Tax season in the UK brings with it both obligation and opportunity. For millions of taxpayers,navigating the self-assessment system can be confusing, especially with updated rules,changing digital processes, and evolving HMRC requirements in 2025.
Whether you’re a seasoned sole trader or filing for the first time, staying up to date on the latest tax rules and filing practices is crucial to avoid penalties and take full advantage of allowable reliefs
This article breaks down the 2025 UK tax filing process, recent changes from HMRC, and insider tips to help you file smarter
The self-assessment system allows individuals to report their income, claim allowable expenses, and pay tax directly to HM Revenue and Customs (HMRC). You are responsible for submitting your tax return if you're:
Tax is filed for the previous tax year. For example, the 2024/2025 tax year runs from 6 April 2024 to 5 April 2025. The deadline for online filing is 31 January 2026.
Staying current with HMRC updates is key to filing accurately. Here are the most notable changes in 2025:
1. Digital Expansion Under Making Tax Digital (MTD)
2. Updated Expense Categories for Sole Traders
3. Revised Late Penalty System
4. Adjusted Income Tax Bands (for England, Wales, and Northern Ireland)
5. Expanded Help-to-Save Scheme Eligibility
Step 1: Register with HMRC
Step 2: Keep Digital Records
Under MTD, you must use software (like QuickBooks, Xero, or Selftax) to record your income and expenses in real time.
Step 3: Prepare Your Income & Expenses
Gather all sources of income:
And organise your deductible expenses:
Step 4: Log In and Complete Your Return
Use HMRC's portal or Selftax to enter your details section by section. Validate everything before submitting.
Step 5: Review & Submit Before Deadline
Deadline for online submission: 31 January 2026
Step 6: Pay Your Tax Bill
You can pay by:
1. File Early
2. Use Approved Software
3. Double-Check Personal Information
4. Understand What You Can Claim
5. Keep Five Years of Records
6. Use the Payment on Account Feature
Selftax is built for modern UK taxpayers who want to file fast and stress-free:
Whether you're self-employed, a landlord, or managing multiple income streams, Selftax simplifies compliance.
The 2025 UK tax filing process includes a mix of digital upgrades, policy adjustments, and stricter penalties. But with the right tools and a proactive mindset, filing your tax return doesn't have to be a burden.
Stay informed, keep your records up-to-date, and consider using a simple online solution like Selftax Blog to handle everything with ease.