If you have lost or forgotten your National Insurance number there are a number of ways to locate it. Firstly, you could try and locate the number on paperwork such as your tax return, payslip or P60. You can also use your personal tax account or the HMRC App to find your National Insurance number.

If your National Insurance number still cannot be found a request can be submitted in writing to HMRC using form CA5403 or by telephone. HMRC will not disclose your number over the telephone and will instead send the details by post to the address HMRC has for you on file. The details should arrive within 15 days.

Teenagers should automatically be sent a letter just before their 16th birthday detailing their National Insurance number. These letters should be kept in a safe place. The previously issued plastic National Insurance cards are no longer available.

The National Insurance number helpline can help those aged between 16 and 20 who have not received a letter with details of their National Insurance number as well as other new applicants.

An individual must have the right to work or study in the UK in order to apply for a National Insurance number.

If you have lost or forgotten your National Insurance number you should try and locate the number on paperwork such as your tax return, payslip or P60. You can also login to your personal tax account to view, download, print, save or share a letter with your National Insurance number. 

If you do not already have a National Insurance number then you will normally need to apply for one if you are planning to work in the UK, claim benefits, apply for a student loan or pay Class 3 voluntary National Insurance contributions. You can apply for a National Insurance number if you live in the UK and have the right to work.

The Department for Work and Pensions (DWP) have launched a new National Insurance number application digital service which allows individuals to apply directly for a National Insurance number. An initial application should be made online and applicants will be advised if they need to book a face-to-face appointment. Applications are currently taking up to 16 weeks to be processed.