National Insurance Number (NIN): what French movers really need to know
The NIN is your UK social security reference — but most Skilled Worker visa holders already have one without knowing it. Check before you apply for a new one.
You’re moving to the UK and you’ve heard you need a National Insurance Number — you want to know if you already have one, how to get it if not, and whether it blocks you from starting work.
- Check first: most Skilled Worker visa holders (and their dependants) are issued a NIN automatically as part of the immigration process — look at the back of your BRP or your UKVI eVisa account before assuming you need to apply.
- The NIN is your reference for tax and National Insurance contributions — the closest French equivalent is your numéro de sécurité sociale, though the format and logic differ completely.
- If you genuinely don’t have one, you apply online, but only once you’re physically in the UK — allow up to 4 weeks.
- You can usually start working before it arrives: give it to your employer once you have it; meanwhile you may be on an emergency tax code, corrected later.
- Don’t confuse it: the NIN is NOT your visa, NOT your NHS number, and NOT your UTR (self-assessment tax reference).
Do you already have one? Check before you apply
This is the step almost everyone skips: since the visa system now feeds data directly to HMRC, most Skilled Worker visa holders — and their dependants — are issued a NIN automatically, bundled into the immigration grant itself. You may already have one without ever having "applied."
Before doing anything else: look at the back of your Biometric Residence Permit (BRP) if you were issued one, or sign in to your UKVI eVisa account (the digital status that has replaced physical BRPs for most new arrivals). If a NIN is there, that's it — done, nothing to apply for.
What the NIN is
Your National Insurance Number is the reference that links you to UK tax and National Insurance contributions — the rough equivalent of your French numéro de sécurité sociale (the 15-digit number on your carte Vitale) for the payroll system. Your employer uses it so your tax and contributions are recorded against you, for life.
The exact format
A NIN looks like QQ 12 34 56 C — two letters, six digits, one letter. Unlike the French number, nothing here is personal: the six digits are just issued sequentially, and the final letter (always A, B, C or D) is a historical leftover from paper contribution cards returned quarterly — it means nothing today. The two prefix letters are simply an identifier (certain letters like D, F, I, Q, U, V are never used, to avoid confusion with other reference numbers).
Can you work without it?
Yes, usually. The NIN is often treated as a hard blocker, but you can start working and get paid before it arrives — you simply provide it to your employer once you have it. In the meantime you may be on an emergency tax code, which means you could overpay tax temporarily; it's corrected once your code is sorted (see our PAYE guide).
How to apply if you genuinely don't have one
If your BRP or eVisa account shows nothing, you apply online, but only once you're physically in the UK, through the official GOV.UK service, proving your identity and your right to work or reside. Processing can take up to 4 weeks, so start the moment you land.
What it is NOT
To avoid the classic confusion: the NIN is not your visa, not your NHS number (health), and not your UTR (the reference for self-assessment if you're self-employed). Four different things, four different processes, four different places to find them.
Your plan — a preview
Check your BRP/eVisa first, apply only if truly needed, work in the meantime, check your tax code. The dated sequence with reminders is what Veia builds for your arrival.
FAQ
How do I know if I already have a NIN?
Check the back of your Biometric Residence Permit (BRP) if you have one, or sign in to your UKVI eVisa account — many Skilled Worker visa holders and their dependants are issued a NIN automatically as part of the visa grant, without ever applying separately. This is the single most skipped step.
What does the number actually look like?
Two letters, six digits, one letter — e.g. QQ 12 34 56 C. The prefix letters are just an identifier (never D, F, I, Q, U or V as the first letter), the six digits are sequential, and the final letter (A, B, C or D) is a historical leftover from paper contribution cards — it has no meaning for you today.
Can I start work without a NIN?
Usually yes. You can begin working and be paid; you give your employer the number once you receive it. You may be put on an emergency tax code in the meantime, which is corrected afterwards.
How do I apply if I genuinely don’t have one?
Online, but only once you’re physically in the UK, via the official GOV.UK service. You’ll typically prove your identity and your right to work or reside. It can take up to 4 weeks, so apply the moment you land if your BRP/eVisa didn’t already include one.
Is the NIN the same as my NHS number or visa?
No. The NIN is for tax and National Insurance. Your NHS number (health) and your visa/immigration status are separate, and so is the UTR if you ever do self-assessment.
What’s the French equivalent?
Conceptually, your numéro de sécurité sociale (the 15-digit number on your carte Vitale) — both identify you permanently to your country’s contribution system. But the logic differs: the French number encodes your sex, birth year/month and department of birth; the NIN is just a sequential identifier with no personal data encoded.