The UK tax year runs from 6 April to 5 April each year.
The 2025/26 tax year is from 6 April 2025 to 5 April 2026.
Self-employed individuals can start preparing and filing their tax return from April 2026 onwards, once the tax year has ended.
Understanding the UK Tax Year
The UK does not follow the calendar year for tax purposes. Instead, it follows a financial year that runs from April to April.
2025/26 Tax Year: 6 April 2025 ® 5 April 2026
2026/27 Tax Year: Starts from 6 April 2026
This applies to:
- Self-employed individuals
- Freelancers and contractors
- Landlords earning rental income
When Can You Start Filing Your 2025/26 Tax Return?
You can begin your self-assessment tax return:
- From April 2026 onwards
- Once all income and expenses are finalised
Filing early helps you:
- Avoid last-minute stress
- Plan your tax payments in advance
- Identify potential tax savings
What You Need to Prepare Before Filing
To complete your tax return accurately, you should gather:
- Income records (sales, invoices, rental income)
- Business expenses and receipts
- Bank statements
- Payroll records (if applicable)
- Previous tax return details
Why Early Preparation Matters
Many taxpayers leave their returns until the deadline, which can lead to:
- Errors and missed claims
- Unnecessary penalties
- Cash flow issues
Starting early gives you better control and peace of mind.
Common Mistakes to Avoid
- Missing allowable expenses
- Incorrect income reporting
- Poor record keeping
- Filing close to the deadline
- Ignoring HMRC notices
FAQ
When does the UK tax year start and end?
The UK tax year runs from 6 April to 5 April the following year.
When can I file my self-assessment tax return?
You can start filing your tax return after the tax year ends in April, with the deadline usually in January the following year.
Do I need to file a tax return every year if I'm self-employed?
Yes. Self-employed individuals must submit a self-assessment tax return each year to HMRC.
What happens if I file my tax return late?
Late filing can result in penalties, interest charges, and additional scrutiny from HMRC.
Conclusion
Understanding the UK tax year helps you stay organised and compliant.
With the 2025/26 tax year ending in April 2026, now is the ideal time to:
- Organise your financial records
- Prepare your tax return early
- Avoid last-minute stress and penalties
Need Help with Your Tax Return?
P & K Group provides expert support for self-employed individuals, landlords, and small businesses—helping you file accurately and on time.