NIM20200 - Class 2 National Insurance contributions liability: Contribution week

Regulations 1(2) and 155 of the Social Security (Contributions) Regulations 2001 (SI 2001 No. 1004)

Where a person is liable to pay Class 2 National Insurance contributions (NICs), Class 2 NICs are due for each contribution week or part of a week that a person was self-employed. So, where a person was self-employed and liable to pay Class 2 NICs for part or all of one day in a week, liability arises for one week’s NICs due at the weekly flat rate.

A ‘contribution week’ is defined as a period of seven days beginning with midnight between Saturday and Sunday. The first day of the contribution week is Sunday and Saturday is the last. The first week of the contribution year starts on the first Sunday after 5 April.