Can I file taxes before 31 January?

Yes – you can file your UK Self Assessment tax return before 31 January. Filing early is actively encouraged by HMRC and gives you several practical advantages.

HMRC online Self Assessment portal accepts returns at any time after the tax year ends on 5 April. Once the system opens for the new tax year (usually from mid-May), you can file your return for the previous year. There is no advantage to waiting – and significant risks.

When Can You File Early?

• The Self Assessment online system typically opens in mid-May following the end of the tax year
• For the 2025/26 tax year (6 April 2025 – 5 April 2026), you can file from approximately mid-May 2026
• There is no penalty for filing months in advance and it is entirely legitimate

Benefits of Filing Early

• Know your tax liability sooner: If you owe tax, you can budget or arrange payment before the deadline
• Avoid the last-minute rush: HMRC systems become slow in the days before 31 January
• Reduce penalty risk: Technical issues on deadline day are not accepted as a reasonable excuse – filing early avoids this entirely
• Pension and ISA planning: Once you know your tax position, you can make additional pension contributions before 5 April that reduce your current tax bill
• Payment on account accuracy: If your tax has changed significantly, you can apply to reduce your payments on account
• State benefit entitlement: Some benefits (e.g., Universal Credit) use your tax return data – earlier filing means earlier assessment

What Information Do You Need?

Before filing, you need all your income details: P60/P45 from employment; self-employment income and expense records; property income and allowable expenses; bank interest (up to GBP 1,000 is tax-free for most); dividend vouchers; capital gains details; and state pension/benefit records.

Can You File Before All Information Is Available?

You must file an accurate return. If documents are not yet available (e.g., P60 not issued by May), wait until you have them. You can estimate employment income based on payslips if delayed, but must correct before the deadline.

Records to Keep for Five Years

Keep payslips, P60s/P45s, bank statements, self-employment invoice and expense records, property tenancy agreements, investment dividend vouchers, and capital gains computations until at least 31 January 2032 for the 2025/26 return.

Common Myth: Filing Early Might Trigger an Audit

This is not supported by evidence. HMRC processes early returns in exactly the same way as deadline-day returns. There is no increased scrutiny for early filers – filing early and accurately demonstrates compliance.