The Making Tax Digital for Income Tax Self Assessment threshold test is at the gross figure. Not the net. The single point that produces more wrong answers than anything else in MTD readiness conversations is this: a landlord intuitively thinks of their tax position as net rental profit after expenses, and they intuitively apply the £50,000 (or £30,000, or £20,000) threshold to that net figure. The test is not net-based. It is gross-based, and the difference between gross and net for a typical property business is substantial. A landlord with £52,000 of gross rental income and £40,000 of allowable deductions (producing £12,000 of net profit) is in scope of the April 2026 mandate. The £12,000 net profit is irrelevant to the threshold test; the £52,000 gross figure is what matters.

This page is the technical-definition layer of the MTD ITSA pillar. It is the page to read when you are at the threshold-test moment (typically the year before each successive mandate date), and you need a yes / no answer on whether you are in scope. It walks the regulation 25 definition under SI 2026/336 (which replaced SI 2021/1076 regulation 20 on 1 April 2026), the aggregation rule, the exclusion catalogue, the joint-property treatment, the letting-agent trap, and the cross-stream boundaries to limited companies and pension funds. Six worked examples follow, each chosen for a specific definitional point that lands more sharply through illustration than through abstract text.

The companion pages cover wider angles. Our MTD orientation page is the four-axis system-overhaul overview. Our joint-owner page is the primary deep-dive for spouses and other joint owners. Our exit-on-income-drop page covers the regulation 22 three-tax-year exemption. Our limited-company MTD page covers the LtdCo cross-stream boundary in detail. This page is the input-definition deep-dive; the others cover what happens once you have the answer.

The regulation 25 definition (SI 2026/336)

SI 2026/336 regulation 25 defines qualifying income for the MTD ITSA threshold test. The new SI revoked SI 2021/1076 on 1 April 2026; the substantive definition carries over from the prior regulation 20 of the 2021 Regulations with the regulation number renumbered to 25 under the 2026 Regulations. The operative components:

  • Gross self-employment turnover. Turnover from any UK-taxable trade or profession run by the individual, before deductions for expenses, capital allowances, or any other adjustments. The Adam Smith definition of turnover: what the customers paid for the goods and services in the period.
  • Gross property rental income. Rent collected on UK or foreign property held by the individual, before deductions for agent fees, repairs, insurance, finance costs, council tax voids, or any other allowable deduction. The pre-expenses top-line figure.
  • Aggregation. The two streams are added together. A landlord with both self-employment and rental tests the combined figure against the threshold, not either stream alone.
  • Test year. The threshold is tested against the SA return for the relevant test year. For the April 2026 mandate, the test year is 2024/25 (SA return filed by 31 January 2026). For April 2027, 2025/26. For April 2028, 2026/27.

The definition is procedurally simple but operationally consequential. The gross-not-net point is the difference between being in scope or out for a meaningful proportion of the landlord population.

Why the gross-not-net point matters more than any other input

Three reasons.

The Section 24 finance-cost restriction makes the gap structurally wide

For non-corporate landlords from 2020/21 onwards, mortgage interest is restricted to a 20% basic-rate tax reducer; it does not reduce rental income for income-tax purposes the way it used to. The change widens the gap between gross rental income and net profit substantially. A leveraged landlord with £52,000 of gross rent and £20,000 of mortgage interest had a net profit (pre-S24) close to the £32,000 figure that would naturally cross the old £30,000 threshold; under the post-S24 regime, the £20,000 interest does not depress net profit at all (it operates as a tax reducer separately), so the net profit looks similar but the comparison against the threshold is now done on a gross basis where the £20,000 interest is irrelevant.

Landlord intuition runs the wrong way

Most landlords think about their tax position in net terms. "How much did I actually make from the property this year." That mental model is correct for income-tax-liability purposes (the tax is computed on net rental profit, with the Section 24 adjustment for finance costs) but wrong for the MTD ITSA threshold test. The regulation 25 definition prioritises the gross figure for scope purposes precisely because the gross figure is more stable and less judgement-laden than the net (no expense categorisation arguments, no capital-vs-revenue boundary calls).

