Hi olivia malcolm,
If your profit from self employment is under the small profit threshold (USPT) you can opt to pay Class 2 NICs voluntarily through self assessment, however any payment must be received by 31 January of the following year (so for example, a payment for the 2021-22 year must be paid through self assessment no later than 31 January 2023.
It is still possible to pay Class 2 NICs on a voluntary basis after this date but payment must be made directly to the NI office.
In order to do this I am afraid you must call NI helpline on 0300 200 3500. Lines are open 8am – 6pm Monday to Friday.
Due to recent publicity about the payment of NICs on a voluntary basis, we are seeing an unusually high volume of calls which means that not everyone is able to speak to us as easily as we would like.
As the deadline for payment has now been extended
Voluntary National Insurance you may wish to try calling at a later stage.
Thank you