Updated to 18 February 2026 (Act No. 1 of 2026 and S.I. No. 54 of 2026)
All effects below are reflected in the most recent Revised Act.
Commissions of Investigation Act 2004
No. 23 of 2004
Contents
Commencement
| Section | Commencement/Effective Date Where the commencement and effective dates differ, the effective date is shown below.
|
Commencement Information |
|---|---|---|
| Whole Act | 18 July 2004 | Commenced on enactment |
Amendments and other effects
| How Affected | Affecting Provision | Affecting Provision Commencement/Effective Date
Where the commencement and effective dates differ, the effective date is shown below.
|
Commencement Source |
|---|---|---|---|
| Application restricted | 20/2023, s. 53(4) | 4 March 2024 | Mother and Baby Institutions Payment Scheme Act 2023 (Commencement) Order 2024 (S.I. No. 67 of 2024), art. 3(d) |
| 20/2020, s. 3(3) | 25 October 2020 | Commenced on enactment | |
| 20/2020, s. 7(1) | 25 October 2020 | Commenced on enactment | |
| S. 2(1) amended (insofar as it applies to the Commission of Investigation) | 10/2016, ss. 8(a), 9(2) | 1 August 2016 | Commission of Investigation (Irish Bank Resolution Corporation) Act 2016 (Commencement) Order 2016 (S.I. No. 438 of 2016), art. 2 |
| S. 3 functions transferred and references construed | S.I. No. 418 of 2011, arts. 1(2), 3 & sch. 1 | 29 July 2011 | S.I. No. 418 of 2011, art. 1(2) |
| S. 8 functions transferred and references construed | S.I. No. 418 of 2011, arts. 1(2), 3 & sch. 1 | 29 July 2011 | S.I. No. 418 of 2011, art. 1(2) |
| S. 16 functions transferred and references construed | S.I. No. 418 of 2011, arts. 1(2), 3 & sch. 1 | 29 July 2011 | S.I. No. 418 of 2011, art. 1(2) |
| S. 17(1), (4) functions transferred and references construed | S.I. No. 418 of 2011, arts. 1(2), 3 & sch. 1 | 29 July 2011 | S.I. No. 418 of 2011, art. 1(2) |
| S. 21 application restricted | 10/2016, ss. 2(2), 9(2) | 1 August 2016 | Commission of Investigation (Irish Bank Resolution Corporation) Act 2016 (Commencement) Order 2016 (S.I. No. 438 of 2016), art. 2 |
| S. 23 functions transferred and references construed | S.I. No. 418 of 2011, arts. 1(2), 3 & sch. 1 | 29 July 2011 | S.I. No. 418 of 2011, art. 1(2) |
| S. 34(1) substituted (insofar as it applies to the Commission within the meaning of the Commission of Investigation (Irish Bank Resolution Corporation) Act 2016) | 10/2016, ss. 8(b), 9(2) | 1 August 2016 | Commission of Investigation (Irish Bank Resolution Corporation) Act 2016 (Commencement) Order 2016 (S.I. No. 438 of 2016), art. 2 |
| S. 39 section designated as s. 39(1) | 7/2018, ss. 1(3), 198(a) | 25 May 2018 | Data Protection Act 2018 (Commencement) Order 2018 (S.I. No. 174 of 2018), art. 3 |
| S. 39(1) amended | 7/2018, ss. 1(3), 198(b) | 25 May 2018 | Data Protection Act 2018 (Commencement) Order 2018 (S.I. No. 174 of 2018), art. 3 |
| S. 39(2) inserted | 7/2018, ss. 1(3), 198(c) | 25 May 2018 | Data Protection Act 2018 (Commencement) Order 2018 (S.I. No. 174 of 2018), art. 3 |
| S. 40 repealed | 30/2014, ss. 1(2), (3), 5, sch. 4 | 14 October 2014 | Commenced on enactment |
| S. 40(1) amended | 23/2011, s. 57(a) | 2 August 2011 | Commenced on enactment |
| S. 40(3) amended | 23/2011, s. 57(b) | 2 August 2011 | Commenced on enactment |
| S. 43 application restricted | 20/2020, s. 7(1) | 25 October 2020 | Commenced on enactment |
| S. 43(2) application restricted | 20/2020, s. 2 | 25 October 2020 | Commenced on enactment |
SIs made under the Act
| Section | SIs made under the Act |
|---|---|
| S. 3 | Commission of Investigation (Handling of Historical Child Sexual Abuse in Day and Boarding Schools) Order 2025 (S.I. No. 388 of 2025) |
