A National Insurance number is a unique reference number used by the UK government to keep track of an individual’s National Insurance contributions and entitlements. It is important to have your National Insurance number because it is used to calculate how much tax and National Insurance you should pay, to ensure you are getting the correct benefits and entitlements, and to help you build up your State Pension.
If you are not sure what your National Insurance number is, you can check it online using the government’s website. You will need to provide your date of birth and your postcode. Once you have entered this information, you will be able to see your National Insurance number on the screen.