Four Quarterly Update Deadlines HMRC Will Not Forgive
Miss one HMRC quarterly update deadline and the penalties start immediately. Here is exactly when each deadline falls and what it costs you to be late.
Four dates a year. That is the bargain HMRC is offering sole traders under Making Tax Digital for Income Tax (MTD ITSA), which becomes mandatory from April 2026. Submit four quarterly updates, keep digital records, and in return you get a clearer picture of your tax liability before the final bill arrives. Sounds reasonable. Until you realise that those four quarterly update deadlines are fixed, non-negotiable, and attract penalties from the very first day you miss them.
This post is not another overview of what MTD is. It is a precise, calendar-ready breakdown of when your HMRC quarterly update deadlines fall, what happens if you miss them, and the one habit that makes the whole system survivable.
- MTD ITSA quarterly updates are mandatory from April 2026 for sole traders earning above £50,000, and from April 2027 for those earning above £30,000.
- There are four quarterly update deadlines per tax year, each falling one month after the end of the quarter.
- Missing a deadline triggers HMRC's points-based penalty system; four late submissions in a year can cost you £200 in fines.
- You can choose calendar quarter deadlines or period-end dates aligned to the tax year; the choice affects every deadline that follows.
- Submitting through compliant MTD software is the only accepted method; email or phone will not satisfy the requirement.
What Exactly Is a Quarterly Update?
- MTD Quarterly Update
- A digital submission made to HMRC every three months under Making Tax Digital for Income Tax. It summarises your income and expenditure for that period. It is not a tax payment; it is a reporting obligation that replaces the annual Self Assessment cycle with four interim snapshots plus a final declaration.
The quarterly update is not a tax return. You are not paying anything when you submit it. You are simply telling HMRC: here is what came in, here is what went out, here is the running total. Think of it as four progress reports before the end-of-year exam. HMRC uses the data to give you an estimated tax liability throughout the year, which is genuinely useful if you are setting money aside.
What makes it consequential is the enforcement mechanism attached to it. HMRC has built a points-based penalty system specifically for MTD obligations. Every late submission earns one penalty point. Accumulate four points and you are charged a £200 fine. After that, every further late submission adds another £200. There is no grace period baked into the system by default.
The Four Quarterly Update Deadlines HMRC Sets
Here is where it gets practical. HMRC offers sole traders two sets of quarterly periods to choose from.
Option 1: Standard Quarterly Periods (Tax Year Aligned)
These follow the UK tax year, which runs from 6 April to 5 April.
| Quarter | Period Covered | Submission Deadline |
|---|---|---|
| Q1 | 6 April to 5 July | 5 August |
| Q2 | 6 July to 5 October | 5 November |
| Q3 | 6 October to 5 January | 5 February |
| Q4 | 6 January to 5 April | 5 May |
Option 2: Calendar Quarter Periods
These align to the end of each calendar month, which suits sole traders whose bookkeeping already follows standard accounting periods.
| Quarter | Period Covered | Submission Deadline |
|---|---|---|
| Q1 | 6 April to 30 June | 31 July |
| Q2 | 1 July to 30 September | 31 October |
| Q3 | 1 October to 31 December | 31 January |
| Q4 | 1 January to 5 April | 5 May |
The final Q4 deadline is the same regardless of which option you choose: 5 May. The rest differ by roughly a month. Most accountants recommend the calendar quarter option simply because it is easier to remember: 31 July, 31 October, 31 January, 5 May.
Why These Dates Catch People Out
Look at that list again. The 31 October deadline falls in the same window as the paper Self Assessment deadline. The 31 January deadline is the existing online Self Assessment deadline, the single date every sole trader already dreads. Under MTD, that date now carries a quarterly update submission on top of the final declaration for the previous tax year.
For a plumber turning over £60,000, January already means chasing unpaid invoices, sorting materials receipts from the back of a van, and scraping together a tax payment. Adding a quarterly update deadline to that pile is not administrative tidying. It is a legitimate extra burden, and pretending otherwise is the kind of wishful thinking that leads to penalty points.
The 5 August deadline, in the tax-year-aligned option, falls in the school summer holidays. August is the month when self-employed tradespeople are either flat out on jobs or trying to take a week off with their families. HMRC's quarterly update calendar was not designed around the rhythms of a sole trader's working year. It was designed around a tax year that dates back to 1752.
The Points Penalty System Explained Plainly
HMRC introduced the points-based penalty system under the Finance Act 2021. It works like penalty points on a driving licence, except the consequences arrive faster.
Miss one quarterly update deadline: one point. Miss a second in the same obligation period: two points. By the time you have four points, you have triggered a £200 charge. Unlike a speeding fine, you cannot simply pay and reset. Points only expire after you have submitted on time for a sustained period (12 months of consecutive compliant submissions, per HMRC's current guidance) and your points balance is already below the threshold.
For a sole trader with four quarterly obligations per year, reaching four points means missing every deadline in a 12-month period. That sounds unlikely, but consider the profile of a sole trader who is genuinely busy: a heating engineer who goes full-pelt from October to February, a freelance photographer who loses track of admin during peak season. Four missed deadlines across a year is not rare; it is the predictable consequence of a system with no built-in reminders and no forgiveness for the first three failures.
