Tax identification number: 2026 guide

Updated March 2026 - The term tax identification number is often used to designate several different realities: personal tax number, TIN, individual VAT identification number, or sometimes by mistake the SIREN or SIRET. In 2026, this confusion could cost time, block an intra-community operation or complicate a compliance file. It is therefore necessary to put each identifier back in its correct place.

For a natural person

The personal tax number identifies the taxpayer in his relations with the French tax administration. It appears on tax notices and in the personal space.

For a business

Depending on the situation, the company may need to use:

• ▸their professional tax number in the DGFiP area;
• ▸an intra-community VAT number;
• ▸a TIN in the sense of international trade;
• ▸and of course their INSEE identifiers, which are not tax numbers in the strict sense.

Common error: confusing SIREN and tax identifier

The SIREN and SIRET are used for the administrative identification of the company, but they do not always replace the number requested by the administration or by an intra-community partner.

To understand the practical impacts, also consult our article on VAT group, our guide on online tax question and our file on EORI number in 2026.

When is it needed

The individual VAT identification number becomes essential when the company enters into certain operations or obligations:

• ▸intra-community acquisitions;
• ▸provision of services with self-liquidation;
• ▸operations requiring a VAT declaration or summary statements;
• ▸belonging to a single taxable person.

Why it should be checked before an operation

A wrong VAT number can result in:

• ▸an invoice rejection;
• ▸incorrect treatment of VAT;
• ▸a blocking of declaration;
• ▸a difficulty in deduction.

What is it for

The TIN, in the sense of international taxation and automatic exchange of information, is used to identify a taxpayer or an entity in a given State.

Why it matters in 2026

Banks, platforms and partners can request:

• ▸the country of tax residence;
• ▸the corresponding NIF;
• ▸supporting documents relating to resident status.

Hayot Expertise Advice: before transmitting a tax identifier to a foreign partner, always check whether you are asked for a personal tax number, an intra-community VAT number or a TIN in the international sense. The three are not interchangeable.

For individuals

The tax number can be found in particular on:

• ▸the tax notice;
• ▸the income tax return;
• ▸the impots.gouv.fr personal space.

For professionals

The company must refer to:

• ▸to their professional space;
• ▸to its SIE;
• ▸his VAT identification certificate if the operation requires it.

Intra-community billing

An intra-community service with a wrong number may call into question:

• ▸the mention of reverse liquidation;
• ▸the DES;
• ▸the consistency of VAT declarations.

VAT and electronic invoicing group

With the single taxable person, the question of identifiers becomes even more sensitive. Invoices must be able to correctly relate:

• ▸the single taxable person;
• ▸the member concerned;
• ▸the proper nature of the operation.

A simple upstream check avoids invoice corrections, VAT anomalies and unnecessary exchanges with the administration.

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Formalize an identification form

Each company should keep an internal file which summarizes:

• ▸SIREN;
• ▸SIRET;
• ▸tax number;
• ▸VAT number;
• ▸country of tax residence;
• ▸DGFiP contacts.

Update tools

Make sure to align the identifiers in:

• ▸the ERP;
• ▸invoicing software;
• ▸quote models;
• ▸supplier and customer databases.

The tax identification number is not a universal unique identifier. In 2026, it is necessary to clearly distinguish between the tax number, the international NIF and the intra-community VAT number. This clarification avoids invoicing errors, reporting anomalies and blockages with foreign partners or the administration.

📞 Are you unsure about which tax ID to use? Our firm can check your numbers, your obligations and your intra-community flows. Make an appointment with an expert

(Official sources: impots.gouv.fr - Where to find the answer to a tax question and online services, BOFiP BOI-TVA-DECLA-20-10-20 relating to the individual VAT identification number, BOFiP relating to the TIN in automatic exchanges of information, European Commission - official information on TIN/NIF by country)