MTD for Income Tax Self Assessment: what sole traders and landlords need to know.

MTD for Income Tax Self Assessment replaces the annual SA100 with four quarterly digital updates per income source, an end-of-period statement and a final declaration. It applies from 6 April 2026 to sole traders and landlords whose combined gross business and property income exceeds £50,000, falling to £30,000 in April 2027.

What is MTD for Income Tax Self Assessment changing?

From 6 April 2026, sole traders and landlords with annual gross business or property income above £50,000 must comply with MTD for Income Tax Self Assessment (MTD for ITSA), under HMRC's Making Tax Digital for Income Tax guidance. The annual SA100 return is replaced by:

• Quarterly digital updates: summary of income and expenses for each tax period, submitted via MTD-compliant software within one month of the period end.
• An end-of-period statement (EOPS): annual statement per income source, including any accounting adjustments (capital allowances, accruals, etc.).
• A final declaration: by 31 January following the tax year, finalising overall tax liability with any additional income or reliefs.

For the 2026/27 tax year, quarterly update deadlines are:

Who is in scope, and from when?

The phased rollout:

• April 2026: Sole traders and landlords with combined business and property income above £50,000.
• April 2027: Threshold drops to £30,000.
• April 2028 (proposed): Threshold drops to £20,000.

The income test is on the prior tax year. A sole trader with 2024/25 gross business income of £55,000 is in scope from April 2026 even if their 2026/27 income drops below the threshold.

Partnerships, limited companies, employees on PAYE only, and individuals with only investment income are not affected at this stage. Those are different regimes.

What "digital records" actually means

MTD requires "digital records", but HMRC's definition has been clarified over the years. You need to:

• Record each transaction (income receipt, business expense) electronically.
• Use MTD-compliant software for the quarterly submission.
• Maintain digital links between the recording system and the submission tool, no manual rekeying of figures.

What you don't need:

• Real-time digital recording. You can still log transactions weekly or monthly.
• Sophisticated accounting software, a structured spreadsheet plus bridging software is acceptable for very small operations.
• Receipts in digital form, paper receipts are fine as long as the resulting transaction record is digital.

HMRC-recognised MTD ITSA software

HMRC's list of software for sending Income Tax updates is broad. The practical options for sole traders and landlords:

For landlords with multi-property portfolios, Hammock is genuinely strong, built specifically for buy-to-let and let-property reporting. For everyone else, Xero or FreeAgent are the safe choices, and we work in both.

What to do in 2025 (or now)

If you're in scope from April 2026, the practical steps now:

1. Get on MTD-compliant software: at least 6 months before the deadline. The transition shouldn't happen in March 2026 alongside everything else.
2. Set up the chart of accounts and bank feeds properly. Configure your business or property categories to match HMRC's ITSA structure (which broadly mirrors SA103 and SA105).
3. Start recording transactions weekly: even if not strictly required, the habit reduces the friction of the quarterly submissions.
4. Authorise an agent: if you use an accountant, they will need MTD agent authorisation to file on your behalf. This is a separate step from existing 64-8 authorisation, as HMRC's client authorisation guidance explains.
5. Run a dry-run quarter: use the software for a tax period before the deadline and check the output. Surface issues early.

What changes operationally

For sole traders

The biggest operational change is shifting from annual to quarterly thinking. Most sole traders previously dealt with Self-Assessment once a year, typically in January. From April 2026, four submissions a year, plus the EOPS and final declaration, means quarterly engagement with your books. For sole traders already on monthly bookkeeping software, this is incremental. For those still using spreadsheets at year-end, it's a real workflow change.

For landlords

Property income reporting (SA105 today) becomes quarterly. Each property is a separate "income source" requiring quarterly updates. For landlords with multi-property portfolios, software with per-property reporting becomes essential. Hammock and Xero handle this well; FreeAgent's property handling is more limited.

What stays the same

• The tax rates themselves, Income Tax thresholds and rates unchanged by MTD.
• The 31 January final tax payment deadline, still the same, per HMRC's Self Assessment deadlines.
• Self-Assessment is not abolished. It's replaced by quarterly updates plus EOPS plus final declaration. Same concept, different mechanics.
• Payment-on-account schedule, still 31 January and 31 July.

