MTD penalties for late filing: what UK sole traders face in 2026

Making Tax Digital penalties: the new points-based system

From 6 April 2026, self-employed people earning over £50,000 must file quarterly updates through Making Tax Digital for Income Tax Self Assessment (MTD ITSA). Miss a deadline, and HMRC's new points-based penalty system kicks in. It works differently from the old fixed penalties, and understanding it now saves you money later.

How the points system works

Every time you miss a filing deadline, you get a penalty point. Points accumulate over a set period. Once you reach the penalty threshold, you receive a £200 penalty for that late submission and every subsequent late submission until you bring your record up to date.

For quarterly filers (which includes most sole traders under MTD), the threshold is 4 points. With four quarters per year, that means missing every deadline in a single year triggers the penalty. Miss just one quarter and you get a point but no financial penalty yet.

Understanding the penalty thresholds

The penalty thresholds vary depending on how often you are required to file your returns. It's crucial to understand these thresholds to manage your submissions effectively:

Resetting your points

Points expire if you file on time for a set period (24 months for quarterly filers). You also need to have submitted all outstanding returns. You cannot reset just by paying the penalty; you need to demonstrate consistent compliance going forward.

Late payment penalties (separate from filing)

Late payment penalties are separate from late filing penalties. If you owe tax and do not pay on time:

• Up to 15 days late — no penalty
• 16 to 30 days late — penalty of 2% of the tax owed at day 15
• 31+ days late — 2% of tax owed at day 15, plus 2% of tax owed at day 30
• After 31 days — additional daily penalties at 4% per year on the outstanding amount

There is a de minimis rule: no late payment penalty if the tax owed is under £50.

What counts as a quarterly update?

Under MTD ITSA, you must submit a summary of your business income and expenses for each quarter through compatible software. The quarters follow the tax year:

• Q1: 6 April to 5 July — deadline 7 August
• Q2: 6 July to 5 October — deadline 7 November
• Q3: 6 October to 5 January — deadline 7 February
• Q4: 6 January to 5 April — deadline 7 May

You also need to submit a final declaration by 31 January following the end of the tax year (same as the current Self Assessment deadline).

How to avoid penalties

Set up calendar reminders for each quarterly deadline. Better still, use MTD-compatible software that tracks your income and expenses throughout the quarter, so filing is a matter of pressing a button rather than scrambling to gather three months of receipts.

Keep your records up to date weekly, not quarterly. A few minutes every Friday recording the week's income and expenses is far less painful than a frantic weekend before the deadline. Use the InvoiceAdept dashboard to track everything in one place.

Getting started with MTD ITSA

Transitioning to MTD ITSA may seem daunting at first, but breaking it down into manageable steps can make the process smoother:

1. Choose the right software: Select MTD-compatible software that suits your business needs. Consider features like ease of use, cost, and customer support.
2. Organise your records: Gather all necessary financial documents. Regularly update your records to prevent last-minute scrambles.
3. Test the system: Familiarise yourself with the software by inputting dummy data. This helps identify any issues before your actual submissions.
4. Schedule regular reviews: Set aside time each month to review your financial data. This ensures everything is accurate and up to date.
5. Seek professional advice: If you're unsure about any aspect of MTD ITSA, consider consulting an accountant or tax advisor.

Common mistakes to avoid

Even seasoned professionals can slip up with tax submissions. Here are some pitfalls to watch out for:

• Procrastination: Leaving submissions until the last minute can lead to errors and missed deadlines. Set regular intervals to update your records.
• Assuming compliance: Not all software is MTD-compliant. Double-check that your tools meet HMRC requirements.
• Ignoring updates: Tax regulations can change. Stay informed by regularly checking gov.uk for the latest updates.
• Overlooking details: Small errors in data entry can lead to bigger problems. Double-check numbers and dates before submission.
• Disregarding feedback: If HMRC provides feedback or requests additional information, respond promptly to avoid complications.

Practical examples of quarterly updates

To give you a clearer picture, let's consider a few examples of how different tradespeople might handle their quarterly updates:

• Electrician: Emily, an electrician, uses InvoiceAdept's invoice generator to manage her client billing. She exports her invoices directly to her MTD software to compile her quarterly report.
• Plumber: John, a plumber, reviews his expenses weekly using the VAT calculator to ensure accurate VAT submissions. His quarterly update includes material costs, travel expenses, and labour charges.
• Carpenter: Sarah, a self-employed carpenter, tracks her income and expenses using the day rate calculator. This helps her maintain accurate records for each project, simplifying her quarterly submissions.

FAQs

Do the new penalties apply to VAT too?

Yes. The points-based penalty system already applies to VAT returns filed on or after 1 January 2023. The same logic applies: accumulate points for late filings, pay £200 per late return once you hit the threshold.

What if I have a reasonable excuse for filing late?

HMRC recognises reasonable excuses including serious illness, bereavement, fire/flood, and HMRC system failures. Being too busy or forgetting is not a reasonable excuse. If you have a genuine reason, contact HMRC before the deadline if possible.

I earn under £50,000. Do these rules apply to me?

Not yet. MTD ITSA starts for those earning over £50,000 on 6 April 2026. Those earning over £30,000 join from April 2027. Below £30,000, there is no confirmed date yet, though HMRC intends to extend it eventually.

Can I appeal a penalty?

Yes, you can appeal against a penalty if you believe it was issued in error or if you have a reasonable excuse. The appeal process involves contacting HMRC and providing relevant evidence to support your claim. More details can be found on gov.uk.

What software options are available for MTD ITSA?

There are various MTD-compatible software options available, each with different features and pricing. When choosing, consider factors like ease of use, integration with existing systems, and customer support. Some software options may also offer free trials, allowing you to test them before committing.