From 6 April 2026, HMRC requires self-employed individuals and landlords with qualifying income above £50,000 to stop filing one annual Self Assessment return and start using Making Tax Digital for Income Tax (MTD ITSA) instead — keeping digital records and sending HMRC a quarterly update every three months. This is the biggest change to how sole traders and landlords report income since Self Assessment itself was introduced, and it is arriving now: the first mandatory quarterly updates for those caught by the £50,000 threshold begin in the 2026/27 tax year, based on income already earned in 2024/25.
For high-net-worth Americans and UK nationals alike who run a UK sole trade, consultancy, or a UK rental property portfolio, this guide sets out exactly who is caught from April 2026, what qualifying income means, how the phased rollout to lower thresholds will work over the next two years, and what to do before the deadline arrives.
What is Making Tax Digital for Income Tax?
Making Tax Digital for Income Tax (often shortened to MTD ITSA, for Income Tax Self Assessment) replaces the single annual Self Assessment return — for the specific income sources it covers — with a running, digital record-keeping obligation. Instead of gathering everything up once a year, affected taxpayers keep digital records of self-employment and property income and expenses throughout the year, using MTD-compatible software, and submit a summary to HMRC every quarter. The process ends with a Final Declaration after the tax year closes, which brings everything together (including any other income not covered by MTD, such as dividends or capital gains) into the equivalent of today's Self Assessment return.
Who must join from 6 April 2026
You must use Making Tax Digital for Income Tax from 6 April 2026 if your qualifying income was over £50,000 for the 2024/25 tax year, and you are a sole trader or landlord registered for Self Assessment. HMRC bases the decision on the tax year two years before the April in which you must start, so your 2024/25 income determines your 2026/27 obligation. If HMRC's records show you cross the threshold, they write to confirm you must join from 6 April 2026 — but the legal obligation applies regardless of whether or when that letter arrives, so it is worth checking your own position rather than waiting to be told.
What counts as qualifying income
Qualifying income is your gross self-employment income plus your gross UK property income, added together, before deducting any expenses or allowances. It is a turnover test, not a profit test — a landlord with £55,000 of gross rent and heavy mortgage and maintenance costs leaving only £15,000 of actual profit is still caught, because the £50,000 threshold looks at income before expenses. The same applies to a sole trader: gross fees and sales count, not net profit after costs. This catches a meaningful number of self-employed professionals and landlords with modest actual profit but substantial turnover, so it is worth checking gross figures specifically, not just what ends up on your tax bill.
The phased rollout: 2026, 2027, 2028
- From 6 April 2026: mandatory if qualifying income was over £50,000 in 2024/25.
- From 6 April 2027: mandatory if qualifying income was over £30,000 in 2025/26.
- From 6 April 2028: mandatory if qualifying income was £20,000 or more in 2026/27.
- Below £20,000: not yet mandated, though HMRC has signalled it intends to widen MTD further over time and voluntary sign-up is available now.
Quarterly updates: what actually gets submitted
Instead of one submission a year, MTD ITSA requires a quarterly update of income and expenses for each self-employment and property business you run, submitted digitally through MTD-compatible software. These updates are largely a running total of transactions, not a fully finalised tax calculation — the real adjustments (reliefs, allowances, apportionments) are made at the Final Declaration stage after the tax year ends. In practice this means most of the discipline shifts from a once-a-year scramble to ongoing digital bookkeeping throughout the year, which is exactly the point: HMRC wants near-real-time visibility of income rather than a single retrospective return filed up to ten months after the tax year closes.
The Final Declaration
After the tax year ends and the four quarterly updates are in, you submit a Final Declaration that finalises your tax position for the year — bringing in any income not covered by MTD (such as dividends, savings interest, capital gains, or foreign income) and applying reliefs and allowances, much as the current Self Assessment return does today. The Final Declaration deadline mirrors the current Self Assessment deadline structure, so the annual cut-off does not disappear entirely — what changes is that four interim submissions now sit ahead of it throughout the year.
MTD-compatible software is not optional
Quarterly updates must be submitted using software that is compatible with HMRC's Making Tax Digital system — a spreadsheet alone will not satisfy the requirement unless it is linked to bridging software that can transmit the data in the correct format. Most cloud accounting packages used by UK sole traders and landlords (Xero, QuickBooks, FreeAgent, and several dedicated MTD apps) already support this, but anyone still working from a paper diary or a standalone spreadsheet needs to move onto a compliant system well before their first quarterly deadline, not in the week it falls due.
