Making Tax Digital for Income Tax explained

Quick answer: Making Tax Digital for Income Tax (MTD for Income Tax, sometimes called MTD ITSA) is HMRC's new way of running Self Assessment for sole traders and landlords. Instead of one tax return a year, you keep digital records and send four quarterly updates plus a final declaration through compatible software. It rolls out in waves by income: over £50,000 from April 2026, over £30,000 from April 2027, over £20,000 from April 2028. Not sure if it catches you? Run the MTD scope checker.

Making Tax Digital for Income Tax is the biggest change to personal tax admin in a generation, and it lands on sole traders and landlords first. This guide explains it in plain English — what it is, why HMRC is doing it, who has to comply and when, and exactly how the new quarterly rhythm differs from the Self Assessment you file today. It's a topical anchor: use it as your starting point and follow the links to the tools and deeper guides.

Ledgers is software and general guidance, not personalised tax advice. Where a figure matters, we state the tax year and link to GOV.UK so you can check it against your own situation.

What Making Tax Digital for Income Tax actually is

MTD for Income Tax replaces the annual Self Assessment tax return with a digital, quarterly way of reporting your self-employment and property income to HMRC. There are three moving parts:

1. Digital records — you keep a digital record of each business's income and expenses (spreadsheets alone don't cut it unless bridged; you need compatible software).
2. Quarterly updates — four times a year your software sends HMRC a running, year-to-date summary of income and expenses for each business.
3. Final declaration — once a year you finalise the figures, add anything else (dividends, savings interest, reliefs), confirm it's correct, and pay. This replaces the Self Assessment return itself.

It is not a new tax and it does not change how much you owe — it changes how and how often you report. See HMRC's overview at Use Making Tax Digital for Income Tax.

Why HMRC is doing this

HMRC's stated aims are to reduce errors, close the "tax gap", and modernise a paper-era system. Keeping records digitally and reporting through the year is meant to make mistakes less likely and give you a clearer running picture of what you'll owe, rather than a nasty surprise the following January. You can read HMRC's rationale in Modernising the tax system through Making Tax Digital. Whether you find the reasoning convincing or not, the obligation is legislated and coming — so the practical question is when it catches you.

Who has to use it, and when

MTD for Income Tax applies to sole traders and landlords — people with self-employment income, property (rental) income, or both. It is being phased in by qualifying income, using strict "over" thresholds (exactly at the threshold is not caught):

Qualifying income is the key concept and it trips people up. It's your gross self-employment turnover plus your gross property income (rents before deducting any expenses), added together. It does not include employment (PAYE) salary, dividends, savings interest, pensions or partnership income. HMRC identifies you from your prior-year Self Assessment return, so the £30,000 April-2027 cohort is picked up from the 2025/26 return filed by 31 January 2027 — which is why those earners should be preparing during 2026.

HMRC will write to people it believes are in scope, but the responsibility to check is yours. For the official rules see Find out if and when you need to use Making Tax Digital for Income Tax and the reduction to £20,000 confirmed in this policy paper.

The fastest way to get a personal answer is the MTD scope checker — it applies the gross-income rule and the strict thresholds for you. For a deeper walkthrough, see our guide on whether the MTD threshold is gross income or profit.

A quick worked example

Priya is a freelance designer with £38,000 of self-employment turnover and a flat she rents out for £9,000 a year (before letting agent fees). Her qualifying income is £47,000 — turnover plus gross rent, expenses ignored. That's under £50,000, so she's not in the April-2026 wave. But it's over £30,000, so once that figure shows on a 2025/26 return she'll be mandated from 6 April 2027. If her income creeps up, the scope checker will flag the earlier date.

Digital records: what you have to keep

From your start date you must keep a digital record of each business's transactions — the date, amount and category of income and expenses — in compatible software (or in a spreadsheet linked by "bridging" software). You can't wait until year-end and type totals in once. This is the single biggest behaviour change for people who currently keep a shoebox of receipts.

