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HMRC internal manual

National Insurance Manual

Class 3 NICs: time limits for paying Class 3 NICs: applying the higher rates

Section 13(6) of the Social Security Contributions and Benefits Act 1992

If Class 3 NICs are paid after the end of the second tax year after the one for which they are being paid, they should normally be paid at a higher rate. Each contribution is payable at the highest Class 3 NICs rate applicable in the period from the week the contribution was due to the date the contribution is paid. This does not apply in the circumstances described at NIM25030.

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Regulation 64 of the Social Security (Contributions) Regulations 2001

If HMRC invites payment of Class 3 NICs in the last month of a tax year and they are paid within one month of the request they will remain payable at the rates which applied at the time the payment was requested.