Making Tax Digital (MTD) for Income Tax: The 2026 Transition Roadmap

Making Tax Digital for Income Tax Self Assessment (MTD ITSA) is the single largest change to UK personal tax compliance in a generation. From 6 April 2026, every UK-resident sole trader and landlord with combined property and self-employment income above £50,000 must keep digital records, submit four quarterly updates, and replace the annual Self-Assessment return with a Final Declaration. The threshold drops to £30,000 from April 2027 and is expected to fall to £20,000 from April 2028.

For most affected filers the transition is manageable: pick MTD-compatible software, migrate the bookkeeping, agree the quarterly review rhythm with an accountant. The traps are concentrated in five areas: how qualifying income is measured, the quarterly mechanics, software selection (native vs bridging), the Basis Period Reform interaction in the first MTD year, and the digital-exclusion exemption process for those who genuinely cannot file digitally.

Who is in scope from 6 April 2026

• UK-resident sole traders, landlords or self-employed individuals.
• Combined gross qualifying income from self-employment and property in 2024-25 above £50,000.
• Currently filing Self-Assessment.
• Not specifically excluded (most trustees, certain non-resident landlords, recipients of digital-exclusion exemption).

Qualifying income: gross, not profit

Qualifying income for MTD threshold testing is the sum of:

1. 1Gross UK rental receipts (before any expenses).
2. 2Gross overseas rental receipts reportable on UK Self-Assessment.
3. 3Gross self-employment turnover (all sources combined).
4. 4Furnished Holiday Let receipts (now treated as standard rental income post-April-2025 abolition).

Excluded from qualifying income: PAYE employment, pensions, dividends (including from your own SPV), interest and savings income, capital gains.

Quarterly updates and the Final Declaration

MTD ITSA replaces the single annual return with five filings per tax year:

1. 1Q1 update: 6 April to 5 July, due 7 August.
2. 2Q2 update: 6 July to 5 October, due 7 November.
3. 3Q3 update: 6 October to 5 January, due 7 February.
4. 4Q4 update: 6 January to 5 April, due 7 May.
5. 5Final Declaration: replaces SA, due 31 January following the tax year.

Each quarterly update is a cumulative year-to-date summary by category (income source, expense category). HMRC uses the data to provide an in-year tax estimate; the binding liability is confirmed via the Final Declaration. Tax payment dates are unchanged: 31 January and 31 July payments on account, plus 31 January balancing.

Recognised software: Xero, QuickBooks, or specialist apps

HMRC publishes a recognised vendor list. The realistic options:

MTD for joint property owners

Jointly owned property is one of the most misunderstood corners of MTD ITSA:

• Each owner tests the £50,000 threshold individually against their share of qualifying income.
• Married couples and civil partnerships: default 50/50 income split unless Form 17 declares unequal beneficial ownership.
• Each spouse files their own MTD quarterly updates if individually above £50,000.
• A couple can find one spouse inside MTD and the other outside in the same tax year.
• Form 17 declarations to shift income onto the lower-earning spouse can keep one partner below £50,000 for an additional year.

Applying for digital exclusion exemption

A small population of filers can apply for exemption from MTD ITSA on the grounds of digital exclusion. The criteria are tight:

• Age, disability or remoteness that makes digital filing impractical.
• Genuine objection on religious grounds (small minority).
• Bankruptcy or formal insolvency proceedings during the relevant year.

Mere preference for paper filing or unfamiliarity with software is not grounds for exemption. Applications go via HMRC and a written decision follows. Until exemption is granted, the filer remains within MTD and must file quarterly updates.

Basis Period Reform impact on the first MTD filing

The 2023-24 Basis Period Reform shifted unincorporated businesses from accounting-period basis to tax-year basis. The implications for the first MTD year (2026-27):

• Businesses with 31 March or 5 April year-ends are unaffected.
• Businesses with non-31-March year-ends had to recognise transitional profit in 2023-24, optionally spread over 5 years.
• The first MTD year starts on a tax-year basis (6 April 2026 to 5 April 2027) regardless of underlying accounting period.
• Where transitional profit spreading is in progress, the spread continues to flow through until exhausted.