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Self-Assessment

Guidance on Making Tax Digital (MTD) Income Tax and Self-Assessment (ITSA).
Cumulative Updates
Self-Assessment Workflow
Joining the Making Tax Digital (MTD) for Income Tax and Self Assessment Pilot Scheme
Final Declaration
Business Income Source Summary (BISS)
Trading Losses and Loss Claims
Business Source Summary Adjustments (BSAS)
Request a Tax Calculation
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
Prepare and Submit a Cumulative Update
Configuring your Cumulative Update Nominal Mappings
Cumulative Update - UK Property Reporting Categories
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