http://www.legislation.gov.uk/ukpga/1992/4/section/13Social Security Contributions and Benefits Act 1992An Act to consolidate certain enactments relating to social security contributions and benefits with amendments to give effect to recommendations of the Law Commission and the Scottish Law Commission.1992-02-13texttext/xmlenStatute Law Database2026-06-29Expert Participation2026-04-29 Part I Contributions Class 3 contributions Class 3 contributions.131The Treasury shall by regulations provide for earners and others, if over the age of 16, to be entitled if they so wish, but subject to any prescribed conditions, to pay Class 3 contributions; and, subject to the following provisions of this section, the amount of a Class 3 contribution shall be £18.40.2Payment of Class 3 contributions shall be allowed only with a view to enabling the contributor to satisfy ... conditions of entitlement to benefit by acquiring the requisite earnings factor for the purposes described in section 22 below.3 The Secretary of State may by regulations provide for Class 3 contributions, although paid in one tax year, to be appropriated in prescribed circumstances to the earnings factor of another tax year.4The amount of a Class 3 contribution in respect of a tax year earlier than the tax year in which it is paid shall be the same as if it had been paid in the earlier year and in respect of that year, unless it falls to be calculated in accordance with subsection (6) below or regulations under subsection (7) below.5In this section—“the payment year” means the tax year in which a contribution is paid; and“the contribution year” means the earlier year mentioned in subsection (4) above.6Subject to subsection (7) below, in any case where—aa Class 3 contribution is paid after the end of the next tax year but one following the contribution year; andbthe amount of a Class 3 contribution applicable had the contribution been paid in the contribution year differs from the amount of a Class 3 contribution applicable at the time of payment in the payment year,the amount of the contribution shall be computed by reference to the highest of those two amounts and of any other amount of a Class 3 contribution in the intervening period.7The Treasury may by regulations provide that the amount of a contribution which apart from the regulations would fall to be computed in accordance with subsection (6) above shall instead be computed by reference to the amount of a Class 3 contribution for a tax year earlier than the payment year but not earlier than the contribution year.S. 13(1): power to amend conferred (1.7.1992) by Social Security Administration Act 1992 (c. 5), ss. 145(4)(b), 192(4)Pt. 1 modified (2.4.1999) by The New Deal (25 plus) (Miscellaneous Provisions) Order 1999 (S.I. 1999/779), arts. 1(1), 2Pt. 1 modified (13.9.2001) by The New Deal (Lone Parents) (Miscellaneous Provisions) Order 2001 (S.I. 2001/2915), arts. 1(1), 2S. 13(6) excluded (5.4.2023) by S.I. 2001/1004, reg. 65BA(2)(4) (as inserted by The Social Security (Contributions) (Amendment No. 3) Regulations 2023 (S.I. 2023/309), regs. 1, 4(1))S. 13(6) excluded (5.4.2023) by S.I. 2001/1004, reg. 50C(6A) (as inserted by The Social Security (Contributions) (Amendment No. 3) Regulations 2023 (S.I. 2023/309), regs. 1, 3(2))Sum in S. 13(1) substituted (6.4.2026) by The Social Security (Contributions) (Rates, Limits and Thresholds Amendments, National Insurance Funds Payments and Extension of Veteran’s Relief) Regulations 2026 (S.I. 2026/231), regs. 1, 4Word in s. 13(2) omitted (6.4.2016) by virtue of Pensions Act 2014 (c. 19), s. 56(4), Sch. 12 para. 4Pt. 1 modified (6.4.2001) by The Social Security (Contributions) Regulations 2001 (S.I. 2001/1004), regs. 1(1), 125 (as amended (6.4.2017) by S.I. 2017/416, regs. 1(2), 2; (6.4.2019) by S.I. 2019/555, regs. 1(2), 2)Pt. 1 modified (in relation to the tax year 2023-24) by National Insurance Contributions (Reduction in Rates) Act 2023 (c. 57), Sch. para. 1(1)-(3)Pts. 1, 6 modified (6.4.2001) by S.I. 2001/1004, regs. 1(1), 113, 114(2) (with reg. 138)Pt. 1 modified (for the tax year 2022-23) by Health and Social Care Levy Act 2021 (c. 28), s. 5(2) (with s. 7(2)) (which Act was repealed (25.10.2022) by Health and Social Care Levy (Repeal) Act 2022 (c. 43), s. 1 (with savings and transitional modifications of Pt. 1 in s. 2, Sch. paras. 1-3, 5))S. 13(1): power to amend conferred (1.7.1992) by Social Security Administration Act 1992 (c. 5), ss. 143(1)(4), 192(4)S. 13(1): power to amend conferred (1.7.1992) by Social Security Administration Act 1992 (c. 5), ss. 141(4), 192(4).Words in s. 13(3) substituted (1.4.1999) by Social Security Contributions (Transfer of Functions, etc.) Act 1999 (c. 2), s. 28(3), Sch. 3 para. 14(3); S.I. 1999/527, art. 2(b), Sch. 2 (with arts. 3-6)Word in s. 13(7) substituted (1.4.1999) by Social Security Contributions (Transfer of Functions, etc.) Act 1999 (c. 2), s. 28(3), Sch. 3 para. 14(4); S.I. 1999/527, art. 2(b), Sch. 2 (with arts. 3-6)Words in s. 13(1) substituted (1.4.1999) by Social Security Contributions (Transfer of Functions, etc.) Act 1999 (c. 2), s. 28(3), Sch. 3 para. 14(2); S.I. 1999/527, art. 2(b), Sch. 2 (with arts. 3-6)