Updating your tax details in the UK has become more important than ever in 2026. With major changes introduced by HM Revenue and Customs (HMRC), including the rollout of digital tax systems, keeping your information accurate is essential to avoid overpaying tax, penalties, or compliance issues. This complete guide explains how to update your tax details in the UK as of April 2026, who needs to update them, step-by-step instructions, and the latest changes affecting taxpayers.
Understanding the UK Tax Year (2026 Update)
Before updating your tax details, it’s important to understand how the UK tax system works.
The UK tax year runs from 6 April to 5 April the following year.
The 2026/27 tax year started on 6 April 2026, bringing updated tax rules, thresholds, and digital requirements.
For example:
- Personal Allowance remains £12,570
- PAYE threshold starts at £242 per week
- Emergency tax code remains 1257L
These figures affect how much tax you pay and make it critical to keep your details updated.
Why Updating Your Tax Details Is Important
Failing to update your tax details can lead to:
Overpaying or underpaying tax
If your income changes and HMRC is not informed, you may pay too much or too little tax.
Incorrect tax code
Your tax code determines how much tax is deducted from your salary.
Penalties and compliance issues
Especially relevant with new digital tax reporting rules in 2026.
Missing important HMRC notifications
HMRC is moving toward a “digital-first” communication system, meaning updates may be sent online rather than by post.
What Tax Details You Need to Update
You should update HMRC if any of the following change:
1. Employment and Income
- New job
- Pay rise or bonus
- Overtime changes
- Starting or stopping work
HMRC specifically requires updates if your income changes significantly.
2. Address and Personal Information
If you move house, you must update your address through your HMRC account.
3. Pension Details
Changes to pension income can affect your tax band and allowances.
4. Benefits and Allowances
- Marriage Allowance
- Child Benefit
- Company benefits (car, healthcare, etc.)
5. Self-Employment or Rental Income
This is especially important in 2026 due to new digital rules.
Major 2026 Change: Making Tax Digital (MTD)
One of the biggest changes to UK tax in April 2026 is Making Tax Digital for Income Tax (MTD ITSA).
What is Making Tax Digital?
It’s a system requiring taxpayers to:
- Keep digital records
- Submit quarterly updates
- Use approved software
From April 2026:
- Applies to those earning over £50,000 from self-employment or property
Who Needs to Update Tax Details Under MTD?
You must update and maintain accurate digital records if you are:
- Self-employed
- A landlord
- Earning over £50,000
By 2027, the threshold drops to £30,000.
Why This Matters
This reform changes tax reporting from:
Annual returns
To quarterly updates
This means your tax details must always be up to date.
Step-by-Step: How to Update Tax Details in the UK
Step 1: Create or Access Your Personal Tax Account
Go to your HMRC online account.
You can:
- Check income
- Update details
- View tax code
HMRC states you must sign in to update your information securely.
Step 2: Check Your Current Tax Information
Inside your account, review:
- Estimated income
- Tax code
- Employer details
This helps identify errors.
Step 3: Update Your Income Details
If your income changes:
- Enter new estimated income
- Update job details
This ensures correct tax calculations.
Step 4: Update Personal Details
You can update:
- Address
- Contact details
- Bank information
This is essential for receiving refunds or notices.
Step 5: Notify HMRC of Specific Changes
Depending on your situation, you may need to:
- Submit a Self Assessment
- Register as self-employed
- Update benefits
Step 6: Use the HMRC App (Optional)
HMRC also offers a mobile app where you can:
- Check tax codes
- Update income
- View notifications
How Employees Update Tax Details (PAYE)
If you are employed:
Your employer handles most updates
But you must:
- Check your tax code
- Inform HMRC of changes
You can update:
- Estimated income
- Benefits
- Additional jobs
How Self-Employed Individuals Update Tax Details
If you are self-employed:
You must:
- Register for Self Assessment
- Submit annual tax returns
From April 2026:
- Use digital software if income exceeds £50,000
- Submit quarterly updates
Example
If you earn £55,000 from freelancing:
- You must join MTD
- Submit updates every 3 months
- Maintain digital records
Deadlines You Must Know (2026)
Important deadlines include:
- Tax year ends: 5 April 2026
- Online tax return deadline: 31 January 2027
Under MTD:
- First quarterly update due: August 2026
Common Mistakes to Avoid
1. Not updating income changes
This can result in incorrect tax bills.
2. Ignoring tax code notices
Always review your tax code carefully.
3. Missing digital requirements (MTD)
Failure to comply can lead to penalties.
4. Not checking your HMRC account regularly
Important updates are increasingly digital.
Tips to Stay Compliant in 2026
Check your tax account regularly
Keep records of income and expenses
Use digital tools if required
Respond to HMRC notifications quickly
When to Contact HMRC
You should contact HMRC if:
- You cannot access your account
- Your tax code is wrong
- You need help updating details
Future of Tax in the UK
The UK tax system is moving toward full digitalisation.
Key trends include:
- Quarterly reporting
- Reduced paper communication
- Increased automation
From April 2026, HMRC is pushing a digital-first approach, meaning taxpayers must adapt to online systems.
Conclusion
Updating your tax details in the UK in April 2026 is no longer optional—it is essential for staying compliant and avoiding costly mistakes.
With the introduction of Making Tax Digital and the shift toward online communication, taxpayers must take a proactive approach.
Key Takeaways:
- Always keep your income and personal details updated
- Use your HMRC account regularly
- Prepare for digital tax reporting if self-employed
- Act quickly when your circumstances change
By staying organised and informed, you can ensure your tax affairs remain accurate, efficient, and compliant in the evolving UK tax system.