Making Tax Digital for Income Tax Explained: Thresholds, Deadlines & How to Prepare

Making Tax Digital for Income Tax Self Assessment (MTD ITSA) is the biggest change to how sole traders and landlords report income to HMRC since Self Assessment itself was introduced. The first wave of taxpayers has already been mandated in as of April 2026, and two more thresholds are on the way. This guide explains exactly who's affected, when, what quarterly reporting actually involves, and how to get ready without last-minute panic.

What Is MTD for Income Tax?

Making Tax Digital for Income Tax is HMRC's replacement for the traditional, once-a-year Self Assessment return — at least for a growing group of sole traders and landlords. Instead of gathering twelve months of records and submitting everything in one go by 31 January, people brought into MTD ITSA must keep digital records throughout the year and send HMRC a summary of income and expenses every three months, through software that's compatible with HMRC's systems.

It's a separate scheme from Making Tax Digital for VAT, which has applied to VAT-registered businesses for several years already. MTD ITSA has its own thresholds, its own software requirements, and its own phased rollout — and if you're both VAT-registered and within scope of MTD ITSA, you'll eventually be dealing with both regimes side by side, each with their own submission calendar.

The stated goal, from HMRC's side, is to reduce the scale of errors that show up in tax returns by encouraging real-time, digital record-keeping rather than a once-a-year reconstruction of the year's finances from receipts and spreadsheets. Whether that plays out in practice or simply adds four extra filing deadlines a year is something accountants and small business groups are still debating — but either way, it's now mandatory for a widening slice of taxpayers, not optional.

Thresholds & Mandation Dates

MTD ITSA is being phased in by income threshold rather than applying to everyone at once. The threshold is based on your total gross income — turnover before expenses — from self-employment and property combined, not your profit. A landlord with £45,000 in rent and heavy mortgage interest costs that leave almost no taxable profit is still assessed on the £45,000 figure, not the profit left over.

Each threshold is cumulative — the £30,000 group joins in 2027 alongside everyone already mandated in at £50,000, and the same happens again when the £20,000 threshold takes effect. HMRC determines whether you're over a threshold by looking at the qualifying income reported on your most recent Self Assessment return before each mandation date, and writes to you directly if you're expected to join. It's still worth checking yourself rather than waiting for a letter, particularly if your income is close to a threshold and could tip you in either direction from one year to the next.

Interactive: Am I Affected, and From When?

Enter your combined gross self-employment turnover and gross property income below to see which threshold applies to you and roughly when you'd be expected to join, based on the confirmed and expected mandation dates above.

What a Quarterly Update Involves

Once you're within scope, the annual return is replaced by five separate submissions each year instead of one. Four are quarterly updates, and the fifth is a final declaration:

• Quarterly updates — a running total of income and expenses for each three-month period, sent through MTD-compatible software. These are cumulative summaries, not detailed transaction-by-transaction filings, but the underlying records still need to be kept digitally.
• Standard quarters run 6 April–5 July, 6 July–5 October, 6 October–5 January, and 6 January–5 April, each due one calendar month later — by 7 August, 7 November, 7 February and 7 May respectively. Some software allows calendar-quarter reporting instead, aligned to standard month-end dates.
• Final declaration — submitted after the tax year ends, confirming the total figures, applying any reliefs or adjustments, and declaring other income sources (employment, dividends, savings interest) that don't go through quarterly updates. This is still due by the familiar 31 January deadline.

In practice, this means bookkeeping shifts from an annual scramble to something closer to quarterly VAT-style reporting, even though MTD ITSA and MTD for VAT remain legally separate systems with different software compatibility requirements.

Penalties & the 2026/27 Soft Landing

Late submission penalties under MTD use a points-based system rather than an automatic fine for every missed deadline. Each late quarterly update earns a penalty point, and once you accumulate four points, a flat £200 penalty is charged; further missed deadlines at that stage trigger further £200 penalties without needing to build up points again.

HMRC has confirmed a soft-landing concession for the first cohort of taxpayers mandated in from April 2026: no penalty points will be awarded for late quarterly updates during the 2026/27 tax year. That doesn't make quarterly updates optional — you still need to submit all four before you can complete your final declaration — but it does mean the points-based penalty won't start accumulating for this first group until later. Taxpayers who join from April 2027 or April 2028 do not get the same grace period; the soft landing applies specifically to the first cohort's first year.

Late payment penalties are a separate matter and continue to apply on their usual schedule, calculated on tax actually owed rather than on the quarterly updates themselves.

Software & Record-Keeping Requirements

MTD ITSA requires digital record-keeping and submission through HMRC-recognised software — spreadsheets alone aren't compliant unless paired with bridging software that can transmit the required data in the correct format. In practice, most people either use a dedicated MTD-compatible accounting package (built for self-employment and property income specifically) or a spreadsheet combined with bridging software that plugs the gap.

Whichever route you take, records need to be kept digitally as transactions happen, rather than reconstructed from paper receipts at the end of the quarter. That's a bigger behavioural shift than the quarterly deadlines themselves for anyone still running their books from a shoebox of receipts and a once-a-year spreadsheet exercise.

How to Prepare

1. Check your qualifying income against the thresholds above using your most recent Self Assessment figures, not just a rough guess.
2. Confirm whether HMRC has already written to you about mandation — if you're near a threshold, don't assume you're exempt just because you haven't heard anything yet.
3. Choose MTD-compatible software well before your first deadline, rather than during the week your first quarterly update is due.
4. Start digital record-keeping now, even if your mandation date is a year or two away — it's far easier to build the habit gradually than to switch systems abruptly.
5. Separate business and personal transactions if you haven't already, since quarterly reporting makes mixed accounts considerably more time-consuming to untangle four times a year instead of once.

Exemptions & Special Cases

A small number of taxpayers are exempt from MTD ITSA regardless of income — including those without a National Insurance number, and cases where HMRC accepts that digital record-keeping isn't reasonably practicable, for example due to age, disability, location, or religious grounds. These exemptions require an application to HMRC rather than being automatic, and simply finding digital tools inconvenient is not, on its own, grounds for exemption.

Trustees, personal representatives of deceased estates, and certain types of partnership income are currently outside the initial phases of MTD ITSA, though HMRC has signalled it may extend the rules to some partnerships in future phases alongside the £20,000 threshold.

Frequently Asked Questions