MTD threshold aggregation requires an individual to combine qualifying gross income from their self-employment and property businesses when deciding whether Making Tax Digital for Income Tax is mandatory. The threshold is not tested separately against each activity, and it is not generally based on taxable profit after expenses.
This distinction can bring an individual within MTD even where neither their sole trade nor their rental activity would cross the threshold independently.
How MTD threshold aggregation works
Qualifying income broadly means total gross income from self-employment and property sources before ordinary business or property expenses.
HMRC’s Making Tax Digital qualifying income rules require the individual’s relevant self-employment and property income to be aggregated. Employment income, dividends, pensions and an individual’s share of partnership profits do not form part of the qualifying-income test.
Suppose an individual has £32,000 of gross sole-trade income and £22,000 as their share of qualifying property income. Their MTD qualifying income is £54,000 even if business expenses and property expenses reduce their combined taxable profit to £25,000.
The test is therefore fundamentally different from the profit figure on which Income Tax is ultimately calculated.
MTD threshold aggregation for jointly owned rental property
Where property is jointly owned, it is normally the individual’s own share of the property income that enters the MTD calculation.
If two siblings own a property equally and total gross rent is £40,000, each would normally have £20,000 of qualifying property income from that property.
An important exception applies where a joint owner is only notified of their share after property expenses have already been deducted. HMRC’s current guidance allows that notified figure to be used for the qualifying-income assessment in those circumstances.
This exception does not convert qualifying income generally into net profit. It addresses the practical position where one joint owner or agent controls the detailed property records and supplies another owner only with their net share.
The beneficial ownership position should still be established correctly before the income share is calculated.
The mandatory thresholds are staged
MTD for Income Tax became mandatory from 6 April 2026 for individuals whose qualifying income for the relevant earlier tax year exceeded £50,000.
The regime extends from 6 April 2027 to individuals exceeding £30,000 of qualifying income and from 6 April 2028 to individuals exceeding £20,000, subject to the detailed qualifying-year and exemption rules.
The staged reduction means that an individual outside mandatory MTD in 2026/27 should not assume that they will remain outside it permanently.
A landlord with £17,000 of qualifying rental income and £15,000 from a sole trade may be below the first £50,000 threshold but can enter scope as the statutory threshold falls.
Partnership income is treated differently
An individual’s share of profit from a partnership does not currently count towards their qualifying-income threshold as an individual partner.
This can produce a result that appears counter-intuitive. An individual may have £40,000 of partnership profit and £22,000 of personally owned rental income, yet only the qualifying property income is considered for this particular MTD threshold test.
By contrast, £25,000 from the person’s own sole trade and £22,000 of personally attributable property income are combined because both are qualifying sources.
The legal structure of a business or property activity therefore matters. Joint property ownership should not automatically be described as a partnership merely because two or more people own the property.
Ceasing one income source does not always remove MTD immediately
The qualifying-income test is based principally on information from an earlier Self Assessment return, so changes in the current year do not necessarily remove a person from mandatory MTD immediately.
HMRC’s guidance includes specific rules for ceased income sources and annualisation where a qualifying source existed for only part of the tax year.
A business closing or a property being sold should therefore be reviewed under the cessation rules rather than assuming quarterly obligations end automatically on the transaction date.
Digital reporting does not replace the final tax calculation
Quarterly updates are based on digital business and property records. They do not represent the final annual taxable profit and should not be treated as four provisional tax returns.
Year-end adjustments, allowances, claims and other tax information continue to be relevant when completing the annual position.
Landlords should therefore reconcile jointly owned rental figures through the appropriate landlord tax calculations, while sole traders and landlords entering the mandatory regime should align their digital records with the wider Self Assessment reporting position.
Disclaimer: This article is provided for general guidance only and does not constitute personal tax, legal or financial advice. The correct tax treatment depends on the specific facts, applicable legislation and HMRC practice at the relevant time. You should contact us for advice tailored to your circumstances before taking or refraining from any action.
