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HMRC internal manual

National Insurance Manual

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HM Revenue & Customs
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Class 1A National Insurance contributions: Calculating Class 1A NICs: Percentage rate for calculating Class 1A NICs

Section 10(4) SSCBA 1992The percentage rate at which Class 1A NICs are calculated is the secondary (employer’s) not contracted-out Class 1 NICs rate in force during the tax year in which the benefit is provided.

Although Class 1A NICs are payable by the 19th July (22nd July if payment is by an approved electronic means – see NIM13003) in the tax year following the tax year in which the benefits are provided, the amount due is always calculated using the percentage rate in force during the year the benefit was provided.

Because of the retrospective nature of Class 1A NICs - liability arising in one tax year and payment following in the next - confusion can sometimes arise about which secondary Class 1 NICs percentage rate to use. Class 1A NICs are always calculated using the Class 1 NICs secondary not contracted-out percentage rate in force during the year in which the employee enjoys the benefit. Class 1A NICs are not calculated at the Class 1 NICs rate in force during the tax year in which Class 1A NICs are paid.

Example

Benefits provided in the 2006/2007 tax year are payable on the 19th or 22nd July 2007 – that is in the 2007/2008 tax year.

Class 1A NICs in respect of benefits provided in the 2006/2007 tax year are calculated at the secondary Class 1 NICs percentage rate in force during the 200062007 tax year.

For a table showing the secondary not-contracted out rate in force from the 1991/1992 to the current year, see NIM15021.