A national insurance number (NINO) is a number unique to you which is used to keep track of your national insurance contributions and the benefits which you are paid. The number is made up of two letters, six numbers and one letter, for example, AB 123456 C. You must not let anyone else use your number.

You don’t have a legal right to a national insurance number, but you are legally obliged to apply for one if you start work, or if you (or your partner) claim benefit.