For individuals
Personal tax
Income Tax, PAYE, National Insurance, pensions, savings, Capital Gains Tax and Inheritance Tax.
UK tax guidance
Find a clear answer to your UK tax question
Search practical guidance or browse by situation. Published guides are organised around the question you need to answer, with dates, limits and source information shown where they matter.
- Organised by tax question
- Applicable periods identified
- Primary sources explained
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Start with your situation
Search the site for a specific tax question, or choose a topic hub to see related guides, calculators and next steps together.
What do you need to understand?
Working for yourself
Self-employed
Getting started, allowable expenses, Self Assessment, National Insurance and side-hustle tax.
Running an organisation
Business and employers
Corporation Tax, VAT, payroll, employer duties, CIS and specialist business taxes.
Owning or renting property
Property and land
Rental income, property transaction taxes, Council Tax, ATED and ownership changes.
Cross-border or less common
International and specialist
Residence, foreign income and gains, historic remittance rules, crypto and specialist reliefs.
Digital record keeping
Making Tax Digital
Who may be affected, when requirements apply and how to prepare records and software.
How the library is organised
- Topic hubs group related questions, tools and next steps rather than relying on publication date.
- Each guide should answer one clear intent and state who and which period it covers.
- Where a question depends on individual facts, the guide should explain the boundary and routes to appropriate help.
Browse the library
Latest published guidance
Open a guide for its scope, applicable period, explanations and next steps. Use the search above when you have a specific question.
Self-employed
How to register as self-employed
Check when a sole trader must register as self-employed, the £1,000 gross-income test and the relevant Self Assessment dates.
Updated 9 September 2026
Self Assessment
How to register for Self Assessment
How to register or reactivate Self Assessment for 2025/26, with the 5 October 2026 notification date and next steps.
Updated 9 September 2026
Income Tax and PAYE
UK tax codes explained
Understand UK PAYE tax-code numbers and letters, including 1257L, BR, K and emergency markers, for the 2026/27 tax year.
Updated 9 September 2026
Self Assessment
Who needs to send a Self Assessment tax return?
Check who may need to file a 2025/26 Self Assessment return and what a new or returning filer should do by 5 October 2026.
Updated 9 September 2026
How information is handled
Check the basis of the answer
UKTH is the organisation publisher. Tax-critical statements are intended to identify their applicable period and rely on primary authority such as GOV.UK, HMRC guidance or legislation.