For years, most self-employed people in the UK only had one major tax deadline burned into their brain.
31 January.
That was the big one. The annual panic. The late-night spreadsheet session. The moment receipts suddenly became important again.
But under Making Tax Digital for Income Tax (MTD ITSA), things are changing.
From April 2026, many sole traders and landlords moved onto a system of quarterly tax updates, meaning there is no longer just one important tax deadline each year.
There are several.
And naturally, one question keeps coming up:
What actually happens if you miss one?
The answer is more interesting than most people realise.
First: What Is a Quarterly MTD Update?
Under the new MTD system, affected taxpayers need to:
- • keep digital records
- • use MTD-compatible software
- • send updates to HMRC every quarter
These updates summarise:
- • income
- • expenses
- • estimated profit
The system replaces the old once-a-year reporting style with more regular digital submissions.
Official guidance is available from gov.uk/making-tax-digital.
Why People Will Miss Deadlines
If we are being realistic, a lot of people are going to miss at least one quarterly deadline.
Not because they are careless.
Because life happens.
Most sole traders are already juggling:
- • customer work
- • invoices
- • admin
- • cashflow
- • family life
- • rising costs
Adding multiple tax deadlines each year inevitably increases the chance of one slipping through the cracks.
Especially for businesses that are used to thinking about tax once per year.
The Important Bit: The Penalty System Is Changing
This is where things get interesting.
Under the current Self Assessment system, missing a tax return deadline usually triggers an immediate financial penalty.
MTD works differently.
Instead of instant fines, HMRC has introduced a points-based penalty system for late submissions.
Think of it slightly like driving licence penalty points.
Miss one deadline and you may not receive a fine immediately.
Instead, you receive a penalty point.
How the MTD Penalty Points Work
Each missed quarterly submission can generate a penalty point.
Once enough points build up, a financial penalty is triggered.
For quarterly submissions, the threshold is:
| Filing frequency | Points threshold |
|---|---|
| Quarterly | 4 points |
| Monthly | 5 points |
| Annually | 2 points |
Once the threshold is reached:
- • a £200 penalty is issued
- • further missed deadlines can trigger additional penalties
The important thing is that missing one update does not automatically create a massive fine straight away.
There’s Also a “Soft Landing” Period
This is the detail many people have completely missed.
HMRC has indicated that taxpayers joining MTD in April 2026 receive a form of soft landing period during the first year for quarterly updates.
In practice, this means the early stages are expected to focus more on helping businesses adapt rather than immediately issuing penalties for every mistake.
That does not mean deadlines should be ignored.
But it does suggest HMRC understands the transition may be messy at first.
Why Missing Updates Still Matters
Even without immediate fines, repeatedly missing quarterly updates creates problems.
1. Penalty Points Accumulate Quietly
This is the danger.
A lot of people may assume:
- • “Nothing happened last time”
- • “I’ll sort it later”
Then suddenly:
- • multiple missed updates
- • points threshold reached
- • penalties triggered
The risk builds gradually.
2. Bookkeeping Gets Harder Again
One of the goals of MTD is encouraging regular record-keeping.
If quarterly updates are skipped repeatedly, businesses often drift back into:
- • annual panic mode
- • missing receipts
- • rushed bookkeeping
Which recreates many of the same problems the new system is trying to solve.
3. Future HMRC Interactions Become More Stressful
Consistent missed deadlines can increase compliance attention over time.
Businesses with organised records and regular submissions are generally viewed as lower risk.
The Real Problem Is Habit Change
The biggest challenge with MTD is not technology.
It is behaviour.
For decades, many sole traders operated on a simple rhythm:
- • work all year
- • think about tax in January
MTD breaks that cycle.
Now tax administration becomes something that happens throughout the year.
For businesses already keeping monthly records, this may feel manageable.
For businesses still relying on paper receipts in carrier bags, it could feel like a much bigger adjustment.
What Sole Traders Should Actually Do
The smartest approach is not complicated.
Keep records monthly, not yearly
This alone solves most MTD stress.
Use software that simplifies submissions
Modern bookkeeping tools increasingly automate large parts of the process.
Treat quarterly updates like invoice deadlines
Businesses rarely forget invoices because they affect cashflow immediately.
MTD deadlines need to become part of that same routine.
Don’t panic if you miss one
This is important.
A missed quarterly update is usually fixable.
The worst approach is often avoiding the issue entirely because it feels stressful.
The Bigger Shift Happening Behind the Scenes
MTD is part of a wider trend in UK tax.
The direction is clear:
- • more digital reporting
- • more real-time data
- • fewer once-a-year reconciliations
- • greater automation
Quarterly updates are not really the end goal.
They are one step towards a tax system built around continuous digital visibility.
Summary
Under Making Tax Digital, missing a quarterly update no longer triggers the same immediate penalty structure used in traditional Self Assessment.
Instead, HMRC uses a points-based system, where missed submissions accumulate penalty points before financial penalties are applied.
For quarterly reporting, the threshold is four missed submissions before a £200 penalty is triggered.
There is also a temporary soft-landing period during the early stages of rollout that began in April 2026.
The key challenge for many sole traders is not the technology itself, but adapting from annual tax habits to more regular digital reporting throughout the year.