Making Tax Digital for Income Tax is usually described as a change to how sole traders and landlords report to HMRC. For the accountancy practices doing that reporting on their behalf, it is better understood as a change to how much reporting there is. The rules do not just move the deadline. They multiply it.
From 6 April 2026, sole traders and landlords with qualifying income over £50,000, based on the 2024-25 tax year, have to keep digital records and submit quarterly updates under MTD for Income Tax rather than a single annual return. The threshold widens in two further steps after that, which we cover in full in our piece on the MTD timeline. For a practice, the detail that matters now is simpler: every client who crosses into scope adds recurring filing events to the calendar, not one more line on a spreadsheet.
MTD for Income Tax multiplies the workload before it changes anything else
Take a client with a single trade. Under the old regime, that is one Self Assessment return a year. Under MTD for Income Tax, it is four quarterly updates plus the year-end process, five filing events instead of one. Add a second income source, a rental property alongside the trade, and each source runs its own quarterly cycle: eight quarterly submissions a year, still landing on one year-end reconciliation.
Those quarterly updates are not spread evenly through the year. They land on four fixed dates: 7 August, 7 November, 7 February and 7 May, depending on which quarter a client's income source falls into. Four deadline spikes a year, not four quiet weeks of steady work.
The 300-client math, shown in full
Scale that to a practice-sized book. Take 300 mandated clients, each filing four quarterly updates a year: 300 times 4 is 1,200 quarterly submissions a year, arriving across those same four deadline spikes rather than spread evenly through the calendar.
The Self Assessment return itself does not disappear. The 2025-26 return is still due by 31 January 2027, running alongside the new quarterly cycle rather than replacing it. The January peak a practice already plans staffing around does not shrink. It gets a second, quarterly rhythm layered on top of it, four times a year, every year.
Treat 1,200 as a floor, not a ceiling. That figure assumes one income source per client. Any client with a trade and a property moves their own count from four submissions a year to eight, and the practice total climbs with them.
What is a function a schedule can run, and what stays judgment
Not all of that 1,200 is the same kind of work, and treating it as one undifferentiated pile is where a practice loses the year. Chasing a client for bank statements and receipts, categorising transactions against a chart of accounts, reconciling what has come in against what has gone out, and assembling a draft quarterly update ready for review: all of that is repeatable. It runs the same way, client after client, quarter after quarter. That makes it a function, not a judgment call, and a function that runs the same way every time is one a scheduled system can carry out, with a person checking the output rather than producing it from scratch. We go through the chasing piece specifically, and what it looks like operated rather than manual, in our piece on turning record chasing into an operable function.
What does not move is the part that needs a qualified person: deciding how an unusual transaction should be treated, spotting when a client's numbers do not add up, signing off the update before it goes to HMRC. That stays exactly where it sits now, with the practitioner who carries the professional responsibility for it. Mapping a workload like this into what a schedule can run and what a person must decide is the method behind our insight operations service. It does not touch tax judgment. It touches the volume sitting in front of it.
If you are not yet sure where that line falls across your own client list, the free AI readiness assessment, seven questions, instant score, is one way to see where the load actually sits before committing anyone's time to moving it.
The soft landing year is a runway, not a reason to wait
HMRC has already built a soft landing into the first year: no penalty points for a late quarterly update filed in 2026-27, though late Self Assessment returns and late payment still carry their usual penalties. Read that as room to get the process right, not as a reason to leave it until the points start counting. The wider penalty model is a straightforward points system: one point per missed submission, a £200 penalty once a client reaches four points, and points that expire after 24 months of on-time filing. A practice that spends the soft landing year building a repeatable process is the same practice that walks into the points-based regime with nothing left to fix.
We are not tax advisers, and nothing in this post is tax advice. For the current thresholds, exemptions and how they apply to a specific client, HMRC's own guidance is the source to check: gov.uk's Making Tax Digital for Income Tax guidance.
If you want to work through where your own client list sits on that 1,200-submission math, and which pieces of it are worth turning into a scheduled function before the next deadline spike, book the free 15-minute audit. We will go through the numbers with you, on the record, before we propose running anything.