What is the annual earnings period for directors national insurance?
Answered 11 March 2026
Directors' National Insurance: Annual Earnings Period
What the law says
Under Regulation 8 of the Social Security (Contributions) Regulations 2001 (SI 2001 No 1004), the earnings period for a director is normally the full tax year in which the earnings are paid.
Specifically:
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Director at the start of a tax year, or who ceases to be a director during the tax year: has an annual earnings period for that entire tax year. The annual earnings period also remains if the company goes into liquidation.
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Director appointed during the tax year: has a pro-rata earnings period, calculated as the number of weeks remaining in the tax year from and including the week of appointment (under Regulation 8(2)).
A tax year runs from 6 April to the subsequent 5 April.
HMRC guidance / practice
HMRC commonly refers to a director's earnings period as an Annual Earnings Period (AEP), although this term does not appear in the legislation itself.
The rationale for the AEP rule is anti-avoidance: without it, a director could be voted their entire remuneration in a single week of the tax year and avoid most of their Class 1 primary NICs liability due to the weekly or monthly Upper Earnings Limit (UEL). The rule was introduced from 6 April 1983.
Pro-rata rules: All pro-rata calculations for directors are based on 52 weeks, even if there are 53 weeks in the year. However, if a director is appointed in tax week 53, the pro-rata earnings period is 1 week.
Citation sources
Directors appointed during the tax year have a pro-rata earnings period. Under regulation 8(2), the pro-rata earnings period is the number of weeks left in the tax year from and including the week of appointment. Under regulation 8(3), a person who is a director at the start of a tax year or ceases to be a director during the tax year has an annual earnings period for that tax year. The annual earnings period also remains if the company goes into liquidation. A tax year starts on 6 April and end
The legislation on employed earners and Class 1 contributions applies to directors unless otherwise stated or specific administrative concessions apply. Payments to a director are liable for Class 1 contributions because a directorship is an office (ESM2501 for offices generally and ESM4040 for directors) and therefore within the definition of “employed earner” in section 2(1)(a) of the Social Security Contributions and Benefits Act 1992. Normally payments to a director, for acting as a director