This trusted handbook shows you exactly how to complete your Self Assessment tax return for 2025/26, understand updated UK income tax rules and deal confidently with HMRC. The Telegraph Tax Guide 2026 gives you clear, step-by-step guidance to complete your return accurately and on time. Fully updated after the 2025 Budget changes, it helps you reclaim your time, avoid penalties and claim every allowance. The UK's bestselling tax handbook, this essential guide translates complex rules into plain English. It includes worked illustrations, key updates from the 2025 Budget and Treasury Statements, and practical tips for dealing effectively with HM Revenue and Customs. Whether you're self-employed, employed, part time, full time or retired, it explains what applies to you, including how living or working abroad affects the tax you pay. You'll learn what records you need, what you can claim, and how to make the system work for you. Understand allowances, reliefs, capital gains, National Insurance and residency rules so you can submit your return with confidence and peace of mind. Make this the year your tax return is simple, accurate and stress-free. Themes include: 2025 Budget and Treasury updates, Self Assessment step by step, HMRC responses and compliance, allowances and tax-saving opportunities, residency and working or living abroad, practical checklists for employed self-employed and retired readers.