Making Tax Digital for Income Tax sounds like a change for sole traders and landlords. They are the ones who report to HMRC.
But if you run an accountancy practice, the real change lands on you. It does not just move the deadline. It multiplies it.
From 6 April 2026, sole traders and landlords with qualifying income over £50,000 must keep digital records. That threshold is based on the 2024-25 tax year. They submit quarterly updates under MTD for Income Tax instead of one annual return. We cover the full timeline in our piece on the MTD timeline. The threshold drops in two further steps after that, pulling more people in.
For your practice, one thing matters most right now. Every client who now has to file this way adds recurring filing dates to your calendar. Not one more line on a spreadsheet.
MTD multiplies the work before anything else changes
Under the old rules, take a client with one trade. 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, say a rental property alongside the trade. Each source runs its own quarterly cycle, so two sources mean eight quarterly submissions a year. Still one year-end reconciliation.
Those updates do not spread evenly through the year. They land on four fixed dates: 7 August, 7 November, 7 February, and 7 May. Every mandated client files on all four dates each year. Each one covers the quarter that just ended. A client with two income sources files twice on each date, eight times a year. Not four quiet weeks of steady work. Four deadline spikes a year.
The 300-client maths, in full
Scale that up to a practice-sized client book.
Take, say, 300 mandated clients, each filing four quarterly updates a year. All of them arriving across those same four deadline spikes, not spread evenly through the calendar. 300 times 4 is 1,200 quarterly submissions a year.
The 2025-26 return is still due by 31 January 2027. It runs alongside the new quarterly cycle, not instead of it.
So the January peak your practice already staffs around does not shrink. It gets a second, quarterly rhythm layered on top. 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 from four submissions a year to eight. Your practice total climbs right along with them.
What a computer worker can do, and what stays yours
Treat it as one pile, and that is where a practice loses the year. Not all of that 1,200 is the same kind of work.
Some of it repeats. Chase the client for statements and receipts. Sort the transactions. Reconcile what came in against what went out. Draft the update.
All of that runs the same way, client after client, quarter after quarter. That makes it work an AI agent can do.
An AI agent is a computer worker that does one job for you. We build them, run them, and check their work every month.
A person still checks every output before anything goes near HMRC. But the agent does the repeating part.
See what an agent does with it in our piece on turning record chasing into agent work.
What does not move is the part that needs a qualified person. A person decides how to treat an odd transaction. A person spots when the numbers don't add up. A person signs off before it reaches HMRC.
That stays exactly where it sits now, with the practitioner who carries the professional responsibility for it.
That is the method behind our Reports service: mapping what an agent can run against what a person must decide. It only touches the volume sitting in front of it. It never touches tax judgment.
Not sure where that line falls across your own client list? Try the free AI readiness assessment. See where the load actually sits before you commit anyone's time to moving it. Seven questions, an instant score.
The soft landing year is a runway, not an excuse to wait
HMRC has built a soft landing into the first year, with no penalty points for a late quarterly update filed in 2026-27. Read it as a year to get the process right, not a reason to wait.
The full penalty mechanics are in our piece on record chasing.
We are not tax advisers, and nothing in this piece is tax advice. For the current thresholds and exemptions, check HMRC's own guidance. It explains how the rules apply to a specific client: gov.uk's Making Tax Digital for Income Tax guidance.
Want to work through where your own client list sits on that 1,200-submission maths? And which pieces of it are worth turning into agent work before the next deadline spike?
Talk to us. We will go through the numbers with you, on the record, before we propose running anything.