How to complete supplementary pages CT600M and what information you need to include.
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Get guidance from HMRC if you’re a tax agent or an adviser.
Find information about paying National Insurance contributions for company directors in current and previous tax years.
This publication details the volume of customs declarations and number of businesses declaring international trade in goods in the calendar year 2025.
Use this technical documentation for trust and estate returns if you’re a software developer working with the Self Assessment online service.
Check if you can get an exemption from Making Tax Digital for Income Tax and how it applies.
Find out about the different types of delivery costs, and which ones you must include or exclude in the customs value if you’re an importer or clearing agent.
Information about advance valuation rulings
Information about method 1, transaction value.
Submit a full return if your company’s or group’s interest deductions and financing costs are restricted, or an abbreviated return if they are not.