Making Tax Digital for Income Tax: HMRC Signed You Up
HMRC signed you up for Making Tax Digital for Income Tax after your catch-up return. What the letter means, what you now owe, and how to get out.
The letter that starts the clock
If HMRC has signed you up for Making Tax Digital for Income Tax without you ever asking to join, it is because your 2024-25 Self Assessment return showed qualifying income above £50,000. For clients who only filed that return recently, as part of a catch-up, the compliance exercise itself is what triggered the enrolment. You are in, backdated to 6 April 2026.
That connection is the part almost nobody has spelled out. From September 2026 HMRC began automatically signing up sole traders and landlords who met the threshold on their 2024-25 return but had not enrolled themselves. The population HMRC is sweeping up is, by definition, people who were not on its radar in time for the earlier voluntary invitations — and a large slice of that population is people whose 2024-25 return arrived late. If you spent this year bringing missed UK returns up to date, you did not just settle an old liability. You handed HMRC the exact data point that puts you into a quarterly reporting regime for the year you are already halfway through.
Why did the letter arrive precisely after I brought my filings up to date?
HMRC's mandation logic is mechanical. It reads the qualifying income figures on your 2024-25 return, compares them with the threshold, and if you are over it and have not signed up, it signs you up for you. The only variable is when it reads the return.
Taxpayers who filed 2024-25 on time, by 31 January 2026, were assessed in the first pass. They received the earlier "you will need to use Making Tax Digital from April 2026" letters, with months of warning before the regime began. Anyone whose 2024-25 return was not on file at that point was simply invisible to the check. There was nothing to measure.
Then you filed. A voluntary disclosure of missed UK returns, a late registration for Self Assessment after HMRC picked up your UK property income, a set of returns prepared alongside an IRS catch-up — whatever the route, a 2024-25 return landed on your record in the middle of 2026 showing gross rents or self-employment turnover above £50,000. HMRC's later sweep caught it, and the automatic sign-up followed.
The uncomfortable arithmetic is that the enrolment is retrospective while the discovery is not. Mandation runs from 6 April 2026 because that is what your 2024-25 figures dictate. It does not run from the date HMRC noticed. So the letter does not tell you what you must start doing next quarter; it tells you what you should already have been doing since April, in a tax year that is now more than four months old.
Clients read this as a penalty notice or an enquiry. It is neither. It is an administrative confirmation that your filing obligations for 2026-27 have changed shape. But it is also not optional, and it is not a proposal you can decline by ignoring it.
What is the qualifying income figure actually measured on?
Three details matter enormously for a catch-up client, and all three are routinely misread. We deal with them briefly here; the mechanics of threshold determination and the quarterly calendar are covered in depth across our cross-border guides library, and this piece deliberately does not repeat that ground.
It is the 2024-25 return, not the most recent one you filed
If you filed four years of missed returns in one go, the enrolment test looks only at 2024-25. A client who had a strong 2024-25 because a property was let for the full year, and a weak 2025-26 because it stood empty for six months, is still mandated. So is a client who sold the property in 2025 and no longer has the income at all. The threshold year is fixed by statute-driven timetable, not by your current circumstances, and a subsequent fall in income does not reverse the enrolment automatically.
It is gross, before a single expense
Qualifying income is turnover. It is rent received before letting agent fees, before mortgage interest, before repairs, insurance and service charges — and before the finance cost restriction that turns a paper profit into a real one. A London flat and a Manchester flat producing £54,000 of combined gross rent and a genuine taxable profit of £9,000 clears the threshold comfortably. Clients who mentally track their portfolio by net yield are the ones most surprised by the letter.
Foreign property counts if you are UK resident
This is the point that catches US-connected clients hardest. Where you are UK tax resident, gross rent from property outside the UK counts towards qualifying income alongside UK rent. The Brooklyn brownstone you kept when you moved, the Florida condo, the California rental you have owned since before you had ever heard of HMRC — if that income belongs on your SA106 foreign pages, its gross figure is in the calculation. HMRC's own guidance on working out qualifying income is explicit that foreign property income is included for UK residents.
Read that alongside the reason many of these clients were behind in the first place. The unreported US rental was frequently the thing that made the UK return complicated enough to be deferred year after year. Disclose it properly, and it is the same figure that pushes you over the mandation line. Two consequences of one omission, arriving in sequence.
What the letter says, and what it quietly does not
The letter (or the message in your HMRC online account, depending on your contact preferences) confirms that you have been signed up and directs you to guidance. HMRC's page, check what to do if HMRC has signed you up for Making Tax Digital for Income Tax, is the operative source. Read closely, it establishes several things a skim will miss.
