January 2027, Ireland begins publishing on NACE Rev 2.1 from January 2026, and the Netherlands implements SBI 2025 gradually from 2026. (Transition timetable by domain and country)

• How is the transition timetable read?

  How to read a NACE Rev 2.1 timetable, what FIXED and EXPECTED mean, and which timetable controls a given statistic. (Transition timetable by domain and country)

• What timetable applies to other statistical domains?

  Other statistical domains are covered by Commission Regulation 2025/447 on the Eurostat transition page, with no single application date verified. (Transition timetable by domain and country)