MTD ITSA Penalties: What Sole Traders Need to Know in 2026

Why the Penalty Rules Have Changed

MTD ITSA introduced a completely new penalty framework that replaced the old fixed penalty system. HMRC has moved to a points-based model for late filing and a percentage-based model for late payment. The two systems work independently, so you can face penalties under both at the same time if you miss a deadline and fail to pay on time.

How the Late Filing Points System Works

Every time you miss a submission deadline under MTD ITSA, HMRC adds one penalty point to your account. Once your points total reaches a set threshold, a fixed £200 financial penalty is charged. Further £200 penalties are added for each subsequent missed submission after you hit the threshold.

• Quarterly updates: The threshold is 4 points before a financial penalty applies.
• Annual end-of-period statement: The threshold is 2 points.
• Final declaration: The threshold is 2 points.

Points expire automatically after 24 months, provided you have met all your submission obligations during that period. HMRC will not reset your points until you have filed everything on time for a sustained period, so falling behind repeatedly keeps your point count alive for longer than you might expect.

How the Late Payment Penalty Works

The late payment penalty is separate from the points system and is calculated as a percentage of the tax you owe. It applies in two stages.

• First penalty: 2% of the unpaid tax if the amount is still outstanding 15 days after the payment deadline.
• Second penalty: A further 2% (making 4% total) if the tax remains unpaid at 30 days after the deadline.
• Daily penalties: After 31 days, an additional penalty of 4% per year accrues daily on the outstanding balance until you pay in full.

This means a tax bill of £5,000 left unpaid for 31 days would already attract a £200 penalty before the daily rate begins. The longer you leave it, the more expensive it becomes.

Interest on Top of Penalties

Penalties are not the only cost of paying late. HMRC also charges late payment interest on any unpaid tax from the day after the deadline. As of August 2026, the interest rate is linked to the Bank of England base rate plus 2.5 percentage points. Interest and penalties run simultaneously, so they stack up quickly on larger bills.

What Counts as a Reasonable Excuse

HMRC will cancel penalty points or financial penalties if you have a reasonable excuse for the late submission or payment. Acceptable reasons typically include a serious illness, bereavement of a close family member, or a genuine HMRC system failure. Simply forgetting, being too busy, or relying on someone else who failed to act for you is unlikely to qualify. You must appeal within 30 days of receiving the penalty notice and provide evidence.

Practical Steps to Avoid Penalties

• Set calendar reminders for each quarterly update deadline: 7 August, 7 November, 7 February, and 7 May.
• Keep your bookkeeping current throughout the quarter so submissions are straightforward.
• Use HMRC's Time to Pay service if you cannot pay on time. Agreeing a plan before the deadline can prevent late payment penalties from applying.
• Check your penalty points balance through your HMRC online account regularly.
• If you receive a penalty notice, act within 30 days to appeal or pay to avoid further charges.

The Bottom Line

The new MTD ITSA penalty regime is designed to encourage consistent, on-time compliance rather than penalise occasional slips harshly. However, the combination of points-based filing penalties, percentage-based payment penalties, and daily interest means that ignoring deadlines becomes very costly very quickly. Staying organised and filing each quarterly update on time is by far the cheapest approach.