HMRC is targeting the net-low / gross-high cohort

HMRC's outreach communications on MTD readiness explicitly identify the net-low / gross-high cohort as the largest population at risk of misunderstanding their scope. The £52,000-gross / £12,000-net profile is the headline. A landlord who reads their accountant's net-profit summary and concludes "I am safely below the threshold" without checking the gross figure can miss the mandate notice and incur compliance penalties under the FA 2021 Schedule 24 points regime once the live mandate engages.

The aggregation rule for trade and rental crossover

Regulation 25 of SI 2026/336 aggregates self-employment turnover and rental income for the threshold test. A landlord-trader who runs a small consultancy and holds a BTL property is tested on the combined figure.

Worked combinations:

  • £30,000 trade turnover plus £25,000 rental gross equals £55,000 combined. In scope April 2026 via aggregation, despite both streams individually being below £50,000.
  • £40,000 trade turnover plus £15,000 rental gross equals £55,000 combined. In scope April 2026 by the same logic.
  • £25,000 trade turnover plus £25,000 rental gross equals £50,000 combined. Not above £50,000, so not in scope April 2026; in scope April 2027 when the £30,000 threshold engages.
  • £12,000 trade turnover plus £18,000 rental gross equals £30,000 combined. Not in scope April 2026; not in scope April 2027 (£30,000 is not above £30,000); in scope April 2028 when the £20,000 threshold engages.

The aggregation rule trips landlords who reason "neither my trade nor my rental alone is above the threshold". The reasoning is wrong; the streams are added. Sessions writing should make this point explicit; the combined-stream cohort is materially smaller than the gross-not-net cohort but still operationally significant for sole-trader-plus-landlord populations.

What is excluded from qualifying income

Six categories sit outside the regulation 25 definition. Each has an operational reason.

Employment income (PAYE)

Pay From Pay As You Earn employments is not qualifying income. PAYE reporting runs on the employer's RTI obligations to HMRC, not on the landlord's SA position. A landlord who is a high-earning employee with £150,000 of PAYE income plus £25,000 of rental income tests only the £25,000 against the threshold. The £150,000 PAYE income is irrelevant for MTD ITSA scope.

Pensions

Pension income is taxed through PAYE or via self-assessment but is not qualifying income for MTD ITSA scope. A retired landlord drawing £40,000 of pension and £25,000 of rental tests the £25,000 against the threshold.

Dividends and savings interest

Investment income (dividends from shares, savings interest, REIT distributions) sits outside qualifying income. A landlord with substantial investment income alongside rental tests only the rental stream against the threshold.

Partnership profit shares (currently deferred)

Partnership profit shares from general partnerships are excluded for now because the partnership MTD phase is deferred with no confirmed go-live date. When the partnership phase eventually commences, partnership profit shares will likely come into scope; sessions writing should treat this as a forward-watch point rather than a current input. LLPs follow the partnership treatment.

Limited-company rental income

A landlord with property held in a limited company tests only the personal-stream rental against the threshold. The LtdCo's rental income is the company's income for Corporation Tax purposes, filed on a CT600. It does not flow through to the director-shareholder's SA return as rental income; it appears (if at all) as dividends or salary, which are themselves excluded from qualifying income.

Pension-fund-held property rental

A landlord with a SIPP or SSAS holding commercial property tests only the personal-portfolio gross against the threshold. The pension fund's rental is the scheme's income, not the landlord's. Pension fund trustees are excluded from MTD ITSA entirely.

The threshold timeline by cohort

The phased threshold introduction produces three landlord cohorts. Each tests qualifying income against the threshold for a specific test year.

April 2026 cohort: £50,000 tested against 2024/25

Landlords whose qualifying income exceeded £50,000 in 2024/25 are mandated from 6 April 2026. HMRC writes to these landlords in autumn 2025 confirming the mandate, based on the 2024/25 SA return filed by 31 January 2026. The 2024/25 figure is the operative threshold-test data; landlords filing for 2024/25 should be aware that the gross qualifying-income figure on the return is what determines first-cohort eligibility.

April 2027 cohort: £30,000 tested against 2025/26

Landlords whose qualifying income exceeded £30,000 in 2025/26 (and was below £50,000 in 2024/25) are mandated from 6 April 2027. The threshold-test data is the 2025/26 SA return filed by 31 January 2027. This cohort has an additional year of runway compared to the April 2026 cohort and can use 2026/27 as a voluntary pilot year.

