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HMRC internal manual

Debt Management and Banking Manual

Class 4 NICs: Payment of Class 4 NICs

Payment of Class 4

Section 15(2) of the Social Security Contributions and Benefits Act 1992 provides thatClass 4 contributions are payable “…in the same manner as any income tax …in accordance with assessments made from time to time under the Income Tax Acts.”

So the statutory due date for Class 4 is the same as for any tax in the assessment.

Payments made on account of tax and Class 4 NICs

In general, any payment made against an assessment for the year is considered to be onaccount of both tax and Class 4, even though in practice and for administrativeconvenience, the payment may only be accounted for under one or other head of duty.

Payments made on account of a tax and Class 4 assessment that has become final willadvance the cause of action under S29(5) Limitation Act 1980.