Change of https://www.gov.uk/government/publications/corporation-tax-technical-specifications-ct600-rim-artefacts

Change description : 2025-10-10 08:41:00: CT600 V3 (2026) Artefacts V1.994 has been added. [Guidance and regulation]

Showing diff : 2025-04-05 23:27:17.918668188 +00:00..2025-10-10 07:42:44.443225045 +00:00

Guidance

Corporation Tax technical specifications for CT600 RIM artefacts

CT600 V3 (2026), CT600 V3 (2025) and V2 (2009) RIM artefacts for Corporation Tax software developers.

From:
HM Revenue & Customs
Published
13 August 2014
Last updated
610 AprilOctober 2025 — See all updates

Documents

CT600 V3 (2026) Artefacts V1.994

ZIP, 6.7 MB

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CT600 V3 (2025) Artefacts V1.993

ZIP, 6.35 MB

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CT600 V2 (2009) Artefacts V3.99

2.3 MB

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Details

CT600 V3 (2026) Artefacts V1.994

Version date 10 October 2025.
Awaiting implementation into Local Test Service (LTS), Third Party Validation Service (TPVS) and live.

CT600 V3 (2025) Artefacts V1.993

Version date 18 November 2024.
Currently Local Test Service (LTS), Third Party Validation Service (TPVS) and live.

CT600 V2 (2009) Artefacts V3.99

Version date 19 June 2015.
Currently Local Test Service (LTS,), Third Party Validation Service (TPVS) and live.

Updates to this page

Published 13 August 2014
Last updated 610 AprilOctober 2025 + show all updates

  2. The CT600 V3 (2025) Artefacts V1.993 status has been updated to show it supports Local Test Service (LTS) and Third Party Validation Service (TPVS) and is now live. CT600 V3 (2024) Artefacts V1.992 status has been removed as it is no longer available.

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Update history

2025-10-10 08:41
CT600 V3 (2026) Artefacts V1.994 has been added.

2025-04-06 00:15
The CT600 V3 (2025) Artefacts V1.993 status has been updated to show it supports Local Test Service (LTS) and Third Party Validation Service (TPVS) and is now live. CT600 V3 (2024) Artefacts V1.992 status has been removed as it is no longer available.

2025-02-24 12:35
The CT600 V3 (2025) Artefacts V1.993 status has been updated to show it supports Local Test Service (LTS) and Third Party Validation Service (TPVS) and is awaiting implementation into live. CT600 V3 (2024) Artefacts V1.992 status has been updated as it is now only in live.

2025-01-27 09:46
The CT600 V3 (2025) Artefacts V1.993 status has been updated to awaiting implementation into Third Party Validation Service (TPVS) and live. CT600 V3 (2024) Artefacts V1.992 status has been updated as it is now in Third Party Validation Service (TPVS) and live.

2024-12-06 15:37
CT600 V3 (2025) Artefacts V1.993 has been added.

2024-04-06 00:01
CT600 V3 (2023) Artefacts V1.991 has been removed. CT600 V3 (2024) Artefacts V1.992 is now live.

2024-02-02 13:46
CT600 V3 (2024) Artefacts V1.992 status updated from ‘Awaiting implementation into LTS, TPVS and live’ to ‘Currently LTS, TPVS and awaiting implementation into live’. CT600 V3 (2023) Artefacts V1.991 updated from ‘Currently LTS, TPVS and live’ to ‘Currently live’.

2023-10-09 09:06
CT600 V3 (2024) Artefacts V1.992 has been added.

2023-04-06 00:15
CT600 V3 (2022) Artefacts V1.99 has been removed. CT600 V3 (2023) Artefacts V1.991 is now live.

2023-03-20 15:43
CT600 V3 (2022) Artefacts V1.99 status updated to currently live. CT600 V3 (2023) Artefacts V1.991 status updated to currently Local Test Service (LTS), Third Party Validation Service (TPVS) and awaiting implementation into live.

2022-12-21 12:00
CT600 V3 (2023) Artefacts V1.991 has been added.

2022-09-20 09:29
CT600 V3 (2022) Artefacts V1.97 has been removed. CT600 V3 (2022) Artefacts V1.99 has been changed to ‘Currently Local Test Service (LTS), Third Party Validation Service (TPVS) and live’.

2022-09-05 11:43
CT600 V3 (2022) Artefacts V1.99 has been changed to ‘Currently in Local Test Service (LTS), Third Party Validation Service (TPVS) and is awaiting implementation into live’. CT600 V3 (2022) Artefacts V1.97 has been changed to ‘Currently in live’.

2022-07-07 09:45
We have published CT600 V3 (2022) Artefacts V1.99 – V1.98 was not released externally. CT600 V3 (2022) V1.99 has been changed to awaiting implementation into Local Test Service (LTS), Third Party Validation Service (TPVS) and live.

2022-04-07 12:48
CT600 V3 (2021) V1.96 has been removed. CT600 V3 (2022) Artefacts V1.97 has been changed from ‘currently in LTS, TPVS and awaiting implementation in live’ to ‘currently in LTS, TPVS and live’.

2022-03-03 17:02
CT600 V3 (2022) Artefacts V1.97 has been changed from Awaiting implementation into LTS, TPVS and live to Currently in LTS, TPVS and awaiting implementation in live.