Making Tax Digital for Income Tax / Lesson 7 of 7
The final declaration
Four updates done. This is the one that actually counts.
The short answer
- ✓ The final declaration settles the year and is functionally the annual return
- ✓ Employment, savings, dividends and reliefs are added at this stage, not quarterly
- ✓ It is due by 31 January following the end of the tax year
- ✓ Submitting four quarterly updates does not mean you have filed
What it is
The final declaration is where your tax year is settled. You confirm the figures from your quarterly updates, add everything the quarters did not cover, claim your reliefs, and declare that the position is complete and correct.
If that sounds like the Self Assessment return you already know, that is because functionally it is. The difference is that four summaries preceded it.
What gets added at this stage
| Included in quarterly updates | Added at the final declaration |
|---|---|
| Business income and expenses | Employment income and PAYE tax |
| Property income and expenses | Savings interest and dividends |
| Pension contributions and Gift Aid | |
| Capital allowances and accounting adjustments | |
| Losses brought forward | |
| Anything else on your wider tax position |
This is why quarterly updates cannot produce a tax figure. They only ever saw part of the picture.
The deadline
The final declaration is due by 31 January following the end of the tax year, the same date the Self Assessment return has always used. Payment remains due on 31 January, with the second payment on account on 31 July.
6 Apr tax year starts, digital records begin
4 x quarter summary updates through the year
5 Apr tax year ends
31 Jan final declaration submitted
31 Jan balancing payment plus first payment on account
31 Jul second payment on accountThe bit HMRC does not spell out
Completing all four quarterly updates does not mean you have filed. This is the most dangerous misunderstanding in the whole regime. It is entirely possible to submit four updates diligently, feel finished, and then miss the final declaration, which is the submission that carries the penalty.
Put 31 January in the calendar on the day you submit your fourth quarter, and treat the quarterly updates as progress rather than completion.
You have reached the end
You now know what MTD changes and what it leaves alone, how qualifying income is measured, when it reaches you, what digital records must look like, how to choose software sensibly, the quarterly rhythm, and how the year closes.
The exam covers all three modules. It is ten questions, and you can retake it as often as you like.
Common mistakes
- Believing four updates means you have filed. The final declaration is the filing.
- Expecting quarterly updates to include everything. They only cover business and property.
- Assuming the deadline moved. It is still 31 January.
- Leaving reliefs unclaimed. The final declaration is where pension relief and Gift Aid go in.
Try it on your own numbers
This is the same calculator as the full tool page, using 2026/27 rates.
Are you affected by MTD for Income Tax?
Enter your gross income (turnover/rent before expenses) - that's what HMRC counts.
HMRC adds your gross self-employment and property income together - not your profit.
Your result
What it means
What to do
Qualifying income is tested on your previous tax year's return, so a future threshold can pull you in even if this year is lower.
When does MTD for Income Tax apply?
It's phased in by income. Your band is highlighted.
| Qualifying income | Mandatory from | First tax year |
|---|---|---|
Under £20,000: not yet mandated - the government has said it will keep this under review. General partnerships are expected to join later.
Your MTD deadlines
From the tax year onwardNext deadline
What you submit each quarter
A cumulative summary of your business and property income and expenses, using MTD-compatible software. You get a running estimate of the tax due - but you don't pay until the normal Self Assessment date.
Late quarterly updates earn points under HMRC's points-based penalty system; enough points trigger a £200 penalty.
| Submission | Period covered | Deadline | Countdown |
|---|---|---|---|
Standard quarterly periods shown (you can elect calendar-quarter dates instead). The Final Declaration replaces the old Self Assessment return and is due 31 January after the tax year ends.
Create a free account to save these deadlines and get reminders.
What will MTD cost you?
You must use MTD-compatible software. Typical routes:
Some software is free for the simplest landlords/sole traders. Check HMRC's recognised-software list before you buy.
Key takeaways
- ✓ The final declaration settles the year and is functionally the annual return
- ✓ Employment, savings, dividends and reliefs are added at this stage, not quarterly
- ✓ It is due by 31 January following the end of the tax year
- ✓ Submitting four quarterly updates does not mean you have filed
Check you have got it
3 quick questions. No score is kept, and you can change your mind.
1. You have submitted all four quarterly updates. Have you filed for the year?
2. Where do pension contributions and Gift Aid get claimed?
3. When is the final declaration due?
Sources
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