Once you have crossed the £200 threshold, each additional late submission in that obligation period costs another £200. Miss all four in a second year and you are looking at £800 in penalties on top of any late payment interest on the tax itself.
What You Actually Have to Submit
Each quarterly update must include:
- Total income for the period, categorised by source (self-employment, property, etc.)
- Total allowable expenses, broken down by HMRC's categories (materials, travel, professional fees, and so on)
- Submitted through HMRC-approved MTD software
There is no paper option. There is no email option. You cannot phone HMRC and read out your figures. The entire point of Making Tax Digital is that the data flows digitally from your records into HMRC's systems. This is why the best MTD software for sole traders matters more than it might seem. The software is not an optional convenience; it is the only legal route to compliance.
The quarterly update does not require you to calculate your tax liability. HMRC's systems do that from the figures you submit and return an estimate to you. That estimate is not a bill; no payment is triggered by submitting a quarterly update. Payment still happens in January (and a second payment on account in July, if applicable).
The Final Declaration and How It Differs
After the fourth quarterly update, you submit a final declaration. This is the MTD equivalent of your Self Assessment tax return. The deadline is 31 January following the end of the tax year, the same date as the current Self Assessment deadline.
The final declaration is where you:
- Confirm or correct the figures from your four quarterly updates
- Add any income sources not covered by the quarterly updates (dividends, savings interest, etc.)
- Claim any reliefs or allowances not included during the year
- Crystallise your tax liability
Think of the four quarterly updates as rough drafts and the final declaration as the published version. If you have been submitting accurate figures throughout the year, the final declaration should take minutes. If you have been submitting estimates and tidying up later, the final declaration becomes the correction exercise.
For a fuller breakdown of how the final declaration interacts with your annual obligation, see MTD Income Tax Self Assessment Deadline Explained.
Two Scenarios That Show Why Deadlines Bite
Scenario 1: The Electrician Who Missed Two
Dan is a self-employed electrician earning £58,000 a year. He registers for MTD in April 2026. He submits Q1 on time (31 July). He gets busy in September and forgets Q2, missing the 31 October deadline by three weeks. That is one penalty point. He submits Q3 on time. He misses Q4 because the 5 May deadline slips his mind during a busy spring. Two points.
At two points, no fine yet. But two points means Dan is halfway to a £200 penalty and his points do not reset until he has maintained 12 consecutive months of compliant submissions. If he repeats this pattern in year two, he hits four points, receives a £200 fine, and any further lateness costs £200 per submission.
Scenario 2: The Freelancer Who Chose the Wrong Quarter Option
Sarah is a freelance copywriter earning £52,000. She chose the tax-year-aligned quarters without fully understanding the dates. Her Q3 deadline is 5 February, not 31 January, which she assumed it was because she confused it with the Self Assessment deadline. She submits on 1 February, thinking she is four days early. Under tax-year-aligned quarters, she was actually four days late. One penalty point, and a frustration entirely caused by a system with two sets of dates running simultaneously.
The lesson is not that Sarah made a mistake. The lesson is that a system offering two different sets of quarterly deadlines, one of which mimics dates already embedded in the national consciousness, is a system designed to trip people up.
How to Make All Four Deadlines Without Thinking About It
The sole traders who find MTD manageable share one habit: they do not treat the quarterly update as a deadline-day scramble. They treat it as a five-minute monthly review that takes almost no time on the actual deadline.
If you categorise income and expenses as they happen (or once a week, during a coffee break on Friday), the quarterly update is simply a submission button. The data is already there. This is what MTD software is supposed to enable: you photograph a receipt, it is categorised, it sits in the correct period, and on deadline day you review and submit.
The trap is treating the quarterly update like a mini tax return to be assembled from scratch every three months. That approach guarantees you will miss deadlines. It also means you will hate the process and resent the obligation, which is fair but unhelpful.
For practical guidance on choosing software that makes this friction-free, TapTax vs Xero: Which One Actually Fits a Sole Trader? is worth ten minutes of your time.
Which Quarter Option Should You Choose?
If your bookkeeping currently follows calendar months (most accounting software defaults to this), choose calendar quarters: 31 July, 31 October, 31 January, 5 May. They are easier to remember and align with how most sole traders already track their money.
If you use an accountant who works to the tax year, ask them before you register. Your choice of quarterly period affects every deadline you face for the life of your MTD registration. Changing it later requires notifying HMRC and can create a messy transitional period.
Either way, set four calendar reminders now, two weeks before each deadline. Not on the deadline day. Two weeks before. That buffer is the difference between a five-minute submission and a panicked scramble.
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The Bigger Picture
MTD's quarterly update deadlines are not going away, and HMRC has shown no appetite for softening the penalty regime that underpins them. The April 2026 start date for higher earners is confirmed. The April 2027 extension to £30,000-plus earners follows. If you are a sole trader earning above those thresholds, these four dates per year are now part of the fixed structure of your financial life.
The irony is that quarterly reporting, done properly, is genuinely less stressful than one enormous annual reckoning. But "done properly" requires the right tools, a clear calendar, and a realistic understanding of when each deadline actually falls. Not when you think it falls. Not when it would be convenient for it to fall. When HMRC says it falls.
You asked at the start what the bargain was. Four quarterly update deadlines in exchange for no more year-end panic. Hold up your end, and the system works. Miss one, and the points clock starts ticking. Set those four reminders today, before you close this tab.
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