Whether you’re working, studying, moving to France, or launching a business, you may need several official identification numbers to access public services, manage your tax affairs and comply with administrative requirements. This guide explains the main identifiers you may encounter in France, including the tax ID France, French social security number and business identifiers such as SIREN and SIRET.

📌 Internal Resource: Learn more about legal identifiers such as DINR in France at ESCEC International – DINR France

🔗 External Resource: For additional information about the French TIN, see Expatica – TIN France

Key ID Numbers in France

If you’re moving to France for an extended period, working there, studying or starting a business, several identification numbers may become important in your daily administrative life.

The main ones include:

National registration number (NIR) – commonly called the numéro de sécurité sociale or social security number. It is used to identify you within the French social protection system.
Tax Identification Number (TIN) – commonly referred to in France as the numéro fiscal and associated with the Numéro d’Identification Fiscale (NIF). It is the identifier used for your personal tax affairs.
SIREN/SIRET – business identification numbers used to identify a business and its establishments, including for entrepreneurs and self-employed professionals.

These identifiers serve different purposes and should not be confused with one another.

The French Social Security Number (NIR)

The NIR, or Numéro d’Inscription au Répertoire, is commonly known as the French social security number (numéro de sécurité sociale).

It contains 13 digits, followed by a 2-digit control key. The number is assigned to identify an individual within France’s social security system. It is used for healthcare, social benefits, employment-related procedures and pension rights.

Once your rights are established, the number can appear on documents relating to your health insurance and on your Carte Vitale.

Uses of the NIR

Your French social security number can be used for:

Health insurance and reimbursement through CPAM
Social benefit claims, including procedures involving CAF, France Travail and MDPH
Employee registration and social contribution records
Pension rights
Family benefits
Workplace accident and occupational protection procedures

It is therefore a central identifier for accessing France’s social protection system.

💡 Important: Not having a definitive French social security number does not mean that a foreign worker cannot legally work in France. Depending on the situation, the registration process can take place after arrival and a temporary identification number may be issued while the individual’s rights are being established.

Who Needs a French National Registration Number?

People who work, study or reside in France may need to be registered with the French social security system, depending on their situation and the rules applicable to them.

The process is particularly important for people who are born abroad and are arriving in France, because they generally need to provide documents establishing their identity, civil status and eligibility for French health insurance.

The idea that everyone staying in France for more than 90 days automatically receives a social security number is too broad. Eligibility and registration depend on the person’s circumstances, such as employment, residence and entitlement to French health coverage.

Children can also be registered with the French social security system. Their healthcare rights may be linked to those of a parent, but this does not mean that children simply use a parent’s permanent social security number as their own.

How to Apply for a Social Security Number in France

The procedure depends on your situation.

For Employees

If you are employed in France, your employer participates in the administrative process required to register you with the French social security system.

If you were born abroad and need to obtain a French social security number, documents may include:

Valid identity document
Residence permit or other valid proof of legal stay where applicable
Civil-status documents, such as a birth certificate
Documents required to establish your eligibility for French health insurance

For people born abroad, the Assurance Maladie currently explains that the opening of health insurance rights is an essential first step and may initially result in the assignment of a temporary identification number (NIA) while the definitive registration is completed.

For Self-Employed Professionals

Self-employed workers and professionals may need to complete their social protection registration depending on their activity and status. The relevant administrative process can involve URSSAF, while healthcare rights are handled through the French health insurance system.

For Students

Foreign students have specific procedures for registering with the French healthcare system. The applicable process depends in particular on nationality and existing social security coverage.

Students from the European Union, European Economic Area or Switzerland may, depending on their circumstances, use their European health insurance arrangements while meeting the applicable French registration requirements.

For Retirees and Non-Workers

Retirees and people who are not working may still have healthcare rights in France, depending on their residence and personal circumstances.

They may need to contact the relevant CPAM or, depending on their pension situation, other competent French social protection institutions.

Tax ID France: The French Tax Identification Number (TIN)

The tax ID France is commonly known as your numéro fiscal. It is the personal identifier used by the French tax administration for your tax affairs.

For individuals, the French tax number is a 13-digit identifier. It is used for interactions with the French tax administration and to access your personal tax account on impots.gouv.fr.

You may also see the terms:

Tax Identification Number (TIN)
NIF
Numéro d’identification fiscale
Numéro fiscal

These terms are commonly used when discussing French tax identification, particularly in international tax and banking contexts.

