The National Insurance number: how to get one, how long it takes, and working without it

A National Insurance number is a permanent personal reference your contributions and tax are recorded against. It does not grant the right to work and does not replace a visa: the right to work comes from your status, while the number makes sure your contributions land on your account instead of getting lost.

Who already has a National Insurance number?

Before applying, check whether you already have one. People who grew up in the UK usually get one automatically around sixteen, if their parents claimed Child Benefit. Arrivals often find it already printed on a BRP or shown in the UKVI account next to the eVisa. The number is issued once for life: changing your name, status or job does not change it, and there is no new one to get.

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If you had a number and lost it, it is not reissued — it is found. GOV.UK has a "Find your National Insurance number" page; the number also appears in your personal tax account, the HMRC app, old payslips and P60s.

Who can apply?

You can apply if you live in the UK, have the right to work here, and are working, looking for work or holding a job offer. A simpler online route exists for 16- to 19-year-olds who did not receive a number automatically.

What does it cost and how long does it take?

The application is free. Any site or "helper" charging to arrange an NI number is an intermediary selling you a free service. It takes up to four weeks. After applying you get an email with a reference number — keep it, because that is what the helpline asks for if nothing has arrived after four weeks.

Can you work without one?

Yes. This is the part people usually do not know: not having an NI number does not stop you starting a job, provided you can prove your right to work. The employer must run a right to work check — via a share code from your UKVI account — and that is enough to put you on the payroll.

What happens in practice: until the number arrives you may be put on an emergency tax code and pay more than you owe. The money is not lost — once the number exists and HMRC links the records, the overpayment comes back, usually automatically within the same tax year. But an employer refusing to hire you "without an NI number" is simply wrong, and you can say so.

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What do you actually pay?

Employees pay Class 1: 8% on earnings from £242 to £967 a week (£1,048 to £4,189 a month) and 2% on anything above. The self-employed pay Class 4: 6% on profits from £12,570 to £50,270 and 2% above £50,270, with optional Class 2 at £3.65 a week.

There is an important band between the thresholds: earnings of £129 to £242 a week for employees, and profits from £7,105 a year for the self-employed. No contributions are due there, but the year still counts as qualifying. For part-time workers and new businesses that matters: State Pension years accumulate even when nothing is paid.

Why does it matter?

National Insurance is not an abstract tax. It decides entitlement to the State Pension and to the contribution-based benefits. Once a year it is worth opening "Check your National Insurance record" on GOV.UK to see whether every year is marked full. Errors happen — particularly for people who changed employers often or got their number late — and the sooner they are spotted, the easier they are to fix.

Contributions are not the only way to build qualifying years. A parent registered for Child Benefit for a child under twelve receives credits automatically, even without taking the payments.

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