MTD Quarterly Update Deadlines: The Full 2026–27 Calendar
If you’re mandated into Making Tax Digital for Income Tax from April 2026, your reporting calendar has changed completely. Instead of one Self Assessment deadline a year, you now have four MTD deadlines for quarterly updates, plus the familiar 31 January final declaration. Get the shape of these deadlines wrong — especially the fact that each update is cumulative rather than a fresh quarter — and you’ll either panic over nothing or catch yourself out for real. Here’s the full 2026–27 calendar and how it actually works.
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