- You are already mandated, not invited. There is no acceptance step. The obligation exists from the start of the current tax year.
- Quarterly updates that have already fallen due are overdue now. HMRC's instruction is to send the overdue update as soon as possible — not to begin at the next quarter as if nothing had happened.
- You still need MTD-compatible software. Being signed up by HMRC does not provide it, and the old route of typing figures into the Self Assessment portal at year end is closed to you for this income.
- Penalty points are not charged for missed quarterly updates in 2026-27. The first year of mandation carries a soft-landing on quarterly update penalties. That relief is narrow and specific.
- The soft landing does not extend to your return or your payments. Late filing and late payment penalties for the annual return are entirely unaffected, as is anything still outstanding on the earlier years you have just disclosed.
The last two points are where catch-up clients get hurt. Someone reads "no penalty points in year one", concludes the whole regime can wait, and takes their eye off the 31 January deadline that does carry teeth — while an older year's liability continues to accrue interest in the background.
The overdue quarterly updates: what you actually owe today
Once signed up mid-year, you owe every quarterly update whose deadline has already passed for each qualifying source. Two rental businesses and a consultancy is three separate reporting streams, not one.
The design of the regime does help here. Quarterly updates are cumulative: each one restates the year to date rather than reporting a discrete three-month slice. In practice that means a single well-prepared submission per source can bring you current, because the latest update supersedes what should have been filed earlier. It does not mean the earlier deadlines never existed, but it does mean the remediation is one exercise, not a forensic reconstruction of each quarter in isolation.
What it demands is digital records from 6 April 2026 onwards. If your bookkeeping for the current year exists as a bank statement folder and a mental note, that has to become a compliant digital record retrospectively, covering months you were not treating as reportable. For a client who has just been through a disclosure, this is the second data-gathering exercise in a year, and it is worth building the ledger once, properly, so that the same records feed both the quarterly updates and the US position.
How the two systems treat the same rental income
| Point | UK / HMRC under MTD | US / IRS |
|---|---|---|
| Reporting rhythm | Quarterly updates plus a year-end finalisation | Annual return only; no quarterly income reporting for individuals |
| Record-keeping form | Digital records in compatible software, digitally linked | No prescribed digital format; substantiation standard only |
| Threshold trigger | Gross qualifying income above £50,000 on the 2024-25 return | Filing thresholds by status; no turnover-based digital mandate |
| Foreign rental treatment | Foreign property counts towards the threshold if UK resident | Worldwide rental reported on Schedule E regardless of location |
| Depreciation on rentals | Not available; capital allowances restricted for residential lets | Mandatory depreciation, with recapture on disposal |
| Year end | 5 April | 31 December |
| Effect of being behind | Late returns feed the mandation check and can trigger enrolment | Late returns may be regularised through streamlined procedures |
The mismatch that causes the most rework is the last row but one. A US-connected landlord who has been depreciating a UK property on Form 1040 for years, correctly, now has to produce a UK digital ledger that never recognises that deduction, in software built for UK-only landlords. The answer is not two sets of books. It is one transaction-level record with two reporting overlays — an approach our US-UK tax accountants build as standard for dual-filing clients.
Can you get out of it if you were signed up wrongly?
Often, yes. Automatic enrolment is a data-driven process applied to a population HMRC knows imperfectly, and catch-up filers are exactly the cohort where the data is thinnest. There are four distinct routes out, and they are not interchangeable.
Route one: you were never over the threshold
Check the figure HMRC used against the return as filed. The recurring errors we see are a partnership profit share treated as self-employment turnover (it is not qualifying income), a jointly owned property returned at 100% when only your share counts, a one-off land transaction misread as a continuing source, and gross figures inflated by tenant deposits or recharged service costs that were never income. If the underlying return was itself wrong, the amendment and the mandation challenge are one conversation, not two.
Route two: an automatic deferral applies to you
This is the route most likely to succeed for a US-connected client, and the one most often missed. Certain entries on the 2024-25 return carry an automatic one-year deferral, so that mandation does not begin until at least April 2027. The residence and remittance basis pages — SA109 — are on that list, as are trust and estate income on SA107, averaging adjustments, and qualifying care income.