Penalties for missing a deadline
MTD ITSA brings in a points-based late submission penalty regime rather than an automatic fine for every missed deadline. Each missed quarterly update or Final Declaration deadline adds one penalty point; once you reach the four-point threshold, a £200 fixed penalty applies, and every further missed deadline after that also triggers a £200 penalty. Points expire after two years of good compliance, but do not expire at all once you are sitting at the threshold — you have to demonstrate a run of on-time submissions to reset. Helpfully, HMRC has confirmed there are no penalties for missing a quarterly update deadline specifically in the 2026/27 tax year (a grace period for the first year of mandation), though the underlying obligation to keep digital records and submit still applies, and the Final Declaration deadline is not covered by that grace period.
What this means specifically for landlords
Landlords with UK rental property are squarely in scope if gross rental income (added to any self-employment income) exceeds the relevant threshold, and each rental property business is generally treated as one MTD business requiring its own quarterly cycle. This affects UK-resident and non-resident landlords alike, including US citizens who own UK rental property while also filing a US return on the same rental income — the two obligations run in parallel and on different calendars, so it is worth mapping HMRC's quarterly deadlines against your existing US filing calendar rather than treating them as unrelated. A landlord weighing whether Section 24 finance-cost restrictions make personal ownership still worthwhile can check the numbers with our UK Landlord Tax Calculator before MTD adds a new layer of process on top.
What this means for the self-employed
Sole traders — including consultants, contractors, and freelance professionals common among TaxStone's HNW client base — face the same quarterly cycle for their trading income. If you also file Self Assessment today, MTD does not remove your underlying tax liability or National Insurance obligations; it changes the mechanics and cadence of reporting. Anyone running a business through a UK limited company rather than as a sole trader is not directly affected by MTD for Income Tax (that income is dividends and salary, reported differently), which is itself a factor some self-employed professionals are now weighing when they revisit their trading structure.
The cross-border angle for Americans in the UK
MTD for Income Tax is a UK-only administrative requirement — it does not change your US filing obligations, and there is no equivalent US quarterly digital-records regime for a UK sole trade or rental business. But the shift to genuinely contemporaneous UK record-keeping is useful for cross-border filers regardless: better UK books make it easier to compute the Foreign Tax Credit accurately on your US return, and to stay on top of any US quarterly estimated tax obligations that run alongside it — see our US Quarterly Estimated Tax Calculator for how that separate US-side calendar works. If you are self-employed in the UK and also a US taxpayer, this is a natural point to review self-employment tax and UK/US totalization together with your new MTD software setup.
Steps to prepare before April 2026
- Check your 2024/25 gross self-employment and property income against the £50,000 threshold now, rather than waiting for an HMRC letter.
- Choose and set up MTD-compatible software with enough lead time to run at least one practice quarter before your first real deadline.
- Separate personal and business banking if you have not already — it makes quarterly digital record-keeping far faster.
- Agree with your accountant who will submit each quarterly update and the Final Declaration, and build the four extra deadlines into your calendar alongside existing UK and, if relevant, US filing dates.
- If you are close to the threshold, consider whether restructuring (for example incorporating a rental portfolio) changes your MTD position — but weigh that decision on its own tax merits, not MTD administration alone.
Common misconceptions
- "It's based on my profit" — it is not; the £50,000 (and future £30,000/£20,000) thresholds are based on gross qualifying income before expenses.
- "I'll get a letter, so I don't need to check myself" — the legal obligation applies regardless of whether HMRC's letter has reached you yet.
- "Quarterly updates are like four mini tax returns" — they are largely running totals of income and expenses; the detailed reliefs and adjustments happen at the Final Declaration.
- "MTD replaces my US filing obligations too" — it does not; MTD is purely a UK Self Assessment mechanism and has no bearing on IRS reporting for US citizens.
- "There's no penalty risk in the first year" — there is no quarterly-update penalty specifically for 2026/27, but the Final Declaration deadline is not covered by that grace period, and the obligation to keep digital records still applies from day one.
Get ready before the deadline hits
The £50,000 threshold catches a meaningful slice of TaxStone's client base — self-employed professionals and landlords with substantial gross income even where actual profit is more modest. Getting MTD-compatible software and a quarterly rhythm in place now, well before 6 April 2026, avoids a scramble in the first live quarter and keeps your UK records clean for the US side of your filing too. A US/UK tax specialist can check whether you are caught by the April 2026 threshold, help choose compliant software, and make sure your quarterly UK cycle and your US filing calendar work together rather than against each other.
