Find communication products and information to help traders and intermediaries use the Customs Declaration Service.
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Find out about the the specific data elements needed for each declaration category when making an import declaration on the Customs Declaration Service.
Find out details of the Procedure Codes and Additional Procedure Codes (both Union and National) excluded from use with Simplified Declaration Procedure (SDP) with regular use and Entry in Declarants Records (EIDR).
Find out if you can claim Corporation Tax relief on your Research and Development (R&D) project.
Use this technical documentation for individual returns if you’re a software developer working with the Self Assessment online service.
Find out about the treatment of Capital Gains Tax for land valuation, disposals and land leases including freehold and selling short leases.
This manual brings together the operational guidance relevant to all teams across Specialist Investigations
Guidance for traders who enter customs declaration data into the Customs Handling of Import and Export Freight (CHIEF) system.
Find out if you need to pay tax on income from goods or services traded online.
How to amend or cancel simplified frontier declarations, C21s and non-special procedure non-monetary supplementary declarations.