Each update builds the year-to-date picture
HMRC clarified its MTD for Income Tax guidance in May 2026: every quarterly update automatically covers the period from the start of the tax year to the end of that update period.[1]
This is easy to overlook if you think in separate quarters. The later update does not replace the need for good earlier records; it refreshes the cumulative income-and-expense position drawn from them. For a sole trader or landlord, that makes a regular reconciliation habit more useful than a one-off rush shortly before the deadline.
What belongs in a quarterly update
HMRC describes quarterly updates as totals of self-employment and property income and expenses. They are summaries, not tax returns, and the software uses digital records to create them.[2]
You only need digital records for self-employment and property income and expenses. HMRC says a record needs the amount, the date income was received or the expense occurred, and the relevant Self Assessment income or expense category.[3]
The practical implication is not to turn every update into a final tax computation. The annual tax return still follows, and is where you review the full-year information, add other income or gains, and deal with reliefs and allowances.[4]
How corrections flow through the year
Digital records should be corrected as soon as an error is found. HMRC’s July 2026 update made that expectation explicit.[5] When an amount is estimated, HMRC says to update the record once it is confirmed; the confirmed figure then appears in the next quarterly update. If the fourth update has already gone, it may need to be resent.[6]
This is why cumulative reporting can be helpful. It creates repeated review points, allowing the next update to reflect a corrected record instead of leaving known errors untouched until the annual return. It does not remove the need to keep evidence or check that a transaction belongs to the correct income source.
A repeatable review routine
Before each update, reconcile the digital record against the source evidence, investigate uncategorised transactions, and check each active self-employment and property source. Then review the cumulative totals for unexpected movements. A large change is not necessarily wrong, but it is a prompt to find the underlying transaction while the context is fresh.
This keeps the quarterly update in its intended role: a current digital summary that supports the final annual return, rather than an isolated filing event.
Sources
- HMRC, Updates to “Use Making Tax Digital for Income Tax” guidance, updated 16 July 2026.
- HMRC, Before you use this guide: send quarterly updates, accessed 6 September 2026.
- HMRC, Create digital records, accessed 6 September 2026.
- HMRC, Before you use this guide: submit your tax return, accessed 6 September 2026.
- HMRC, Updates to “Use Making Tax Digital for Income Tax” guidance, updated 16 July 2026.
- HMRC, Create digital records: estimates, accessed 6 September 2026.