April 2028 cohort: £20,000 tested against 2026/27

Landlords whose qualifying income exceeded £20,000 in 2026/27 (and was below £30,000 in 2025/26) are mandated from 6 April 2028. The threshold-test data is the 2026/27 SA return filed by 31 January 2028. The £20,000 threshold brings most accidental landlords with one or two BTL properties into scope; the cohort is the largest by population.

Below-threshold landlords

Landlords with qualifying income below £20,000 remain outside MTD ITSA indefinitely on current policy. They continue on the legacy annual SA cycle with the Schedule 55 and Schedule 56 Finance Act 2009 penalty regimes. Voluntary opt-in remains available for landlords who want to participate despite being below threshold.

Worked example 1: gross-not-net headline (the most common misconception)

Pevensey-Estate holds 3 BTL properties personally. 2024/25 gross rental income is £52,000. Allowable deductions are agent fees £4,800, repairs £8,200, insurance £1,400, council tax voids £2,100, finance costs £18,500 (under the Section 24 restriction, these reduce tax by 20% rather than reducing rental income), other £5,000. Net profit is £12,000 after the £40,000 of deductions.

The intuitive (wrong) test

Pevensey-Estate reads the accountant's summary showing £12,000 net rental profit. The intuitive reasoning: "I only made £12,000 this year, well below the £50,000 threshold; I am not in scope of MTD ITSA at April 2026."

The regulation 25 test

SI 2026/336 regulation 25 tests gross rental income, not net profit. Pevensey-Estate's gross figure is £52,000, which is above the £50,000 April 2026 threshold. Pevensey-Estate is in scope from 6 April 2026.

The Section 24 dimension

Under the pre-2017 regime, Pevensey-Estate's £18,500 of mortgage interest would have been deducted from rental income before computing the net profit, producing a net profit of around £30,500 rather than £12,000. The post-Section 24 regime treats finance costs as a 20% tax reducer separately. The net profit under the new regime looks much lower than it would have under the old regime, but the gross figure (which the MTD threshold uses) is the same. Sessions writing should make this point explicit: Section 24 widens the gap between gross and net, which makes the gross-not-net point more important than it was pre-2017.

The operational point

Pevensey-Estate is the headline misconception. The "net-low / gross-high" landlords are the largest population HMRC's outreach is targeting. The takeaway: check the gross figure on the SA return when assessing MTD scope, not the net profit.

Worked example 2: aggregation across trade and rental

Quenington-Estate runs a small consultancy with 2024/25 gross self-employment turnover of £30,000. Allowable expenses are around £8,000, producing net self-employment profit of £22,000. Quenington-Estate also holds 1 BTL property with 2024/25 gross rental income of £25,000 and allowable deductions of £9,000, producing net rental profit of £16,000.

The intuitive (wrong) test

Neither stream alone is above the £50,000 threshold (£30,000 trade is below; £25,000 rental is below). The intuitive reasoning: "I am out of scope at April 2026 because neither stream alone crosses £50,000."

The regulation 25 test

Regulation 25 of SI 2026/336 aggregates the two streams. £30,000 trade plus £25,000 rental equals £55,000 combined qualifying income, which is above £50,000. Quenington-Estate is in scope from 6 April 2026 via aggregation.

The operational point

Landlord-traders are the second-largest misclassification cohort. The aggregation rule is straightforward but counter-intuitive to anyone who is used to thinking about the two streams separately. The discipline is to compute combined gross qualifying income annually at the threshold-test exercise; the figure is one addition operation and produces the right answer.

Worked example 3: joint property with a Form 17 election

Rochester-Estate and spouse are joint owners on a 4-property residential portfolio. 2024/25 gross rental income across the portfolio is £100,000. They are considering a Form 17 election to split the income 75/25 in favour of the lower-rate spouse for income-tax efficiency. Default treatment absent any election is 50/50.

Default 50/50 threshold test

Each spouse tests £50,000 (the 50% share of the £100,000 total) against the £50,000 April 2026 threshold. The regulation 25 phrasing requires income "above" £50,000; £50,000 itself is not above £50,000. Neither spouse is in scope at April 2026 on the default 50/50 split. Both spouses come in scope at April 2027 when the £30,000 threshold engages (£50,000 is above £30,000).

