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MTD Income Tax
MTD VAT
Self-Assessment
Why am I getting an "authentication failure" error when submitting?
Modified on Thu, 11 Dec, 2025 at 3:51 PM
How do I amend a previously submitted return?
Modified on Thu, 11 Dec, 2025 at 3:57 PM
Why isn't my personal allowance showing in the tax calculation?
Modified on Thu, 11 Dec, 2025 at 3:32 PM
How do I enter payments on account in my self-assessment?
Modified on Thu, 11 Dec, 2025 at 3:24 PM