| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | Appointed day(s) for spec. provns. (6.12.1999) (1.1.2000) | The Immigration and Asylum Act 1999 (Commencement No. 1) Order 1999 | 1999 No. 3190 | art. 2 Sch. | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | | International Criminal Court Act 2001 | 2001 c. 17 | s. 31(7) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | modified | Nationality, Immigration and Asylum Act 2002 | 2002 c. 41 | s. 66(4) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | restricted | Nationality, Immigration and Asylum Act 2002 | 2002 c. 41 | Sch. 3 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | specified provisions extended (Jersey) (with modifications) | The Immigration and Asylum Act 1999 (Jersey) Order 2003 | 2003 No. 1252 | art. 2 Sch. | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | extended (Guernsey) (with modifications) | The Immigration and Asylum Act 1999 (Guernsey)Order 2003 | 2003 No. 2900 | art. 2 Sch. | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | applied (with modifications) | The Serious Organised Crime and Police Act 2005 (Application and Modification of Certain Enactments to Designated Staff of SOCA) Order 2006 | 2006 No. 987 | art. 7 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | modified by S.I. 1994/1405, art. 7 (as amended) | The Channel Tunnel (Miscellaneous Provisions) (Amendment) Order 2006 | 2006 No. 2627 | art. 2 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | amendment to earlier affecting provision S.I. 1994/1405, art. 7 | The Channel Tunnel (International Arrangements and Miscellaneous Provisions) (Amendment) Order 2007 | 2007 No. 3579 | art. 3(c) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | extended (Isle of Man) in part (with modifications) | The Immigration (Isle of Man) Order 2008 | 2008 No. 680 | art. 14 Sch. 6 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | applied (with modifications) | The Employment and Support Allowance (Transitional Provisions, Housing Benefit and Council Tax Benefit) (Existing Awards) Regulations 2010 | 2010 No. 875 | reg. 16 Sch. 2 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | applied (with modifications) | The Employment and Support Allowance (Transitional Provisions, Housing Benefit and Council Tax Benefit) (Existing Awards) (No. 2) Regulations 2010 | 2010 No. 1907 | reg. 16(2)(c) Sch. 2 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | amendment to earlier affecting provision S.I. 2008/680, art. 14, Sch. 6 | The Immigration (Isle of Man) (Amendment) Order 2011 | 2011 No. 1408 | Sch. para. 4 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | amendment to earlier affecting provision S.I. 2008/68, art. 14, Sch. 6 | The Immigration (Isle of Man) (Amendment) Order 2011 | 2011 No. 1408 | Sch. para. 5 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | amendment to earlier affecting S.I. 2003/1252, Sch. | The Immigration and Asylum (Jersey) Order 2012 (revoked) | 2012 No. 2593 | art. 4(2) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | applied (with modifications) | The Crime and Courts Act 2013 (Application and Modification of Certain Enactments) Order 2014 | 2014 No. 1704 | art. 8 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | amendment to earlier affecting provision S.I. 1994/1405, art. 7 | The Channel Tunnel (International Arrangements) and Channel Tunnel (Miscellaneous Provisions) (Amendment) Order 2015 | 2015 No. 856 | art. 6 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | amendment to earlier affecting S.I. 2003/1252, Sch. | The Immigration (Jersey) (Amendment) Order 2017 (revoked) | 2017 No. 981 | Sch. Pt. 2 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | amendment to earlier affecting provision S.I. 2008/680, art. 14, Sch. 6 | The Immigration (Isle of Man) (Amendment) Order 2019 | 2019 No. 562 | art. 5 7 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | amendment to earlier affecting provision S.I. 2008/680, art. 14, Sch. 6 | The Immigration (Isle of Man) (Amendment) Order 2019 | 2019 No. 562 | art. 5 13 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | amendment to earlier affecting provision S.I. 2008/680, Sch. 6 | The Immigration (Isle of Man) (Amendment) Order 2020 | 2020 No. 1214 | art. 8 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | amendment to earlier affecting provision S.I. 2003/2900, art. 2, Sch. | The Immigration (Guernsey) Order 2020 | 2020 No. 1560 | art. 8 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | extended in part (Jersey) (with modifications) | The Immigration (Jersey) Order 2021 | 2021 No. 1281 | art. 6 Sch. 4 4A | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | power to amend conferred | Nationality and Borders Act 2022 | 2022 c. 36 | s. 82(1)s. 82(2)(f)(3)-(6) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Act | excluded | Safety of Rwanda (Asylum and Immigration) Act 2024 | 2024 c. 8 | s. 2(5)(a) 5 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 20 heading | substituted | Immigration Act 2016 | 2016 c. 19 | s. 55(2) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 4(1) heading | substituted | Nationality, Immigration and Asylum Act 2002 | 2002 c. 41 | s. 49(2) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Pt. 2 | | The Carriers' Liability (Clandestine Entrants) (Application to Rail Freight) Regulations 2001 | 2001 No. 280 | reg. 2 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 33 heading | substituted | Nationality, Immigration and Asylum Act 2002 | 2002 c. 41 | Sch. 8 para. 4 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 32 cross-heading | substituted | Nationality and Borders Act 2022 | 2022 c. 36 | Sch. 5 para. 2 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 36 heading | words inserted | Nationality and Borders Act 2022 | 2022 c. 36 | Sch. 5 para. 10(2) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 40 heading | substituted | Nationality and Borders Act 2022 | 2022 c. 36 | s. 76(9)(a) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 40 cross-heading | substituted | Nationality and Borders Act 2022 | 2022 c. 36 | s. 76(9)(b) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Pt. 4 | repealed | Nationality, Immigration and Asylum Act 2002 | 2002 c. 41 | s. 114(1) Sch. 9 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Pt. 4 | savings for effects of 2002 c. 41, s. 114(1), Sch. 9 | The Asylum and Immigration (Treatment of Claimants, etc.) Act 2004 (Commencement No. 5 and Transitional Provisions) Order 2005 | 2005 No. 565 | art. 1(2) 9 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 87 cross-heading | substituted | The Transfer of Tribunal Functions Order 2010 | 2010 No. 22 | Sch. 2 para. 34 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 87 heading | substituted | The Transfer of Tribunal Functions Order 2010 | 2010 No. 22 | Sch. 2 para. 35(a) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 88 heading | words substituted | The Transfer of Tribunal Functions Order 2010 | 2010 No. 22 | Sch. 2 para. 36 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 89 heading | words substituted | The Transfer of Tribunal Functions Order 2010 | 2010 No. 22 | Sch. 2 para. 37 | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Pt. 6 | applied in part (with modifications) | Criminal Justice and Immigration Act 2008 | 2008 c. 4 | s. 134 135 | Not yet | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Pt. 6 heading | substituted | Immigration Act 2016 | 2016 c. 19 | Sch. 11 para. 6 | Not yet | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 95 heading | substituted | Immigration Act 2016 | 2016 c. 19 | Sch. 11 para. 8 | Not yet | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 98 heading | substituted | Immigration Act 2016 | 2016 c. 19 | Sch. 11 para. 12 | Not yet | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | Pt. 8 | modified | UK Borders Act 2007 | 2007 c. 30 | s. 2(6) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 3(10) | | The Carriers' Liability (Clandestine Entrants) (Application to Rail Freight) Regulations 2001 | 2001 No. 280 | reg. 4(1) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 4 | modified | Nationality, Immigration and Asylum Act 2002 | 2002 c. 41 | s. 23(5) | Not yet | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 4 | restricted | Nationality, Immigration and Asylum Act 2002 | 2002 c. 41 | s. 51(2)(b) | Not yet | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 4 | restricted | Nationality, Immigration and Asylum Act 2002 | 2002 c. 41 | s. 55(2)(a) | Yes | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 4 | excluded | Criminal Justice and Immigration Act 2008 | 2008 c. 4 | s. 134(5) | Not yet | |
| Immigration and Asylum Act 1999 | 1999 c. 33 | s. 4 | repealed | Immigration Act 2016 | 2016 c. 19 | Sch. 11 para. 1 | Yes | |