Form 17 75/25 threshold test

The 75% spouse tests £75,000 (the 75% share). £75,000 is above £50,000; the 75% spouse is in scope from April 2026. The 25% spouse tests £25,000 (the 25% share). £25,000 is below £50,000 and below £30,000 but above £20,000; the 25% spouse is in scope from April 2028.

The trade-off

The Form 17 election is principally a tax-planning instrument: it uses both spouses' Personal Allowances and lower-rate bands to reduce the combined income-tax bill on the rental income. The MTD ITSA threshold-testing consequence is a secondary effect. For the Rochester-Estate facts, the 75/25 election brings the higher-share spouse into MTD ITSA scope one year earlier than would otherwise be the case. The income-tax saving from the Form 17 election typically dominates the additional MTD admin cost, but the timing-of-MTD-adoption dimension is worth noting in the planning conversation.

The joint-property anchor

Under SI 2026/336 (which from 1 April 2026 replaced the joint-property treatment previously at SI 2021/1076 regulation 21), each joint owner tests their share of gross rental income against the threshold. The share-of-gross rule operates per individual. HMRC's published view is that joint-owner threshold testing follows the SA income-split rule applied to the joint property (default 50/50 or Form 17 election as filed), not a separate MTD-specific joint-test rule.

Worked example 4: the letting-agent net-of-fees trap

Stapleford-Estate's 5 BTL properties are managed by letting agents. Each month, agents collect rent from tenants, deduct agent commission, management fees, and sometimes maintenance contractor invoices, and pay the net to the landlord's bank account. 2024/25 agent statements show: gross rent collected £75,000; agent commission and management £9,000; maintenance and repairs handled by the agent £4,000; net paid to Stapleford-Estate £62,000.

The trap framing

Stapleford-Estate sees £62,000 hitting the bank account through the year. The intuitive treatment of this as "rental income" produces a £62,000 figure for the threshold test. On these facts the answer happens to be the same (£62,000 is above the £50,000 threshold; Stapleford-Estate is in scope April 2026 either way), but the framing is wrong, and on borderline facts it produces the wrong answer.

The borderline-facts variant

Stapleford-Lite-Estate has a smaller portfolio. 2024/25 agent statements show: gross rent collected £52,000; agent commission and management £8,000; net paid £44,000. The "net-paid-as-rental" framing gives £44,000, which is below the £50,000 threshold; the landlord would conclude not in scope at April 2026. The correct regulation 25 framing uses the gross collected by the agent (£52,000), which is above the threshold; the landlord is in scope from April 2026. The misframing flips the answer.

The regulation framework

The landlord is the MTD filer (not the letting agent). The threshold-test input must use the gross rent collected by the agent (the figure before any deductions, however administered). The agent commission, management fees, and other agent-administered deductions are allowable expenses against the rental income for income-tax purposes; they are not netted off the gross figure for MTD ITSA threshold testing.

When testing the MTD threshold for an agent-managed portfolio, request the agent statement summary showing gross rent collected for the tax year. The figure may differ materially from the net-paid-to-landlord figure on bank statements. Use the gross figure.

Want this checked against your specific situation?

Drop your email and a one-line summary. We reply within 24 hours, no phone call needed.

Worked example 5: the limited-company cross-stream boundary

Thirling-Estate holds 2 BTL properties personally with 2024/25 gross rental income of £45,000. Thirling-Estate is also sole director and shareholder of a property LtdCo holding 3 further properties with rental income of £62,000 in the company's accounting period ending 31 March 2025.

The mis-aggregation framing

Thirling-Estate sees combined gross rental across both ownership structures of £107,000 and concludes "I am clearly in scope at April 2026". The reasoning aggregates the LtdCo income into the personal-stream test, which is wrong.

The correct threshold test

Only the personal-stream rental is tested against the MTD ITSA threshold. £45,000 personal-stream gross is below the £50,000 April 2026 threshold; Thirling-Estate is not in scope at April 2026. The personal-stream is above the £30,000 April 2027 threshold (assuming 2025/26 stays around £45,000), so Thirling-Estate comes in scope from 6 April 2027 on the personal-stream alone.

