Filing & Submissions

Filing & Submissions guides for self-employed.

Common Self Assessment Mistakes to Avoid

Learn the most common Self Assessment errors that trigger HMRC enquiries or penalties. Avoid these mistakes when filing your tax return to save time and money.

11 January 2026

7 min read

Filing Your First Self Assessment Tax Return

Step-by-step guide to filing your first Self Assessment tax return online. Learn what information you need, how to submit, and avoid common first-timer mistakes.

11 January 2026