Landlords get one easement worth knowing: all your UK rental properties together count as one UK property business, so you report the property business as a whole, not property by property. Foreign property is a separate source. Jointly-owned property also has a lighter-touch record-keeping easement. Our MTD for landlords guide covers the property specifics.

Quarterly updates: the new rhythm

Four times a year, your software sends HMRC a cumulative, year-to-date summary for each business. They're summaries, not mini tax returns — no reliefs or allowances are calculated at this stage. Using the standard tax-year quarters, the deadlines are:

Because updates are cumulative, a later one supersedes and corrects the earlier ones — so a small error in Q1 gets cleaned up naturally by Q2. See Send quarterly updates for HMRC's detail. To see your own dates, use the MTD deadline calculator.

Final declaration: replacing the tax return

After the tax year ends you complete a final declaration — the step that actually replaces your Self Assessment return. Here you bring in everything the quarterly updates left out: other income (employment, dividends, savings interest), allowances, reliefs and any accounting adjustments. You confirm the whole picture is correct and pay what's due. The final declaration deadline is 31 January after the end of the tax year — the same date Self Assessment uses today, and your tax payment dates are unchanged too.

So the year looks like five submissions (four quarterly updates + one final declaration) instead of the single return you file now.

How this differs from Self Assessment today

The headline: the tax and the payment calendar don't change, but you now report through the year in software instead of once in a spreadsheet or on paper.

Penalties under MTD for Income Tax

MTD introduces a new points-based late-submission system. You get one penalty point for each quarterly update or final declaration you file late. Reach the point threshold (4 points for quarterly filers) and a £200 penalty applies — after that, each further late submission triggers another £200. A single slip won't cost you money; repeated lateness will.

Late payment penalties are separate and not points-based: nothing if you pay within 15 days of the due date; then charges begin (for 2026/27, 3% of the tax still outstanding at day 15, a further 3% at day 30, then an annual rate of 10% charged daily from day 31). Interest also runs on late tax.

One relief for the first wave: 2026/27 is a soft-landing year for the £50k cohort — no late-submission penalty points on the quarterly updates that year (the final declaration and all late-payment penalties and interest still apply). See Penalties for Making Tax Digital for Income Tax. Our MTD penalty calculator helps you estimate exposure.

What to do now

• Check your date. Run the MTD scope checker — it's a two-minute answer.
• Map your deadlines with the MTD deadline calculator so the quarterly dates are in your calendar.
• Estimate your tax with the self-employed tax calculator so the numbers aren't a surprise.
• Start keeping records digitally now, even before you're mandated — habits take time, and volunteering early is allowed.

Ledgers is built for this: it owns your general ledger, categorises transactions as they land, and prepares the quarterly updates and final declaration — with every figure open for you to check. That's the point of digital records: a running, correct picture rather than a January scramble.

Frequently asked questions

Is Making Tax Digital for Income Tax a new tax?

No. It doesn't change how much tax you pay or when you pay it — the 31 January and 31 July payment dates are unchanged. It only changes how you keep records and how often you report, moving from one annual return to four quarterly updates plus a final declaration.

Do I still file a Self Assessment tax return under MTD?

No — the annual final declaration replaces the Self Assessment return once you're mandated. You still finalise all your income and reliefs and confirm the figures by 31 January, but you do it through compatible software rather than the SA return form.

How is my income measured for the thresholds?

By qualifying income: gross self-employment turnover plus gross property rents (before expenses), from self-employment and property only. Salary, dividends, savings interest and pensions are excluded. HMRC reads it from your prior-year Self Assessment return, and the thresholds are strict "over" figures. The MTD scope checker applies this for you.

What happens if I miss a quarterly update?

You get one penalty point. A £200 penalty only applies once you reach the point threshold (4 points for quarterly filers), so a one-off late submission won't cost money — repeated lateness will. Late payment is penalised separately and starts after 15 days. See the MTD penalty calculator.

I'm a landlord — do I report each property separately?

No. All your UK rental properties together are treated as one UK property business for MTD, so you report the business as a whole rather than property by property. Foreign property is a separate source. See our MTD for landlords guide for the detail.