| Tax Credits Act 2002 | 2002 c. 21 | Act | | The Tax Credits (Appeals) (No. 2) Regulations 2002 | 2002 No. 3196 | reg. 24(1) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | Act | applied (with modifications) | The Universal Credit (Transitional Provisions) Regulations 2014 | 2014 No. 1230 | reg. 12(2)-(6) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | Act | applied (with modifications) by S.I. 2014/1230 reg. 12A(2) Sch. (as inserted) | The Universal Credit (Transitional Provisions) (Amendment) Regulations 2014 | 2014 No. 1626 | reg. 4(1) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | Act | applied with modification(s) | The Universal Credit (Transitional Provisions) Regulations (Northern Ireland) 2016 | 2016 No. 226 | reg. 10(2)-(6) | Yes |   This amendment comes into operation on the day on which the Universal Credit Regulations come into operation. |
| Tax Credits Act 2002 | 2002 c. 21 | Act | applied with modification(s) | The Universal Credit (Transitional Provisions) Regulations (Northern Ireland) 2016 | 2016 No. 226 | reg. 11(2) Sch. | Yes |   This amendment comes into operation on the day on which the Universal Credit Regulations come into operation. |
| Tax Credits Act 2002 | 2002 c. 21 | Act | applied with modification(s) | The Universal Credit (Transitional Provisions) Regulations (Northern Ireland) 2016 | 2016 No. 226 | Sch. para. 1-10 | Yes |   This amendment comes into operation on the day on which the Universal Credit Regulations come into operation. |
| Tax Credits Act 2002 | 2002 c. 21 | Act | amendment to earlier affecting S.I. 2014/1230, reg. 12(4) | The Universal Credit (Transitional Provisions) (Amendment) Regulations 2016 | 2016 No. 232 | reg. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | Act | amendment to earlier affecting provision by SI 2003/742 reg. 8 | The Child Tax Credit (Amendment) Regulations 2017 | 2017 No. 387 | reg. 7 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | Act | Amendment to earlier affecting provision SR 2016/226, reg. 10(2)-(6) | The Tax Credits (Exercise of Functions in relation to Northern Ireland and Notices for Recovery of Tax Credit Overpayments) Order 2017 | 2017 No. 781 | art. 8(3) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | Act | amendment to earlier affecting provision S.I. 2014/1230, Sch. 1 | The Social Security and Universal Credit (Miscellaneous Amendments) Regulations 2023 | 2023 No. 543 | reg. 6(5)(a) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | Pt. 1 | modified | The Tax Credits (Immigration) Regulations 2003 | 2003 No. 653 | reg. 4 | Yes |   This SI is amended by SI 2003/742 |
| Tax Credits Act 2002 | 2002 c. 21 | Pt. 1 | modified | The Tax Credits (Polygamous Marriages) Regulations 2003 | 2003 No. 742 | reg. 3-21 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | Pt. 1 | amendment to earlier affecting provision S.I 2003/653, reg. 4(1) | The Tax Credits (Polygamous Marriages) Regulations 2003 | 2003 No. 742 | reg. 56 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | Pt. 1 | repealed | Welfare Reform Act 2012 | 2012 c. 5 | Sch. 14 Pt. 1 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | Pt. 1 | amendment to earlier affecting provision by SI 2003/742 reg. 8 | The Child Tax Credit (Amendment) Regulations 2017 | 2017 No. 387 | reg. 7 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 36A-36D and cross-heading | inserted | Welfare Reform Act 2012 | 2012 c. 5 | s. 120(2) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 1 | functions made exercisable concurrently | The Transfer of Functions (International Development) Order 2017 | 2017 No. 1283 | art. 2(a) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 1(1)(2) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 1(3)(a)(f) | coming into force | The Tax Credits Act 2002 (Commencement No. 4, Transitional Provisions and Savings) Order 2003 | 2003 No. 962 | art. 2(3)(a) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 1(3)(b)(c) | coming into force | The Tax Credits Act 2002 (Commencement No. 4, Transitional Provisions and Savings) Order 2003 | 2003 No. 962 | art. 2(4)(a) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 1(3)(d) | coming into force | The Tax Credits Act 2002 (Commencement No. 4, Transitional Provisions and Savings) Order 2003 | 2003 No. 962 | art. 2(5) | See note |   Effect not applied to legislation.gov.uk. This commencing provision was amended by S.I. 2005/1106, S.I. 2006/3369, S.I. 2008/3151 and S.I. 2011/2910, art. 2 before finally being revoked (14.7.2014) by S.I. 2014/1848, art. 2 |
| Tax Credits Act 2002 | 2002 c. 21 | s. 1(3)(e) | coming into force | The Tax Credits Act 2002 (Commencement No. 3 and Transitional Provisions and Savings) Order 2003 | 2003 No. 938 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 2 | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 2 | substituted | Commissioners for Revenue and Customs Act 2005 | 2005 c. 11 | Sch. 4 para. 88 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 2 | functions made exercisable concurrently | The Tax Credits (Exercise of Functions) Order 2014 | 2014 No. 3280 | art. 3 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 3(1)(3) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 3(2) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 3(3)(a) | words substituted | Civil Partnership Act 2004 | 2004 c. 33 | Sch. 24 para. 144(2) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 3(4) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 3(5)-(8) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 3(5A) | substituted for s. 3(5)(6) | Civil Partnership Act 2004 | 2004 c. 33 | Sch. 24 para. 144(3) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 3(5A)(a)(b) | substituted for s. 3(5A)(a)-(d) | The Civil Partnership (Opposite-sex Couples) Regulations 2019 | 2019 No. 1458 | Sch. 3 para. 23(2) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 4 | functions made exercisable concurrently | The Transfer of Functions (International Development) Order 2017 | 2017 No. 1283 | art. 2(b) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 4(1) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 4(1)(g) | words substituted | Civil Partnership Act 2004 | 2004 c. 33 | Sch. 24 para. 145 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 4(1)(g) | words substituted | Civil Partnership Act 2004 | 2004 c. 33 | Sch. 24 para. 146 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 4(2) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 5(1) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 5(2) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 5(2) | excluded | The Tax Credits Act 2002 (Transitional Provisions) Order 2005 | 2005 No. 773 | art. 6 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 5(2) | excluded | The Tax Credits Act 2002 (Transitional Provisions) Order 2010 | 2010 No. 644 | art. 3(1)(2) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 5(3) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 6 | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 6 | modified | The Tax Credits Notification of Changes of Circumstances (Civil Partnership) (Transitional Provisions) Order 2005 | 2005 No. 828 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 7 | modified | The Universal Credit (Transitional Provisions) Regulations 2013 | 2013 No. 386 | Sch. para. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 7 | functions made exercisable concurrently | The Transfer of Functions (International Development) Order 2017 | 2017 No. 1283 | art. 2(c) | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 7(1)-(5) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes |   This S.I. is amended by S.I. 2002/2158, art 2 |
| Tax Credits Act 2002 | 2002 c. 21 | s. 7(6)-(9) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 7(10) | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |
| Tax Credits Act 2002 | 2002 c. 21 | s. 8 | coming into force | The Tax Credits Act 2002 (Commencement No. 1) Order 2002 | 2002 No. 1727 | art. 2 | Yes | |