Why Is a French Tax ID Important?

Your tax ID France is particularly important when dealing with the French tax administration.

It allows you to:

File and manage your income tax obligations
Access your personal tax account
Manage tax returns
View tax notices
Handle property-related tax matters
Communicate with the French tax administration
Complete certain international tax and administrative procedures

Your 13-digit tax number is the unique identifier used for your personal tax procedures and is shown on important tax documents such as your income tax return and tax notices.

What Does the French Tax Office Know About You?

When you have tax obligations in France and submit information to the French tax administration, its records can contain information relevant to your tax situation.

Depending on your circumstances and declarations, this can include:

Salary and employer information
Property ownership and rental income
Banking information reported under applicable rules
Family situation
Benefits and tax-related information
Other declared income and assets

The information held by the tax administration depends on what you are required to declare and the information transmitted to the French authorities.

When and How Do You Use Your French TIN?

Your French tax number is primarily used for tax-related procedures.

It is not simply a general identification number for every administrative procedure in France. For example, opening a bank account or purchasing property does not automatically mean that the tax number itself is the identifier used for the entire transaction.

However, once you have French tax obligations, your numéro fiscal becomes essential for dealing with the tax administration.

You can use it to access your personal account on impots.gouv.fr and manage your tax affairs online.

Who Needs a Tax ID in France?

People who have tax obligations in France may need a French tax identification number.

However, it is more accurate to say that the tax number is associated with your relationship with the French tax administration rather than claiming that every person earning any income in France automatically needs a TIN before doing anything else.

For people who become subject to French tax procedures, obtaining and keeping their tax number is essential because it allows the administration to identify their tax file.

How to Get a Tax ID in France

For many taxpayers, the tax number is assigned through the French tax administration when their tax file is created. It can then be found on official tax documents, including tax returns and tax notices.

If you already have a tax number, you can use it to create or access your personal account on impots.gouv.fr.

If you do not yet have a tax number, the procedure is different. The French tax administration states that creating an online personal account without a tax number generally requires an initial tax procedure, including the submission of a first income tax return in the applicable circumstances.

You may also need to contact your Centre des Finances publiques if your situation requires identity verification or if you need assistance obtaining your number.

If you already have a tax number

Go to impots.gouv.fr
Access « Connexion ou création de votre espace ».
Enter your 13-digit tax number.
Follow the instructions displayed for your situation.
Use your personal account to manage your tax procedures.

If you have lost your tax number, the French tax administration also provides an online recovery procedure using information such as your email address and date of birth.

Business ID Numbers in France

If you’re setting up a business, becoming self-employed or registering a professional activity in France, you will encounter business identifiers such as the SIREN and SIRET.

These identifiers are different from your personal tax ID and social security number.

SIREN

The SIREN is a 9-digit identifier assigned to a legal unit.

It identifies the business or individual entrepreneur as a unit within the French SIRENE system. The SIREN remains associated with that unit throughout its existence and is not reused for another entity.

SIRET

The SIRET is a 14-digit establishment identifier.

It consists of:

The 9-digit SIREN
A 5-digit NIC (Numéro Interne de Classement) identifying the establishment

The SIRET therefore identifies a particular establishment or place of activity belonging to the business.

If a business has several establishments, each establishment can have its own SIRET while sharing the same SIREN.

The SIRET is linked to the establishment’s location, which means it can change when an establishment moves or when its establishment information changes.

These business identifiers can appear on invoices, contracts, administrative documents and other official business documentation, depending on the applicable requirements.

Tax ID France vs. Social Security Number vs. SIREN/SIRET

These identifiers have completely different purposes:

Identifier	Purpose	Typical length
NIR / Social Security Number	Healthcare and French social protection	13 digits + 2-digit key
Tax ID / Numéro fiscal / NIF	Personal tax administration	13 digits
SIREN	Identifies a legal unit/business	9 digits
SIRET	Identifies a specific establishment	14 digits

Understanding the difference is important, particularly for foreigners moving to France, international founders, freelancers and expatriates. Having one identifier does not automatically replace the others.

Resources to Help You Get Started

Ameli.fr

Ameli.fr — Information about healthcare rights, the French social security number and the registration process.

Impots.gouv.fr

Impots.gouv.fr — Official French tax administration website for tax returns, tax notices, your personal tax account and your tax ID France.

Service-Public.fr

Service-Public.fr — Official information about French administrative procedures and public services.

