How does mass reclassification work in Italy?

Mass reclassification to ATECO 2025 in Italy works by assigning new codes to large numbers of units at once, using the correspondence tables and the operational reclassification table, where detailed information about each unit’s activity is not available. Istat states that an operational reclassification table was made available to support mass reclassification operations, in the absence of detailed information describing the activity carried out, and that it was developed with the chamber system, mainly for the initial implementation phase by the bodies managing archives.

Mass reclassification is therefore a register operation, carried out by the bodies that hold registers, using a tool designed for that operation. It is not a determination about any individual unit’s activity, and it is not a substitute for the confirmation and correction routes that follow it.

Why is mass reclassification needed?

Mass reclassification is needed because a classification change touches every entry in a register at once. A register that holds entries for a large number of units cannot review each entry individually before the new classification applies, where it holds no detailed description of what each unit does. The operational table gives those bodies a basis for assigning a new code in that situation, using the theoretical correspondence table and the information available to them. Istat states that the operational table is a tool conceived mainly for the initial implementation phase. That phrasing matters: the tool is for the initial phase, when the new classification is first applied to existing entries. It is not presented as the permanent method for assigning codes, and it is not presented as a replacement for checking an entry where detailed information becomes available.

Situation	Tool used	Character of the result
Detailed information available	Theoretical correspondence table and notes	Category link, tested in the note
No detailed information available	Operational reclassification table	Default assignment for the initial phase
Entry checked afterwards	Confirmation and correction routes	Confirmed entry, subject to review

The table above separates the situations by tool and by character of result. A default assignment and a tested link are different kinds of result, and a reader should never cite one as if it were the other.

How does the operational table assign a code?

The operational table assigns a code by giving a default destination for an old heading, where the theoretical table offers more than one destination and the register holder has no information to choose between them. The default is based on the information available to the register holders and on statistical methods, as described by Istat for the portal process, which uses the theoretical correspondence table, the operational table, and statistical methods together. A default assignment is therefore an informed starting point, not a finding about the unit. It lets the register show a new code for every unit from the implementation date, rather than leaving entries blank. It also creates a risk: a unit whose activity differs from the default will show the wrong code until the entry is checked and corrected. That risk is why Istat provides confirmation and correction routes, described in the confirmation guide in this cluster, and why a reader should check an entry rather than assume that a mass assigned code is correct.

What follows mass reclassification?

What follows mass reclassification is confirmation and correction. Istat describes a portal process in which users with credentials can view the prevailing ATECO 2025 code initially assigned, confirm the proposed reclassification, or not confirm it where they consider it inadequate, and then request a change through the reporting channel in the portal. That process is described for users involved in Istat statistical surveys, with credentials, and it is described in the confirmation guide in this cluster. For register entries in general, the bodies that hold registers provide their own routes for checking and correcting entries, and a reader should follow the route stated by the register that holds the entry. Mass reclassification is the beginning of the new entry, not the end of the check. An entry that has not been checked remains a default assignment, however it appears in a listing.

What does mass reclassification not decide?

Mass reclassification does not decide the code for any reader in the sense of determining the correct code, and it does not decide tax, licensing, funding or collective agreement questions. It assigns codes at scale, for statistical and administrative registers, under a published method. The classification remains statistical in character, as the EUR-Lex summary states for the European legislation. For a specific business, Istat or the business register that holds the record is where the entry is confirmed. This site holds no register and decides no entry. A reader who treats a mass assigned code as a confirmed code, without checking it, mistakes a starting point for a conclusion.

Mass reclassification gives every entry a new code for the initial phase, the operational table supplies the default where information is missing, and confirmation and correction routes let an entry be checked afterwards. ”