How HMRC tests the threshold
Making Tax Digital for Income Tax Self Assessment (MTD ITSA) applies from 6 April 2026 to any UK landlord, sole trader, or self-employed individual whose combined gross qualifying income from property and self-employment in the 2024-25 tax year exceeded £50,000. HMRC tests the threshold against the most recent Self-Assessment return on file, not against expectations of 2025-26 or 2026-27 income. A landlord whose 2024-25 income exceeded £50,000 is inside MTD from April 2026 regardless of whether 2025-26 income falls below the line.
Gross qualifying income is rents received plus any self-employment turnover, measured before expenses. A landlord with £52,000 of rents and £8,000 of allowable expenses (giving £44,000 of taxable profit) is inside MTD because gross is above £50,000. This is the most frequently misunderstood part of the threshold test and the single biggest reason landlords currently believe they are outside MTD when they are not.
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What counts as qualifying income
- Rents from UK residential property (long lets and short lets).
- Rents from UK commercial property held personally.
- Furnished Holiday Let income (treated as property income from April 2025 following the FHL repeal).
- Sole trader self-employment turnover, combined with property income for the threshold test.
- Foreign property rental income returnable on the UK Self-Assessment.
- Excluded: dividend income, employment PAYE income, savings interest, partnership profit shares (partnerships have a separate MTD timetable).
Joint ownership and the £50k test
Where a property is jointly owned by spouses or civil partners, each owner's share of gross rental income counts toward their own £50k test, not the joint total. A married couple jointly owning properties producing £80,000 of rents are split 50:50 (£40,000 each) by default, and both are outside MTD. A landlord who declared a 99:1 income split via Form 17 sees the 99% partner inside MTD and the 1% partner outside. See [the joint-ownership spoke](/blog/mtd-joint-ownership-spouses/) for the detailed treatment.
The HMRC notification letter
HMRC writes individually to every taxpayer expected to be inside MTD ITSA from April 2026, based on their 2024-25 Self-Assessment data. The letter typically arrives between October 2025 and February 2026, confirms the entry date, and provides initial software guidance. Receiving this letter is the strongest single signal that MTD applies. Not receiving the letter does not guarantee exemption, particularly where Self-Assessment was filed late or amended after HMRC's threshold sweep.
Threshold reductions in later tax years
| Tax year | Threshold | Effect on UK landlords |
|---|---|---|
| April 2026 | £50,000 | Largest landlord cohort enters MTD |
| April 2027 | £30,000 | Mid-portfolio landlords brought in |
| April 2028 (expected) | £20,000 | Single-property landlords with London-area rents brought in |
| Future | Under review | Further reductions consulted on but not legislated |
The £30k threshold from April 2027 brings most of the remaining Harrow-area landlord cohort into scope. A typical North-West-London two-bed flat at £1,500/month produces £18,000 of rent; a three-bed semi at £2,400/month produces £28,800. Landlords with two or more properties in the Harrow area are almost certainly inside MTD from April 2027 even if outside in April 2026.
What "immediate action" actually means
Landlords inside MTD from April 2026 need to be on MTD-compatible software with linked bank feeds and proper digital record-keeping by 5 April 2026, ready to submit the first quarterly update by 7 August 2026. Working backward, the practical steps that need to be done in the next 90 days are software selection, bank account separation, opening balance reconciliation against the 2025-26 closing position, and a dry run of the quarterly submission mechanics.
Do I need to register for MTD ITSA, or does HMRC do it automatically?
HMRC enrolment is automatic for taxpayers identified from Self-Assessment data, but software registration through the HMRC API is a separate step the taxpayer or their agent must complete. The agent authorisation under MTD is a new code (not the existing 64-8) and must be set up before quarterly submission. An [MTD-ready accountant](/services/mtd-compliance/) typically handles this enrolment as part of the migration package.
What if my 2024-25 return is not yet filed?
A 2024-25 Self-Assessment return filed after October 2025 may not be in HMRC's threshold sweep, meaning no notification letter arrives. This does not exempt the landlord from MTD; HMRC reserves the right to reassess threshold status based on filed returns, and late entry into MTD with backdated quarterly catch-up is administratively painful. Filing the 2024-25 return by July 2025 (the rolling-amendment deadline) is the safer route.
Can I voluntarily enter MTD if I am below the threshold?
Yes. HMRC accepts voluntary enrolment in MTD ITSA from any taxpayer with self-employment or property income, regardless of threshold. Voluntary enrolment is the practical path for landlords expecting to cross the threshold within 12 to 18 months, because the system runs more smoothly without a mid-tax-year switch. A landlord with £45,000 of gross rent in 2024-25 expecting £55,000 in 2025-26 is well-advised to enter voluntarily from April 2026.