Published 20 May 2026. If you are a sole trader or landlord with qualifying income above £50,000 and you were mandated into Making Tax Digital for Income Tax Self Assessment on 6 April 2026, your very first quarterly submission is due on 7 August 2026. That is roughly eleven weeks from today. Most of the owners I speak with in this cohort have either underestimated what the submission actually requires, or are running a setup that will not survive it. This guide is what I would tell anyone in that position if they sat down opposite me this afternoon.
There is no soft launch. There is no informal first quarter. The points-based penalty meter starts ticking from 7 August, and HMRC has been explicit that the first cohort will not be granted blanket easement. If you are caught by the £50,000 threshold, this article is for you.
Who is caught by the 7 August 2026 deadline
MTD ITSA went live on 6 April 2026 for individuals with qualifying income over £50,000. Qualifying income means gross income — turnover before expenses — from self-employment plus property, as reported on your most recent filed Self Assessment return (for the April 2026 mandation, that is 2024/25, filed by 31 January 2026).
- Sole traders with gross trading income above £50,000.
- Landlords — UK or overseas property — with gross rental income above £50,000.
- Combined — if your sole trade plus your rental property together exceed £50,000, you are in, even if neither income source individually crosses the threshold.
- Both partners in a jointly-let rental are each measured against the threshold on their own share of the gross income, not the property's total.
If you are below £50,000 you are not yet mandated — the £30,000 cohort follows in April 2027 and the £20,000 cohort in April 2028. Partnerships are not yet in scope at all. Limited companies are unaffected; corporation tax MTD has not been scheduled. HMRC's eligibility guidance is the authoritative source on who is caught.
If you are unsure whether you are caught, our MTD ITSA readiness survey walks you through the threshold logic in three minutes and flags whether your current setup will survive a quarterly submission.
What the first quarterly submission actually is
The first quarter under MTD ITSA covers the period 6 April 2026 to 5 July 2026. The submission is due one month and seven days after the quarter end — hence 7 August 2026. You file separately for each income source: one sole trade is one submission; sole trade plus one rental is two submissions; sole trade plus two rentals is three submissions, all due the same day.
The submission itself is a quarterly update of totals, broken down by HMRC category — income totals and expense totals across the standard cash-basis or accrual categories. It is not a full return. You are not declaring a tax liability yet. What you are doing is telling HMRC, line by line, what came in and what went out for the quarter, drawn directly from digital records kept in functional compatible software, with a digital link preserved end-to-end.
What it is not:
- It is not a tax payment. Tax is still settled annually via the Final Declaration in the following January.
- It is not an estimate. The expectation is that the figures match your underlying digital records — re-keyed numbers from a spreadsheet break the digital link.
- It is not optional, and there is no "sole trader exemption" if your figures are simple. Simplicity does not buy you out of the regime.
For a full walk-through of the four quarterly windows and what each one covers, see our MTD ITSA quarterly calendar.
The points-based penalty regime, in plain English
This is the part most owners do not yet understand, and it is the part that will hurt the cohort that drifts through the first quarter unprepared. HMRC's points-based penalty system applies to MTD ITSA quarterly submissions on the same principles already in force for MTD VAT.
| What happens | The consequence |
|---|---|
| You miss one quarterly submission deadline | One penalty point added to your record. No cash penalty yet. |
| You hit the threshold of four points (quarterly cadence) | A £200 financial penalty is charged automatically. |
| Every further late submission while at the threshold | Another £200 charge, per submission. |
| Late payment of tax at the Final Declaration | Separate late-payment penalties and interest, on top of points. |
| You file on time for 24 months and clear the backlog | Points are reset to zero. The slate is genuinely wiped. |
Two important wrinkles. First, points accrue per submission obligation, not per taxpayer — a sole trader with two rental properties has three obligations every quarter, so a single quarter's chaos can earn three points at once. Second, the threshold is four points for quarterly cadence; once you hit it, every late submission is a £200 charge until you clear the 24-month clean-record window. The maths means a disorganised first year can produce a £600–£1,200 cash penalty before the Final Declaration even arrives.
What to do right now — an 11-week checklist
If your records are already in MTD-compatible software with a working bank feed, you are in good shape and the work between now and 7 August is review and rhythm. If your records are not, the next eleven weeks need to be deliberate.
- This week — confirm your MTD-compatible software. Check the HMRC list of compatible software. FreeAgent, Xero and QuickBooks all qualify. If you are running a spreadsheet, decide whether to migrate or to add HMRC-approved bridging — the former is almost always the right answer.
- Week 2 — sign up for MTD ITSA. You need to enrol with HMRC separately from your existing Self Assessment registration. Use the government sign-up service. Enrolment takes a few days to confirm; do not leave this to July.
- Weeks 3–4 — clean up your chart of accounts and bank feed. Connect your business bank and any payment processors. Build categorisation rules for your top 20 recurring transactions. Separate allowable from disallowable expenses now, not in arrears.
- Weeks 5–8 — reconcile April, May and June as they close. Each month must be fully bank-reconciled, every transaction categorised, no "uncategorised" balance. This is the work the first quarterly submission will rest on.
- Weeks 9–10 — do a dry run. Generate the quarterly figures from your software. Sanity-check income against your bank deposits. Sanity-check expenses against your card statement. Reconcile any gaps.
- Week 11 (by 7 August) — submit. File the quarterly update through your compatible software, one submission per income source. Save the confirmation references.
If you are starting from a backlog — books behind, no software, mixed personal and business spend — the eleven-week window is tight but workable. A focused bookkeeping cleanup followed by a clean software setup is the standard route. The earlier you start, the less the first quarter will feel like a fire drill.
The four most common traps
From the conversations I have had with owners in the £50K+ cohort over the last two months, these are the failure modes I see again and again.
- Assuming your accountant has it in hand. Many UK accountants are still light on MTD ITSA in practice — they will file your Self Assessment in January, but the quarterly cadence is a different operating model. If your accountant has not raised MTD ITSA with you by now, ask explicitly: who is owning my quarterly submissions, on what software, with what rhythm? If the answer is vague, that is a flag.
- Treating a spreadsheet plus bridging as compliant by default. It can be — but only if the digital link is preserved with no manual re-keying. The detail of why this approach is fragile is in our piece on why spreadsheets and free software will let you down under MTD ITSA.
- Forgetting that two income sources is two submissions. A sole trade plus a rental is two complete sets of digital records, two chart-of-accounts mappings, two submissions every quarter. The penalty regime treats each one separately.
- Leaving sign-up until July. The sign-up step requires HMRC to confirm and enrol you. Leaving it to the last fortnight is how owners discover, three days before the deadline, that something needs fixing they did not know existed.
If you would like a sense-check of where your setup actually stands, our MTD for Income Tax service page lays out exactly what a compliant setup looks like, and our UK management accounts work pairs the quarterly cadence with proper monthly numbers so the rhythm carries the business, not just the compliance.
FAQs
The 7 August 2026 deadline is not negotiable, but it is not impossible either. Eleven weeks is enough to migrate, clean up and rehearse — if the work starts now.
Get your MTD ITSA setup sense-checked before the deadline
Fifteen minutes is enough for me to tell you whether your current setup will hold on 7 August or quietly earn you a point on the day. Bring details of your income sources, your software (if any), and the state of your records.
Start with a free written assessment — Stuart will review your setup and reply with a clear written plan. No phone calls, no sales pressure, just a straight answer.