Making Tax Digital: Britain Is Rewriting the Rules on How You Report Your Income

For decades, filing a tax return in Britain meant one annual ritual: gather your records, reconcile your income, and submit everything to HMRC by 31 January. That system, largely unchanged since self-assessment was introduced in 1996, is about to be replaced.

Making Tax Digital, or MTD, is the government's programme to move the UK tax system onto permanent digital infrastructure. From 6 April 2026, sole traders and landlords with qualifying income above £50,000 must join MTD for Income Tax Self-Assessment. The threshold falls to £30,000 from April 2027, and to £20,000 from April 2028. Qualifying income means gross receipts from self-employment and property combined, before any expenses are deducted.

The practical effect is substantial. Rather than filing one Self Assessment return a year, eligible taxpayers will be required to keep digital records and submit updates to HMRC every three months, plus a final year-end declaration. That means five submissions annually instead of one, using software compatible with HMRC's systems.

Who is in scope, and when

The rollout is deliberately staged. Around 780,000 people with business or property income over £50,000 will join the MTD service from April 2026, with a further 970,000 joining from April 2027. While the changes are expected to affect 2.9 million individuals in total, recent research suggests that only 30 per cent are currently aware of the reforms, and many have yet to take action.

The threshold is calculated on gross income, not profit. A sole trader with £27,000 in trading income and £26,000 in rental income has a combined qualifying income of £53,000 and would be brought into scope from April 2026, even if each income stream individually sits below the threshold. Limited companies are unaffected. MTD for Corporation Tax remains separately under review.

HMRC will determine eligibility from the most recent self-assessment return. For the 2026 to 2027 tax year, HMRC will assess qualifying income based on the 2024 to 2025 tax return, which had to be submitted by 31 January 2026. Letters are being sent to those identified as being in scope, though the onus remains on the individual to verify their position.

What changes in practice

The shift from annual to quarterly reporting is more than a scheduling change. Under the current system, errors and omissions surface once a year when the return is filed. Under MTD, income and expenditure data flows to HMRC in near real-time, meaning discrepancies are identified far sooner.

The first quarterly return for those entering the scheme in April 2026 will cover the period from 6 April to 5 July 2026, with submission due by 7 August 2026. Quarterly submissions record transactions for the period but do not require tax adjustments, and no payment is calculated from them alone. The annual declaration, due by 31 January each year, remains the point at which the full tax liability is confirmed.

The penalty architecture

From April 2026, HMRC is introducing a points-based penalty system. One penalty point is applied for each missed deadline, and a financial penalty of £200 is imposed once a taxpayer accumulates four points. Late payment penalties are also being restructured on a proportionate basis.HMRC has indicated a soft-landing period during MTD's first year, during which penalties for late quarterly updates may be paused, though standard penalties will apply thereafter.

Exemptions exist but are narrow. They cover those who are digitally excluded due to age, disability, or remote location, as well as certain trustees and non-UK residents with no National Insurance number. Once a taxpayer is enrolled in MTD, they will not normally return to self-assessment unless their qualifying income falls below the threshold for three consecutive years, the business ceases, or HMRC grants a digital exclusion exemption.

The bigger picture

MTD is not a one-off compliance event. It represents a structural change in the relationship between taxpayers and HMRC, one designed to reduce the tax gap, which HMRC estimated at £39.8 billion for the 2022 to 2023 tax year, and to shift tax administration from an annual reckoning to a continuous, software-mediated process.

For the self-employed and landlords who have managed their affairs with spreadsheets and a January scramble for years, the adjustment required is real. The combination of new software, quarterly deadlines, and a parallel final declaration in year one, where the 2025 to 2026 Self Assessment return remains due alongside the first MTD submissions, creates a compressed period of dual obligation that accountants are already flagging as the highest-risk moment of the transition.

The government has signalled this programme will continue to expand. Partnerships are expected to be brought into scope in due course, and the £20,000 threshold, once reached in 2028, would capture the majority of the country's landlord and sole trader population. The digital tax system, in other words, is not approaching a terminus. April 2026 is its opening act.

Making Tax Digital for Income Tax Self-Assessment is administered by HMRC. Thresholds and deadlines cited are as published on GOV.UK as of April 2026.