Calendar
UK tax dates for 2026–27.
The dates most of our clients actually need. Always confirm on GOV.UK if your facts are unusual.
31 Oct 2026Paper Self Assessment for 2025–26 (now passed if you are reading this after the date).
30 Dec 2026File 2025–26 SA if you want the bill collected through your tax code.
31 Jan 2027Online Self Assessment 2025–26 and balancing payment. First payment on account for 2026–27 if it applies.
31 Jul 2027Second payment on account (if you make them).
7 Aug / 7 Nov / 7 Feb / 7 MayTypical MTD for Income Tax quarterly update deadlines for tax-year quarters.
9 months + 1 dayCorporation Tax payment — after your company’s year-end.
12 monthsCT600 due after the accounting period ends.
AnniversaryConfirmation statement at Companies House — your company’s own date, not a national deadline.
We put these on a client calendar when you sign up. Ask us to do that.