tag:www.gov.uk,2005:/search/guidance-and-regulation Guidance and regulation 2026-05-15T15:43:23+01:00 HM Government tag:www.gov.uk,2005:/government/publications/corporation-tax-technical-specifications-xbrl-and-ixbrl 2026-05-15T15:43:23+01:00 Corporation Tax technical specifications in XBRL and iXBRL format Find guidance on how to create iXBRL accounts and computations if you are a Corporation Tax software developer. tag:www.gov.uk,2005:/government/publications/import-control-system-2-service-availability-and-issues 2026-05-15T08:30:48+01:00 Import Control System 2: service availability and issues Check the availability and any issues affecting the Import Control System 2 (ICS2) service. tag:www.gov.uk,2005:/guidance/choose-the-right-software-for-pillar-2-top-up-taxes 2026-05-13T09:17:49+01:00 Choose the right software for Pillar 2 Top-up Taxes Find out what commercial software you will need to report Domestic Top-up Tax and Multinational Top-up Tax. tag:www.gov.uk,2005:/guidance/list-of-software-developers-providing-customs-declaration-support 2026-05-07T11:14:02+01:00 Software developers providing customs declaration software Check a list of software developers who can provide Customs Declaration Service software. tag:www.gov.uk,2005:/guidance/software-developers-providing-entry-summary-declaration-support 2026-05-07T10:26:25+01:00 Software developers providing entry summary declaration support Find software developers that can help with entry summary declarations including safety and security declarations for imports. tag:www.gov.uk,2005:/government/publications/corporation-tax-commercial-software-suppliers 2026-05-07T07:47:58+01:00 Filing your Company Tax Return online Find recognised commercial software suppliers and software you can use to file your Company Tax Return and any supplementary pages online. tag:www.gov.uk,2005:/government/publications/outgoing-data-provisioning-service-outgoing-xml-generator 2026-05-05T09:41:04+01:00 Outgoing Data Provisioning Service: Outgoing XML Generator Use this tool if you are a software developer wanting to produce user-defined XML test scenarios. tag:www.gov.uk,2005:/government/publications/alcohol-and-tobacco-warehousing-declarations-service-availability-and-issues 2026-04-27T08:00:02+01:00 Alcohol and Tobacco Warehousing Declarations: service availability and issues Check the availability and any issues affecting Alcohol and Tobacco Warehousing Declarations (ATWD). tag:www.gov.uk,2005:/government/publications/gambling-tax-service-availability-and-issues 2026-04-23T15:23:46+01:00 Gambling Tax: service availability and issues Check the availability and any issues affecting the Gambling Tax online service. tag:www.gov.uk,2005:/government/publications/self-assessment-technical-specifications-2026-for-individual-returns 2026-04-17T09:19:45+01:00 Self Assessment technical specifications (2026) for individual returns Use this technical documentation for individual returns if you're a software developer working with the Self Assessment online service. tag:www.gov.uk,2005:/guidance/changes-and-issues-affecting-the-corporation-tax-online-service 2026-04-16T14:55:14+01:00 Changes and issues affecting the Corporation Tax online service Check changes and issues that may affect how you file your Company Tax Return. tag:www.gov.uk,2005:/government/publications/self-assessment-commercial-software-suppliers 2026-04-16T10:49:52+01:00 Self Assessment commercial software suppliers Find software suppliers for tax returns, supplementary pages and attachments. tag:www.gov.uk,2005:/government/publications/self-assessment-technical-specifications-2026-for-trust-and-estate-returns 2026-04-15T14:48:33+01:00 Self Assessment technical specifications (2026) for trust and estate returns Use this technical documentation for trust and estate returns if you’re a software developer working with the Self Assessment online service. tag:www.gov.uk,2005:/government/publications/charities-online-commercial-software-suppliers 2026-04-14T16:47:36+01:00 Find software suppliers for filing charities repayments online Find recognised suppliers and software to file charity repayment claims online. tag:www.gov.uk,2005:/government/publications/alcohol-and-tobacco-warehouse-declaration-technical-documentation 2026-04-08T09:00:05+01:00 ATWD: technical specifications Find the alcohol and tobacco warehouse declaration (ATWD) technical specifications for software developers. tag:www.gov.uk,2005:/government/publications/paye-draft-forms-p11d-p9d 2026-04-07T13:26:23+01:00 PAYE draft forms: P11D and P11D Working Sheets Use the approved draft versions of the forms to help you create payroll software if you're a software developer. tag:www.gov.uk,2005:/government/publications/corporation-tax-technical-specifications-ct600-rim-artefacts 2026-04-07T09:23:02+01:00 Corporation Tax technical specifications for CT600 RIM artefacts CT600 V3 (2026) and V2 (2009) RIM artefacts for Corporation Tax software developers. tag:www.gov.uk,2005:/government/publications/paye-draft-forms-p60 2026-04-06T00:15:23+01:00 PAYE draft forms: P60 Find draft forms that help software developers design payroll software. tag:www.gov.uk,2005:/government/publications/real-time-information-internet-submissions-generic-technical-specifications 2026-04-06T00:15:08+01:00 Real Time Information internet submissions: generic technical specifications Internet submissions technical specifications for Real Time Information online software developers. tag:www.gov.uk,2005:/government/publications/self-assessment-technical-specifications-2026-for-partnership-returns 2026-03-30T15:54:31+01:00 Self Assessment technical specifications (2026) for partnership returns Use this technical documentation for partnership returns if you’re a software developer working with the Self Assessment online service.