Getting your first numéro fiscal: the French tax number, explained

Of all the small administrative keys a British arrival needs to cut, the numéro fiscal is the one people trip over first — usually because they assume, reasonably, that a country keen on taxing residents would simply issue everyone a number on arrival. France does not. Instead the number materialises out of your first proper contact with the tax authority, and until it does, a surprising number of doors stay shut: you can't file online, you can't open your personal tax space, and you can't use tax as your FranceConnect identity. So it's worth getting deliberately and early, rather than discovering you need it at the worst possible moment.

The good news is that it's genuinely free, reasonably quick by French standards, and there are three separate routes to it, so you can pick whichever suits your French, your patience, and your deadline.

What the number actually is

Your numéro fiscal — also called the numéro fiscal de référence or SPI — is a thirteen-digit identifier unique to you as a taxpayer. It appears on your tax assessments, on correspondence from the fisc, and inside your online tax account once you have one. Everyone in a household who is taxed has their own; couples filing jointly each keep an individual number even while submitting one return. It stays with you for life, so the effort of getting it is a one-time cost.

Crucially, it is not the same as your numéro de sécurité sociale, the fifteen-character social-security number that governs healthcare. British arrivals routinely muddle the two, hand the wrong one over, and cause themselves a small delay. The rule of thumb: tax number for anything to do with impôts; social-security number for anything to do with Assurance Maladie, Ameli and the carte VitaleThe green card that makes French health reimbursements automatic at the doctor or pharmacy.. They come from different offices and arrive on different timelines.

Where to find it once you have it

If you suspect you already have a number — perhaps you've had any contact with the French tax system at all — it's worth checking before you request a new one, because having two records is a nuisance to untangle. The numéro fiscal is printed in a few reliable places: the top of any avis d'impôt (tax assessment) you've received, the front page of a pre-filled paper declaration, and, once you have an online account, prominently inside your espace particulier on impots.gouv.fr. It always runs to thirteen digits and conventionally begins with a 0, 1, 2 or 3. If you find one already issued to you, use that; don't apply afresh.

Resident, non-resident, and why it matters here

One distinction shapes which office deals with you and how. If you live in France — the ordinary case for someone who has moved here — you are a tax resident, you'll declare your worldwide income, and your local centre des finances publiques is your point of contact. If instead you own a French property or earn French income but live abroad, you're a non-resident, and a dedicated service for non-residents (the Service des impôts des particuliers non-résidents) issues and handles your number. The routes below assume you're resident, which is what most people reading this will be; if you're the non-resident sort, the online contact form is usually your cleanest path, and you say so on it.

This matters because handing your file to the wrong office is a classic source of delay. A newly arrived resident who contacts the non-resident service, or vice versa, can find their request bouncing between departments for weeks. Be clear, on any form or at any counter, that you now live in France and give your French address — that single fact routes you correctly.

The three routes, and which is yours

All three lead to the same thirteen digits; they differ only in speed and effort. Open the one that fits your situation.

Most commonRoute 1 — file your first tax return (the default)

In your first year you file on paper, and the assessment that comes back around August carries your brand-new numéro fiscal on it. For most arrivals this is simply how the number appears — you don't request it separately, you earn it by declaring. Attach copies of your ID to the paper return so the office can match you to a record. The catch is timing: you file in spring, the number lands in late summer, so if you need it sooner, use one of the other two routes.

FastestRoute 2 — ask your local tax office in person

Walk into your centre des finances publiques — the local tax office, findable on impots.gouv.fr — with your passport and a proof of address, and ask to be issued a numéro fiscal. Staff can create a record for you on the spot or shortly after. This is the fastest route if you're comfortable doing it in French, and a surprising number of offices are helpful once you're standing in front of them.

From homeRoute 3 — the online contact form

On impots.gouv.fr, open the contact section: choose particulier, then accéder, and work down to the option that says, in effect, 'I don't have a tax number' (je n'ai pas de numéro fiscal). You'll complete a short form and upload copies of your ID. The number then arrives by post or secure message, typically within a few weeks. Good if you can't get to an office and don't yet have a return to file.

Turning the number into an online account

Getting the number is half the job; the other half is using it to open your espace particulier — your personal online tax space — because that's what unlocks online filing, your payment history, and tax-as-a-FranceConnect-key. To create the account you need two things: the numéro fiscal itself, and an online access code (the numéro d'accès en ligne) which is printed on the front of the paper tax forms and on your assessment. With both in hand, you register on impots.gouv.fr, set a password, and you're in.

From that point, two nice things follow. First, filing moves online from your second year onward, which is far quicker than paper. Second — and this is the part people underrate — your tax login becomes one of the handful of accounts that can power FranceConnect, the single sign-on for a thousand government services. In other words, the humble tax number you chased for a tax return quietly becomes a master key for healthcare, pensions, your residence-permit portal and much else besides.

The household — your foyer fiscal

France taxes by household, the foyer fiscal, not purely by individual, and this quietly affects the number question for couples and families. A married couple or those in a PACSPacte civil de solidarité — a registered civil partnership, lighter than marriage but with real legal effects. generally file a single joint declaration, yet each adult still carries their own personal numéro fiscal. Children and dependants are attached to the household rather than issued their own numbers until they file in their own right. The practical upshot for a couple moving together: you each need to secure your own number, but you'll declare as one unit. Don't let one partner's number stand in for both when an office or a website asks specifically for yours.

This household logic also explains a wrinkle new arrivals notice: the way France works out your tax rate looks at the whole household's income and circumstances, which is why even income taxed elsewhere (a UK government pension, say) has to be declared here — not to be taxed twice, but so the household rate is calculated correctly. The number is simply the thread that ties you to that household record.

Common snags

A few things reliably go wrong, and all are avoidable. The first is the ID mismatch: if the name on your ID doesn't exactly match what you write on a form — a missing middle name, an anglicised accent — the office can struggle to create or find your record. Match your passport exactly. The second is the wrong number handed over, the tax-versus-social-security muddle above. The third is assuming it's instant: even the quick routes take days to weeks, so build in time. And the fourth, particular to couples, is each person needing their own; don't assume one number covers a household.

If you hit a genuine wall — no response to a contact form, an office that can't find you — the fix is almost always a polite in-person visit to the centre des finances publiques with your passport and a proof of address. French tax offices have a reputation, but on this particular errand they are usually more helpful than their reputation suggests, precisely because issuing a taxpayer a number is squarely in their interest.

Get it early, keep it somewhere permanent, and use it to open your online space the moment you can. It's a small key, but a great many larger doors turn on it.

Routes, timelines and the online account steps described here are current for 2026 and drawn from official and specialist sources, but French tax administration varies by office and changes over time. Pimpernel are not accountants or tax advisers. Confirm the current process on impots.gouv.fr or with a qualified cross-border accountant before acting. This guide is general information, not tax advice.