CPAM / URSSAF

Your local CPAM can assist with healthcare and social security registration, while URSSAF is relevant for many self-employed and business registration procedures.

ESCEC International

ESCEC International — Additional guidance for international individuals and businesses dealing with French tax, accounting and administrative matters.

Updated for 2026: The key figures and procedures above have been aligned with current French administrative sources, including the current 13-digit tax number, the NIR/NIA process for people born abroad, and the current SIREN/SIRET definitions.

FAQ – Tax ID France, Social Security Number and SIREN/SIRET

What is a Tax ID in France?

The French Tax Identification Number (TIN) is commonly called the numéro fiscal or NIF (Numéro d’Identification Fiscale). For individuals, it is a 13-digit number used by the French tax administration to identify your tax file.

How many digits does a French tax ID have?

A French personal tax identification number has 13 digits. It is used for personal tax procedures and access to your account on impots.gouv.fr.

Is the French tax ID the same as the social security number?

No. They are two different identifiers. The tax ID identifies you for tax administration purposes, while the NIR/social security number identifies you within the French social protection system.

What is the French social security number?

The French social security number is called the NIR (Numéro d’Inscription au Répertoire). It contains 13 digits followed by a 2-digit control key and is used for healthcare, social benefits, employment-related procedures and pension rights.

Who needs a French social security number?

People who work, study or reside in France may need to be registered with the French social security system, depending on their circumstances and entitlement to French healthcare. The rules are not based simply on staying in France for more than 90 days.

Can I work in France without a definitive social security number?

Not having a definitive French social security number does not automatically prevent a foreign worker from legally working in France. Depending on the circumstances, registration may take place after arrival and a temporary identification number (NIA) may be issued while the definitive registration is completed.

How do I get a social security number in France?

The procedure depends on your situation. Employees may be registered through procedures involving their employer, while self-employed professionals may have registration procedures involving URSSAF. People born abroad may need to provide identity, civil-status and healthcare-eligibility documents.

Do foreign students need a French social security number?

Foreign students have specific healthcare registration procedures. The applicable process depends on factors such as nationality and existing social security coverage. EU, EEA and Swiss students may, depending on their circumstances, use European health insurance arrangements while meeting applicable French requirements.

What is a French NIA?

The NIA (Numéro d’Identification d’Attente) is a temporary identification number that may be assigned to a person while their definitive registration with the French social security system is being completed.

What can I use my French tax ID for?

Your numéro fiscal is used for tax-related procedures, including managing tax returns, accessing your personal tax account, viewing tax notices and communicating with the French tax administration.

How do I get a French tax ID?

For many taxpayers, the tax number is assigned when their tax file is created by the French tax administration. It can then be found on official documents such as income tax returns and tax notices.

How can I find my French tax number if I already have one?

You can find your 13-digit tax number on documents issued by the French tax administration, including tax returns and tax notices. If you have lost it, the French tax administration also provides an online recovery procedure using information such as your email address and date of birth.

Can I create an impots.gouv.fr account without a tax number?

If you do not yet have a French tax number, the procedure is different. According to the article, creating an online personal account without a tax number generally requires an initial tax procedure, including filing a first income tax return where applicable.

What is a SIREN number in France?

The SIREN is a 9-digit business identifier assigned to a legal unit. It identifies a business or individual entrepreneur within the French SIRENE system.

What is a SIRET number in France?

The SIRET is a 14-digit identifier for a specific establishment. It consists of the 9-digit SIREN plus a 5-digit NICidentifying the establishment.

What is the difference between SIREN and SIRET?

The SIREN identifies the business or legal unit, while the SIRET identifies a particular establishment belonging to that business. A business with several establishments can therefore have one SIREN and several SIRET numbers.

Can a SIRET number change?

Yes. Because the SIRET is linked to an establishment, it can change when an establishment moves or when its establishment information changes. The SIREN remains associated with the legal unit throughout its existence.

Is the SIREN or SIRET the same as a French tax ID?

No. SIREN and SIRET are business identifiers, whereas the French tax ID/numéro fiscal is used for an individual’s tax relationship with the French tax administration.

What are the main identification numbers foreigners need in France?

Depending on their circumstances, foreigners may encounter several different identifiers:

NIR: French social security number
Tax ID / numéro fiscal / NIF: personal tax identification
SIREN: business or legal-unit identification
SIRET: establishment identification