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HMRC internal manual

National Insurance Manual

HM Revenue & Customs
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Class 3 NICs: time limits for paying class 3 NICs: applying the higher rates

Section 13(6), 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 rate applicable in the period from the week the contribution was due to the date the contribution is paid. This does not apply

  • for the years 1996/97 to 2001/02 when the special provisions at NIM25043 apply, or
  • in the circumstances described at NIM25030.

Regulation 64, 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.