| Commission of Investigation (Response to complaints or allegations of child sexual abuse made against Bill Kenneally and related matters) Order 2018 (S.I. No. 311 of 2018) | |
| Commission of Investigation (National Asset Management Agency) Order 2017 (S.I. No. 267 of 2017) | |
| Commission of Investigation (Certain matters relative to a disability service in the South East and related matters) Order 2017 (S.I. No. 96 of 2017) | |
| Commission of Investigation (Irish Bank Resolution Corporation) (Amendment) Order 2016 (S.I. No. 417 of 2016) | |
| Commission of Investigation (Irish Bank Resolution Corporation) Order 2015 (S.I. No. 253 of 2015) | |
| Commission of Investigation (Mother and Baby Homes and certain related Matters) Order 2015 (S.I. No. 57 of 2015) | |
| Commission of Investigation (Certain Matters relative to the Cavan/Monaghan Division of the Garda Síochána) Order 2015 (S.I. No. 38 of 2015) | |
| Commission of Investigation (Ronan MacLochlainn) Order 2014 (S.I. No. 346 of 2014) | |
| Commission of Investigation (Certain Matters relative to An Garda Siochana and other persons) Order 2014 (S.I. No. 192 of 2014) | |
| Commission of Investigation (Banking Sector) Order 2010 (S.I. No. 454 of 2010) | |
| Commission of Investigation (Death of Gary Douch in Mountjoy Prison) Order 2007 (S.I. No. 371 of 2007) | |
| S. 3(1) | Commission of Investigation (Leas Cross Nursing Home Order) 2007 (S.I. No. 304 of 2007) |
| Commission of Investigation (Child Sexual Abuse) Order 2006 (S.I. No. 137 of 2006) | |
| Commission of Investigation (Dean Lyons Case) Revised Order 2006 (S.I. No. 69 of 2006) | |
| Commission of Investigation (Dublin and Monaghan Bombings) Order 2005 (S.I. No. 222 of 2005) | |
| S. 4(1) | Commission of Investigation (Certain matters relative to a disability service in the South East and related matters) Order 2017 (S.I. No. 96 of 2017) |
| Commission of Investigation (Ronan MacLochlainn) Order 2014 (S.I. No. 346 of 2014) | |
| Commission of Investigation (Banking Sector) Order 2010 (S.I. No. 454 of 2010) | |
| Commission of Investigation (Death of Gary Douch in Mountjoy Prison) Order 2007 (S.I. No. 371 of 2007) | |
| Commission of Investigation (Leas Cross Nursing Home Order) 2007 (S.I. No. 304 of 2007) | |
| Commission of Investigation (Dean Lyons Case) Revised Order 2006 (S.I. No. 69 of 2006) | |
| S. 4(2) | Commission of Investigation (Banking Sector) (Amendment) Order 2010 (S.I. No. 590 of 2010) |
| S. 6 | Commission of Investigation (Banking Sector) (Amendment) Order 2010 (S.I. No. 590 of 2010) |
| Commission of Investigation (Child Sexual Abuse) (Amendment) Order 2009 (S.I. No. 117 of 2009) | |
| S. 7(2)(a) | Commissions of Investigation Act 2004 (S.I. No. 388 of 2025) |
| Commission of Investigation (Response to complaints or allegations of child sexual abuse made against Bill Kenneally and related matters) Order 2018 (S.I. No. 311 of 2018) | |
| Commission of Investigation (Certain matters relative to a disability service in the South East and related matters) Order 2017 (S.I. No. 96 of 2017) | |
| Commission of Investigation (Mother and Baby Homes and certain related Matters) Order 2015 (S.I. No. 57 of 2015) | |
| Commission of Investigation (Ronan MacLochlainn) Order 2014 (S.I. No. 346 of 2014) | |
| Commission of Investigation (Banking Sector) Order 2010 (S.I. No. 454 of 2010) | |
| Commission of Investigation (Death of Gary Douch in Mountjoy Prison) Order 2007 (S.I. No. 371 of 2007) | |
| Commission of Investigation (Leas Cross Nursing Home Order) 2007 (S.I. No. 304 of 2007) | |
| Commission of Investigation (Dean Lyons Case) Revised Order 2006 (S.I. No. 69 of 2006) |