Class 1B contributions Class 1B contributionsF1

S. 10A and cross-heading inserted (8.9.1998 for specified purposes, 6.4.1999 in so far as not already in force) by Social Security Act 1998 (c. 14), ss. 53, 87(2); S.I. 1998/2209, art. 2(b)(c), Sch. Pts. 2, 3

Pt. 1 modified (2.4.1999) by The New Deal (25 plus) (Miscellaneous Provisions) Order 1999 (S.I. 1999/779), arts. 1(1), 2

Pt. 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 (13.9.2001) by The New Deal (Lone Parents) (Miscellaneous Provisions) Order 2001 (S.I. 2001/2915), arts. 1(1), 2

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(for the tax year 2022-23) by Health and Social Care Levy Act 2021 (c. 28), s. 5(2) (with s. 7(2)) (which Act was repealed (25.10.2022) by Health and Social Care Levy (Repeal) Act 2022 (c. 43), s. 1 (with savings and transitional modifications of Pt. 1 in s. 2, Sch.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))

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)