Key Tax Dates 2026/27

Never miss a deadline — all key HMRC and Companies House dates in one place.

2026/27 Tax Calendar

Key Tax & Filing Deadlines

Dates shown are for guidance only — your specific deadlines may differ based on your company's accounting period or individual circumstances. Contact us if you are unsure.

April – June 2026

6 April 2026	New tax year begins — 2026/27
5 April 2026	Deadline to use 2025/26 ISA allowance
19 April 2026	PAYE/NIC payment deadline (non-electronic)
30 April 2026	Corporation tax payment due (companies with 31 Jan year-end)
31 May 2026	P60s must be issued to all employees

July – September 2026

6 July 2026	P11D and P11D(b) filing deadline
19 July 2026	Class 1A NIC payment deadline
31 July 2026	Second payment on account due (self-assessment)
31 August 2026	Confirmation statement deadline (varies by company)

October – December 2026

1 October 2026	Corporation tax filing deadline (31 Dec year-end companies)
31 October 2026	Paper self-assessment return deadline
5 October 2026	Register for self-assessment (new taxpayers)

January – March 2027

31 January 2027	Online self-assessment return filing deadline
31 January 2027	Balance of tax and first payment on account due
1 February 2027	5% surcharge on unpaid 2025/26 tax
31 March 2027	End of corporation tax year (many companies)

Need a Reminder Service?

We track all your deadlines and alert you in advance. Get in touch to find out more.

Book a Free Consultation Call 020 8432 3000