The LtdCo treatment

The LtdCo's £62,000 rental income is the company's income for Corporation Tax purposes. It is filed on a CT600 under the existing CT framework with the company's standard accounting-period deadlines. The company is outside MTD ITSA entirely; it follows the future MTD for CT cycle (no go-live date announced) plus current MTD for VAT obligations if the company is VAT-registered.

The operational point

The mis-aggregation trap is common for landlords with both personal and LtdCo holdings. The discipline is to keep the two streams separate: the personal-stream tests against the MTD ITSA threshold; the LtdCo files on the CT side under its own framework. See our LtdCo MTD page for the company-side picture.

Worked example 6: the SIPP / SSAS pension-fund-held property exclusion

Underbrook-Estate holds 1 BTL property personally with 2024/25 gross rental income of £28,000. Underbrook-Estate also has a self-administered SIPP that holds 1 commercial property let to a connected business; the gross rental to the SIPP is £35,000 in the same period.

The threshold-test analysis

Only the personal-stream is tested. £28,000 personal-stream gross is below the £50,000 April 2026 threshold and below the £30,000 April 2027 threshold. At the £20,000 April 2028 threshold, the £28,000 personal-stream is above; Underbrook-Estate comes in scope from 6 April 2028.

The SIPP-stream treatment

The SIPP's £35,000 rental is the scheme's income, not Underbrook-Estate's. Pension fund trustees are excluded from MTD ITSA. The SIPP files via the scheme's own reporting framework: annual SIPP / SSAS administrator filings to HMRC plus the connected-party rules under the Finance Act 2004 pension regime.

The operational point

The SIPP / SSAS cross-stream boundary works similarly to the LtdCo cross-stream boundary. The pension fund is a separate taxpayer for tax purposes; its rental income is not part of the landlord's qualifying-income test. Sessions writing should not aggregate SIPP / SSAS rental with personal-portfolio rental.

Foreign property income: the standard treatment and the narrow exclusion

Foreign property income counts as property income for MTD where reported on the UK return. For a UK-tax-resident landlord who owns a Spanish holiday let or a French apartment and reports the foreign rental on the UK SA return under the foreign-property pages, the gross foreign rental is qualifying income alongside any UK rental.

The narrow exclusion applies to non-MTD reporting routes. A non-resident landlord whose UK rental is reported under the Non-Resident Landlord scheme with 20% withholding (where no NRL1 gross-payment approval is in place) is in a specific reporting framework that interacts with MTD ITSA differently. Verify the specific reporting route at write time; the boundary is in regulation 25 of SI 2026/336 and the related HMRC guidance.

The default treatment for the typical foreign-property landlord (UK-resident, owning offshore rental, reporting on the UK return) is straightforward: gross foreign rental counts as qualifying income for MTD threshold purposes.

The voluntary opt-in pathway

Landlords below the threshold can join MTD voluntarily from 6 April 2025 (pilot) or 6 April 2026 (general voluntary). Voluntary participants run the full quarterly cycle plus EoPS plus final declaration and are bound by the FA 2021 Schedule 24 points-based late-submission regime and the Spring Statement 2025 accelerated late-payment cascade for the periods they participate.

Voluntary opt-in is most useful for:

  • Landlords whose income is trending upward and who anticipate crossing the threshold in 2025/26 or 2026/27. The voluntary year is a planning window before the mandate bites.
  • Landlords with multiple income streams (sole trade plus rental) who want to integrate the quarterly bookkeeping ahead of the mandate to smooth the operational transition.
  • Landlords whose accountant is recommending early adoption to align the practice's workflow.

Voluntary opt-in is less useful for landlords whose income is structurally below the threshold and likely to stay there, or for landlords with significant seasonal income variability who would face the points-based penalty regime against legitimate periodic submission challenges. The decision is judgement-based; the threshold-test rules in this page still inform whether to opt in (the threshold determines mandate timing; the opt-in is a strategic choice rather than a compliance obligation).

