Lost National Insurance Number UK — How to Find It

If you have lost or forgotten your National Insurance number, do not worry — you cannot lose it permanently. Your NI number is yours for life and is stored in HMRC's records. There are several ways to find it.

Your NI number appears on several documents you may already have:

• P60 — your annual tax summary from your employer
• Payslip — every payslip shows your NI number
• P45 — the form you get when leaving a job
• HMRC letters — any letter about tax, NI, or benefits
• State Pension statement — official pension correspondence
• Tax credit award letters — if you claim tax credits

Check these documents first — many people find their NI number on a recent payslip.

If you cannot find any of the above documents, you can check your HMRC Personal Tax Account online. This free government service lets you view your NI number, check your NI contributions, and manage your tax. To access it, you need to verify your identity using the GOV.UK ID Check app or Government Gateway login.

If you cannot find your NI number online or on any documents, you can request HMRC to send you a confirmation letter by post. This is a free service, though it may take up to 15 working days to arrive. You can also go through HMRC's online chat or call the NI number helpline.

Alternatively, our service can assist with requesting a confirmation letter on your behalf.

If you have never had an NI number — perhaps because you are new to the UK, recently turned 16, or never worked before — you will need to apply for one. Our assisted service can handle the entire application on your behalf.