Making Tax Digital for Income Tax: The Complete Plain-English Guide (2026/27)

Updated 2026-06-11 · MTD Survival Kit team

If you're a sole trader or landlord, the way you report tax to HMRC has just had its biggest shake-up since Self Assessment launched in 1997. Making Tax Digital for Income Tax (often shortened to MTD ITSA) became mandatory in April 2026 for the first wave of around 864,000 people — and HMRC has been posting warning letters to make sure nobody misses it.

This guide explains the whole system in plain English: who's affected and when, what "digital records" actually means, the quarterly deadlines, the penalty system, and what to do about it this week. Every factual claim here comes from gov.uk guidance, current as of June 2026.

Who has to follow MTD, and from when

The trigger is your qualifying income: your gross income (before any expenses) from self-employment and property, added together.

Two details people miss. First, it's gross income — a landlord with £55,000 of rent and £30,000 of mortgage and repair costs is over the threshold, even though their profit is far smaller. Second, it's combined — £28,000 of freelance income plus £24,000 of rent put you over £50,000.

Employees on PAYE are unaffected. Limited companies are outside this regime (corporation tax has its own timetable). If you genuinely can't use digital tools — age, disability, location, religion — you can apply to HMRC for a digital exclusion exemption.

Not sure where you land? Our free 2-Minute MTD Checker gives you your exact start date and first deadline.

What actually changes

Three things, and only three:

1. Digital records. Every business income and expense item must be recorded digitally — in software or a spreadsheet — and kept up to date as you go. The shoebox of receipts and the January reconstruction are no longer legal record-keeping.

2. Quarterly updates. Four times a year, your software sends HMRC the running totals of your records, sorted into HMRC's official categories. No accounting adjustments, no tax calculations — just totals. If you have both a trade and property income, you send two updates per quarter, one for each.

3. Software submission. Updates go through MTD-compatible software, or a "bridging tool" that connects your spreadsheet to HMRC. You cannot type quarterly updates into the HMRC website.

Just as important is what doesn't change: how much tax you pay, and when. Payment deadlines (31 January, plus payments on account) stay exactly as they were. The final tax return survives too. HMRC never sees your individual transactions — only category totals.

The quarterly deadlines

The deadlines are identical every year:

Notice the periods: each update is cumulative, covering the tax year so far. This is good news — if you made a mistake in Q1, you just fix the record and the Q2 update automatically carries the correction. Nothing to resubmit.

If your accounting period runs 1 April to 31 March rather than the tax year, you can elect calendar update periods in your software (same deadlines, periods ending on month-ends). Choose before your first update of the year.

A quarter with no income and no expenses still requires an update. It takes minutes, but it's not optional.

Penalties: the points system

Each late quarterly update earns one penalty point. At four points, HMRC issues a £200 fine — and another £200 for every further late submission while you stay at the threshold. Points expire after 24 months, or reset after a sustained period of meeting every deadline.

The 2026 joiners get one concession: no penalty points for late quarterly updates during the first 12 months. The grace does not extend to the tax return itself — file that late and the usual penalties apply. And the updates still have to be sent eventually; you can't reach your tax return without them.

Late payment of tax is a separate, harsher regime — interest from day one plus escalating percentage penalties. The silver lining of quarterly updates: after each one, your software shows an estimated tax bill, so January is never a surprise again.

What "digital records" really requires

For each income or expense item you need the date, the amount, and the HMRC category it belongs to — recorded digitally, promptly, and preserved. For self-employment there are 2 income categories and 13 expense categories (turnover, cost of goods, travel, office costs, professional fees and so on); property income has its own set. The official lists live in HMRC's quarterly update direction.

A spreadsheet is fine — explicitly so — provided it connects to HMRC through a bridging tool with a digital link (no retyping totals by hand). Bridging tools are cheap (£0–£30/year): AbraTax and Clear Books have free tiers; VitalTax and 123 Sheets are around £30/year.

What stops being acceptable: paper ledgers, receipts in a drawer, and once-a-year data entry.

Your options, honestly compared

Do nothing until January. No longer survivable. Records must be kept as you go and the first deadline lands 7 August.

Hire an accountant. Hands-off, typically £500–£1,500/year for this kind of work. Sensible if your affairs are complex.

Full accounting software. £10–30/month subscriptions. Powerful, but most sole traders use a fraction of it and still struggle with what-goes-where.

Spreadsheet + bridging tool + a system. The cheapest compliant route, and for straightforward businesses the simplest. The catch: your spreadsheet must map to HMRC's exact categories and handle the cumulative quarters — which is precisely what the MTD Survival Kit (£19) gives you, with a plain-English guide and a 1-hour-per-quarter routine.

Do these three things this week

1. Find your start date — free 2-Minute MTD Checker, or work it out from the table above.
2. Put all four deadlines in your calendar — 7 August, 7 November, 7 February, 7 May. Recurring, every year.
3. Set up compliant records now, not the week before the deadline. Quarter one of clean records makes everything after it routine.

Educational content, not tax advice. Sources: gov.uk "Use Making Tax Digital for Income Tax" manual; HMRC quarterly update direction (27 March 2026); The Income Tax (Digital Obligations) Regulations 2026. If your situation is complex, speak to a qualified accountant.