Consider how many cross-border catch-up clients file SA109 as a matter of course: anyone claiming split-year treatment on arrival or departure, anyone non-resident with UK rental income, anyone with a treaty residence position to disclose. If your 2024-25 return included those pages and you expect to file them again for 2026-27, you should have been deferred, and an automatic sign-up letter suggests the flag did not attach. That is a factual point to put to HMRC, not an argument to construct.
Route three: you fall into an excluded category
Some taxpayers are outside the regime without applying at all: partnerships as entities, trustees, personal representatives of a deceased person, non-resident companies, Lloyd's members in respect of underwriting, and individuals without a National Insurance number. That last category quietly captures a number of people we act for — a US citizen who has held UK property through a period of non-residence, or an accidental American who never worked in the UK, may genuinely have no NINO on record.
Route four: digital exclusion
An exemption is available where it is not reasonable for you to use compatible software, on grounds of age, disability, location without adequate internet access, or religious belief. HMRC sets out the criteria in its exemption guidance. Be realistic. Preferring paper, disliking software, having few transactions or objecting to the cost are all expressly rejected. For most high-net-worth clients this route is not available and should not be attempted; a weak exemption claim consumes weeks you do not have and leaves the overdue updates exactly where they were.
What to do while HMRC considers it
Do not treat a pending challenge as a suspension. Until HMRC confirms in writing that you are no longer required to use the service, the obligations stand. The sensible posture is parallel: open the challenge through Self Assessment general enquiries with the evidence attached, and simultaneously get the digital records in order so that if the challenge fails you are days from compliance rather than months. Keep the letter, the date you contacted HMRC, and any reference number — the year-one penalty relief covers quarterly updates, but a contemporaneous record of reasonable care is worth having in any later dispute.
Does any of this change your US position?
Directly, no. Making Tax Digital is a UK administrative regime. It does not alter what you report to the IRS, when you report it, or how much foreign tax credit you can claim. There is no US analogue and no quarterly US income filing to align it with.
Indirectly, it changes two things that matter.
First, timing discipline. A quarterly UK reporting cycle produces reliable, dated figures four times a year in a currency and a tax year that do not match your US return. Clients who let that data drift end up reconciling twelve months of GBP transactions in March against a 31 December year end. Clients who have the ledger set up correctly find the US return gets easier, not harder, because the underlying records finally exist in one place.
Second, evidential consistency. If you are regularising US filings through the streamlined filing compliance procedures, the rental figures in your non-wilfulness certification and your amended Schedule E should reconcile to the same source data now flowing into your UK quarterly updates. Divergence between the two, discovered later, is precisely the sort of inconsistency that undermines an otherwise clean submission. Sequencing the two exercises together is the whole point of our IRS streamlined filing work.
The first fortnight after the letter arrives
- Confirm the trigger. Pull the 2024-25 return as filed and identify the exact qualifying income figure. If it is wrong, that is your strongest ground and everything else waits.
- Check for a deferral flag. Did the 2024-25 return include SA109, SA107, averaging or qualifying care entries? If so, you may not be mandated until 2027 and the sign-up is challengeable on the face of the record.
- Count the qualifying sources. Each business and each property business reports separately. Establish how many streams you owe updates for before choosing software.
- Fix the record-keeping from 6 April 2026, not from today. The digital record has to cover the whole tax year, including the months before the letter.
- Bring the overdue updates current in one exercise. Cumulative reporting means the latest update carries the year to date. One accurate submission per source restores your position.
- Check nothing is still outstanding behind you. Enrolment attention has a habit of displacing the older liabilities, disclosures and payment arrangements that prompted the catch-up in the first place. Those are the ones carrying interest.
Where this sits in a wider cross-border position
Nobody comes to Jungle Tax because they are excited about quarterly bookkeeping. They come because a US and a UK obligation have been running in parallel, one or both has slipped, and the interaction has become difficult to see clearly. The automatic sign-up letter is a good illustration of why the interaction matters: a decision taken to fix the UK past has produced an unexpected UK future obligation, and the underlying figure that drove it was a US-situs asset reported on foreign pages.
Handled in isolation, each piece looks manageable and the sequence goes wrong. Handled together — the disclosure, the mandation position, the software, the US filings and the credit position across both — it becomes a single project with one set of numbers. That is how our UK tax services and US practice are built to work.
Speak to us before you respond to HMRC
If a sign-up letter has landed after a catch-up filing, the useful conversation is about whether you should be in the regime at all, and if you should, how to become current without disturbing the disclosure work you have just completed. We review the trigger return, test every exit route on the facts, and take the quarterly position current in one exercise. To discuss your position in confidence, contact our cross-border team for a private consultation.
