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Find technical specifications for Alcohol and Tobacco Warehousing Declaration (ATWD) software developers.
Find guidance and technical specifications for software developers on the IRmark.
This document and its annexes set out the original terms of collaboration between HMRC and software developers.
Find technical specifications and schemas for National Export System (NES) XML channel software developers.
How to choose data tools and infrastructure that are flexible, scalable, sustainable and secure.
Income Tax and National Insurance changes from April 2020.
Income Tax and National Insurance changes from April 2019.
This update relates to Autumn Statement 25 November 2015 Income Tax and National Insurance changes from 6 April 2016.
How employers can access recruitment APIs and API keys using their apprenticeship service account.
Income Tax and National Insurance changes from the Autumn Statement 22 November 2017 and Scottish Draft Budget 14 December 2017.
National Insurance guidance for software developers working with payroll software.
Autumn Statement 23 November 2016, Scottish Draft Budget 15 December 2016 and Income Tax changes from 6 April 2017.
How you can test and manage your API when it is in alpha development.
Design, build and operate APIs in a consistent way
Information for software developers and conveyancers who plan to develop the client side of HM Land Registry's Business Gateway interface.
Why to deploy regularly, deployment principles to follow, and how to do it.
How you can test and manage your API when it is in discovery.
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