What are the penalties for a late quarterly update?

HMRC has implemented a points-based penalty system for late MTD submissions. Miss a deadline, get a point. Accumulate four points within a tax year (for ITSA, this is one penalty cycle) and a £200 penalty applies. Further late submissions in the penalty period attract further £200 penalties.

The system is more lenient than the old £100-immediately model: one or two late submissions in a year won't trigger a penalty, but persistent lateness does.

The clients who will struggle with MTD for ITSA are the ones who currently do their Self-Assessment in January using a shoebox of receipts. For everyone else, modern software handles the transition transparently.

The bottom line

MTD for Income Tax is real, finally, after years of delay. April 2026 for income above £50,000. Get on MTD-compliant software now. Authorise your accountant for MTD if applicable. Run a dry-run quarter in late 2025 or early 2026 to surface issues. The transition itself is administrative. The improvement in financial visibility, knowing quarterly where you stand rather than annually, is the underrated benefit.

What does MTD for Income Tax cost to comply with?

Less than most people expect in software, more than most people expect in habit. Worked example, illustrative rather than a real client. A sole trader consultant with £68,000 of gross fees and one buy-to-let flat has two separate income sources, so eight quarterly updates a year rather than four, plus two end-of-period statements and one final declaration.

That last row is the honest case for the regime. A sole trader who files in January 2028 for the year ended April 2027 is looking at a number they can no longer do anything about. Quarterly updates make the liability visible while there is still time to fund it.

How do two businesses and a rental work together?

Separately, and this is the detail that catches people. Each trade and the property business are distinct income sources, and each needs its own quarterly update. A landscaper who also runs a small online shop and lets one flat has three income sources, which means twelve quarterly submissions a year.

The threshold test, though, is combined. HMRC looks at total gross income from self-employment and property together against the £50,000 line for April 2026, dropping to £30,000 from April 2027. Someone with £28,000 of trading income and £24,000 of rent is in scope even though neither figure alone comes close. Gross means before expenses, which is the second thing people get wrong.

Landlords with portfolios should read this alongside landlord and property SPV accountants, and anyone weighing up incorporation instead should look at UK R&D tax credits and Corporation Tax and company incorporation, because moving to a limited company takes you out of ITSA and into a different regime entirely.

Who is exempt from MTD for Income Tax?

A narrow group, and exemption is granted on application rather than assumed. HMRC's published grounds cover people who cannot use digital tools because of age, disability, location or religious belief, plus those subject to insolvency proceedings. Being busy, being on paper, or disliking software are not grounds. The application route and the current position are set out in HMRC's Making Tax Digital for Income Tax guidance.

Partnerships are outside the first phases, as are limited companies, people with only employment income taxed through PAYE, and people whose only untaxed income is investment income. Trusts and estates are excluded at this stage too. That leaves sole traders and unincorporated landlords carrying the whole of the initial rollout.

How to get MTD-ready in one quarter

1. Pick software from HMRC's list of software for sending Income Tax updates and connect the business bank feed. Personal accounts stay out of it.
2. Set up the categories to mirror the SA103 and SA105 boxes now, so the quarterly output needs no translation later.
3. Sign up through the HMRC sign-up service, and give your accountant MTD agent authorisation. The older 64-8 authorisation does not carry over, and HMRC's client authorisation guidance explains the difference.
4. Run one dry quarter before it counts. Submit nothing, but produce the figures and compare them to what you would have reported. Every problem you will have shows up here.
5. Move the bookkeeping to a weekly ten minutes. The people who struggle with this regime are not the ones with complex affairs, they are the ones who still do a year of admin in one January sitting.

If you would rather hand it over, we file as your authorised agent through our UK Self-Assessment filing service, with the bookkeeping running in FreeAgent or Xero depending on scale, and the wider UK position covered on accountants for UK SMEs. Sole traders should also read sole trader accountants, and anyone still VAT-registered should pair this with our Making Tax Digital for VAT guide. Several years behind? Start with catch-up bookkeeping.