MTD quarterly deadlines calendar 2026/27

Under MTD you send HMRC a cumulative quarterly update four times a year, then a final declaration to finish the year off. The dates are fixed and the same for everyone, so you can put them in the calendar now. Here’s the schedule for the first mandated tax year, 2026/27.

The standard quarterly deadlines

The pattern is simple: each standard quarter ends on the 5th (5 Jul, 5 Oct, 5 Jan, 5 Apr) and the update is due one month and seven days later (7 Aug, 7 Nov, 7 Feb, 7 May). The very first deadline for the April 2026 cohort is 7 August 2026 — mark it now.

The final declaration

Quarterly updates are running totals, not the finished article. After the tax year ends you make a final declaration — adding any adjustments, reliefs and other income — by the usual 31 January that follows the tax year. For 2026/27 that means 31 January 2028. It replaces the old Self Assessment return; the tax payment dates you’re used to don’t change.

A note on calendar quarters

Some software lets you elect calendar-month quarters — periods ending 30 June, 30 September, 31 December and 31 March instead of the 5ths. The submission deadlines stay the same (7 Aug, 7 Nov, and so on). It can make bookkeeping tidier if your records run to month-end; check whether your chosen tool supports the election.

Don’t miss one

Missed updates accrue penalty points — see the penalties guide. Two simple habits keep you safe: set calendar reminders a week before each date, and use software with a dashboard that nudges you. If you co-own, remember each of you has your own set of these deadlines. Work out your first one with the calculator, then grab the prep checklist. Always confirm current dates on GOV.UK.