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Self-Assessment

Guidance on Making Tax Digital (MTD) Income Tax and Self-Assessment (ITSA).
Checking your Self Assessment Obligations
Cumulative Update - Self Employment Reporting Categories
Using Calendar Quarters for MTD ITSA (2026/27 Onwards)
Check your Self-Assessment Business Details
Cumulative Updates
Prepare and Submit a Cumulative Update
Configuring your Cumulative Update Nominal Mappings
Cumulative Update - UK Property Reporting Categories
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