NIC after State Pension Age
If you have reached the State Pension age and continue to work in most cases, you no longer need to pay National Insurance Contributions (NICs).
At State Pension age, the requirement to pay Class 1 and Class 2 NICs ceases. However, you will remain liable to pay any NICs due to be paid to you before reaching the State Pension age. If you continue working, you need to provide your employer with proof of your age.
Your employer remains liable to pay secondary Class 1 employer NICs. If you would rather not provide proof of age to your employer, you can request a letter (known as an age exception certificate) from HMRC confirming you have reached State Pension age and are no longer required to pay NICs.
If you are self-employed, you will need to pay Class 4 NICs for the remainder of the tax year in which you reach State Pension age but will be exempt from the following year.
We can help you check if you think you may have overpaid NICs and arrange for a refund if an overpayment has occurred.
Source: HM Revenue & Customs | 25-09-2019