NI Number

A NI Number is a number used in the UK in the administration of National Insurance (social security) and taxes. The number is sometimes referred to as a NI No, NIN or NINO. Your are only able to apply for a NI Number once you’ve arrived in the UK, to apply you must prove that you have the right to work or study in the UK .

It is possible to start work before your NI Number arrives, you will just need to prove to your employer that you are legally allowed to work in the UK. Ensure you tell your employer that you’ve applied for a NIN (or are in the process of applying for one), and give it to them when you have it.

After you’ve applied for your NI Number, Jobcentre Plus will write to you and ask you to come to an interview. At the interview you’ll be asked about your circumstances and why you need a National Insurance number. The letter will also tell you which documents to bring to prove your identity, eg:

  • passport or identity card
  • residence permit
  • birth or adoption certificate
  • marriage or civil partnership certificate
  • driving licence

At the completion of the interview you should be advised how long it’ll take to receive your NIN.

Obtaining a NI Number is free and relatively simple process so be sure not to suckered into paying a company to help you apply for one.

NI Number application line

Telephone: 0345 600 0643

Monday to Friday, 8am to 6pm

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