The £10,000 abandoned threshold: a stale-reference watchpoint

A recurring source of confusion in landlord-facing content. The original 2018 MTD ITSA design used a £10,000 qualifying-income threshold for all sole traders and landlords. The threshold was scheduled to take effect from April 2018, then deferred to April 2019, then deferred to April 2024 as the technical and operational challenges of the build accumulated. In late 2022 and early 2023, the previous government abandoned the £10,000 threshold entirely and replaced it with the phased £50,000 / £30,000 / £20,000 schedule announced on 19 December 2022.

The £10,000 figure still appears on many 2019 to 2022 competitor pages that have not been updated. A landlord researching MTD qualifying income on the web in 2026 will encounter the £10,000 figure on a meaningful proportion of pages and may be misled. The operative thresholds are £50,000 (April 2026), £30,000 (April 2027), and £20,000 (April 2028). Treat any reference to the £10,000 threshold as stale.

The threshold-test discipline at the test moment

Five steps for a landlord at the threshold-test moment (typically the autumn or winter before each mandate year).

  1. Identify the relevant test year and threshold. 2024/25 against £50,000 for the April 2026 mandate; 2025/26 against £30,000 for the April 2027 mandate; 2026/27 against £20,000 for the April 2028 mandate.
  2. Compute gross qualifying income for the test year. Gross self-employment turnover plus gross property rental income. Use the gross figures from the SA105 (property pages) and the SA103 (self-employment pages) on the SA return, before any deduction.
  3. Apply the joint-property share-of-gross rule. If property is jointly owned, take the landlord's share of gross (default 50/50, or per the Form 17 election if filed), not the property's total gross.
  4. Exclude the cross-stream items. Limited-company rental income, pension-fund-held property rental, partnership profit shares, employment income, pensions, dividends, savings interest. None of these aggregates into the personal-stream qualifying income.
  5. Test the gross figure against the relevant threshold. Above means in scope; at or below means not in scope at this mandate, with the next mandate threshold becoming the test for the following year.

The discipline is procedurally simple but requires careful application to the specific facts. For agent-managed portfolios, use the gross-rent-collected figure (not net-paid-to-landlord). For Form 17 elections, use the elected split percentage. For mixed personal-and-LtdCo holdings, isolate the personal stream. For SIPP / SSAS holdings, isolate the personal stream.

How this page sits with the other MTD pages on this site

This page is the technical-input deep-dive on qualifying income. Companion MTD pages cover other angles:

  • Our MTD orientation page covers the four-axis system-overhaul overview: filing frequency, record form, software requirement, and agent route. The orientation page is the headline-level read for landlords coming to MTD for the first time.
  • Our exit-on-income-drop page covers the three-tax-year exemption under SI 2026/336 regulation 24 (previously SI 2021/1076 regulation 22 before the 1 April 2026 revocation) for landlords whose income falls below the threshold after entering the regime.
  • Our joint-owner MTD page is the primary deep-dive for spouses and other joint owners, covering Form 17 mechanics, default 50/50 split, and the joint-owner-specific operational considerations.
  • Our limited-company MTD page covers the LtdCo cross-stream boundary in detail, including MTD for VAT (in scope if registered) and the future MTD for CT (no go-live date).
  • Our MTD penalty-and-exemption page covers the FA 2021 Schedule 24 points regime, the Spring Statement 2025 accelerated cascade, and the regulation 18 / 20 / 24 / 25 / 27 exemption categories under SI 2026/336.
  • Our SA late-filing and late-payment penalties page covers the parallel legacy Schedule 55 plus Schedule 56 Finance Act 2009 regime for below-threshold landlords.

Read this page if your question is "am I in scope". Read the orientation page if your question is "what is changing in MTD". Read the joint-owner page if your question is specifically about jointly-owned property treatment. Read the exit page if your question is "I was in scope but my income dropped". Read the penalty page if your question is "what happens if I miss obligations once in scope".

If you would like a precise threshold-test calculation on your specific facts (the gross-vs-net point as applied to your portfolio, the aggregation if you have multiple income streams, the agent-statement gross figure for an agent-managed portfolio, the joint-property share-of-gross with or without Form 17, and the cross-stream isolation for any LtdCo or pension-fund holdings), we work with landlords on the threshold-test exercise. The autumn-before-mandate window is the right time to confirm scope and to start the software-selection and ASA-authorisation runway. Getting the threshold answer right is the first step; the rest of the MTD readiness work follows from it.