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Use this guidance for support if you're a software developer working with the Self Assessment Online service.
Guidance for EC Sales List online developers on Government Gateway.
Agent authorisation Construction Industry Scheme technical specifications for software developers.
Specifications and guidelines for Real Time Information internet submissions and for the outgoing Data Provisioning Service.
Find out about the Real Time Information (RTI) Rules and Interface Management (RIM) artefacts and supporting technical specifications for software developers.
Agent authorisation PAYE technical specifications for software developers.
Real Time Information (RTI) Rules and Interface Management (RIM) artefacts and supporting technical specifications for software developers.
Use this technical documentation for partnership returns if you’re a software developer working with the Self Assessment Online service
How to change the specification of a product name registered under the UK GI schemes, and object to a substantial change.
Overviews of the population screening end-to-end pathways.
A consultation on proposed changes to reasonable adjustments to qualifications for disabled students.
Use this technical documentation for individual returns if you're a software developer working with the Self Assessment Online service.
This collection brings together the Customs Freight Simplified Procedures message specifications previously published on the HM Revenue and Customs website.
This manual describes the software specification behind producing the Advisory Report for Display Energy Certificates.
Specifications of the data sets for the GRading and Admissions Data for England (GRADE) project.
Specification for software suppliers and local authorities preparing for the phonics screening check data collection 2024.
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