NIM20001 | Class 2 National Insurance contributions liability: Introduction
From HM Revenue & Customs · National Insurance Manual
Section 11 of the Social Security Contributions and Benefits Act 1992
Every self-employed earner (see NIM20100) who
has reached age 16, and
has not reached State Pension age, and
satisfies the prescribed conditions of residence or presence in the United Kingdom (see NIM20050)
was liable to pay Class 2 NICs except in the cases described in NIM20775.
A person who was employed and self-employed at the same time was liable for both Class 1 and Class 2 NICs (and Class 4 - see NIM24000 et seq) subject to an annual maximum. If the individual concerned expected to pay more than the annual maximum they could apply to defer payment of Class 2 (and Class 4) NICs (see NIM20725) up to 5 April 2015. Class 2 NICs are payable at a flat rate for each contribution week or part of a week in a contribution year (see NIM20100).
NIM20250 explains how Class 2 NICs could be paid up to 5 April 2015.
Interest was not payable on late Class 2 NICs but
they may have been charged at a rate higher than that which was in force at the time they were due (see NIM23002)
late payment could adversely affect entitlement to contributory benefits. Enquiries about how benefits were affected by late payment should be referred to DWP.