What Happens If You Miss an MTD Quarterly Update Deadline?

Missing an MTD quarterly update deadline is not the immediate disaster it might feel like. HMRC's penalty system for MTD for Income Tax is designed differently from the old late-filing surcharges — it's points-based, with financial penalties only kicking in after repeated failures. Here's exactly how it works.

The Points-Based Penalty System

HMRC introduced a points-based system for MTD late submissions rather than immediate fines. The logic is to distinguish between a genuine one-off mistake and persistent non-compliance.

How points accumulate:

• Miss a quarterly update → receive 1 penalty point
• Points accumulate on your record
• No financial penalty until you hit the threshold

The penalty threshold for quarterly filers:

• 4 penalty points = £200 financial penalty
• Each further missed submission after the threshold = additional £200 penalty

So if you miss one quarterly deadline — say, the 7 August submission — you receive one point. No fine. The following quarter, if you submit on time, your total stays at one point. Only if you miss four consecutive quarterly deadlines would a financial penalty arrive.

The Four Quarterly Deadlines

For MTD for Income Tax, there are four quarterly submission windows per year:

Quarter	Covers	Deadline
Q1	6 April – 5 July	7 August
Q2	6 July – 5 October	7 November
Q3	6 October – 5 January	7 February
Q4	6 January – 5 April	7 May

These dates are fixed. If a deadline falls on a weekend, plan to submit before it — HMRC does not automatically extend deadlines. Your accounting software should be able to remind you as each deadline approaches.

What "Missing" a Deadline Actually Means

A missed deadline means your quarterly update was not received by HMRC's systems by 11:59pm on the deadline date.

The quarterly update itself is not a detailed tax return — it is a summary of your income and expenses for that quarter. The figures do not need to be perfectly reconciled or audited at the time of submission; they are estimates that can be corrected in your end-of-period statement and final declaration.

If You've Already Missed One

If you've missed a quarterly deadline, the action steps are:

1. Submit as soon as possible. The submission is late, but submitting it now stops additional exposure. HMRC's systems register late submissions — they don't prevent you from catching up.

2. Check your penalty point total. You can view your penalty points through your HMRC online account or through your MTD software. Knowing your total tells you how much buffer you have.

3. Don't miss the next one. Points accumulate per missed deadline. Missing two in a row is not twice as bad as missing one — but it gets you closer to the 4-point threshold faster.

4. Consider reasonable excuse grounds. If there was a genuine reason you couldn't submit — serious illness, bereavement, HMRC system failure, your software provider had an outage — you may have grounds to appeal the penalty point. Act quickly on this.

How Points Expire

Penalty points don't accumulate indefinitely. Once you have good compliance for a sustained period, HMRC resets your record.

To clear points, you need 24 consecutive months of on-time submissions. That means 8 quarterly updates all filed by their deadlines.

After 24 clean months, your points return to zero and the clock resets. HMRC's stated policy is to encourage getting back into compliance rather than carrying a permanent mark for a difficult period.

Reasonable Excuse — When You Can Appeal

HMRC will remove a penalty point if you had a reasonable excuse for the late submission. Accepted grounds include:

• Serious illness or hospitalisation of the person responsible for submitting
• Bereavement of a close family member shortly before the deadline
• HMRC's own systems were unavailable on the deadline date
• Your MTD-compatible software had a confirmed technical failure
• You were a victim of a crime that affected your ability to submit

Not accepted as reasonable excuse:

• Not knowing about the deadline
• Being busy with business commitments
• Relying on someone else who failed to act
• Having an unresolved dispute with HMRC about your tax affairs

If you have a genuine reasonable excuse, submit your appeal promptly — within 30 days of the penalty notice where possible.

Avoiding the Problem: What Good Software Does

Most missed MTD quarterly updates are a calendar and workflow problem, not a record-keeping problem. The fix is having a system that reminds you and makes submission straightforward.

Good MTD-compatible accounting software will:

• Connect to your bank account via open banking and pull in transactions automatically
• Show your income and expenses updated in near real-time
• Send reminders as quarterly deadlines approach
• Submit to HMRC in a few clicks once you confirm the figures

If you're currently managing records in a spreadsheet and submitting manually, the risk of a missed deadline is higher. Our software chooser can help you find the right MTD-compatible tool for your situation — including free options if you bank with NatWest, RBS, Ulster Bank, or Mettle.

See our full MTD penalties guide for the complete breakdown of the penalty framework, including what happens if you also miss the end-of-period statement or final declaration.