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Important Tax Deadlines & Events (Updated For 2026)

It is crucial to stay on top of key tax dates to keep your financial affairs in order. Here’s a friendly reminder of the important tax deadlines this year.

Date	What’s Due
6 April 2026	Start of tax year 2026/27
19 April 2026	PAYE & NIC deductions, and CIS return & tax for period 6–5 April
22 April 2026	PAYE/NIC and CIS payment deadline if paying electronically (for period to 5 April)
19 May 2026	PAYE & NIC deductions, and CIS return & tax for period 6–5 May
22 May 2026	PAYE/NIC and CIS payment deadline if paying electronically
19 June 2026	PAYE & NIC deductions, and CIS return & tax for period 6–5 June
22 June 2026	PAYE/NIC and CIS payment deadline if paying electronically
19 July 2026	PAYE & NIC deductions, and CIS return & tax for period 6–5 July
22 July 2026	PAYE/NIC and CIS payment deadline if paying electronically
31 July 2026	Second Self Assessment payment on account for 2025/26 due
19 August 2026	PAYE & NIC deductions, and CIS return & tax for period 6–5 August
22 August 2026	PAYE/NIC and CIS payment deadline if paying electronically
19 September 2026	PAYE & NIC deductions, and CIS return & tax for period 6–5 September
22 September 2026	PAYE/NIC and CIS payment deadline if paying electronically
19 October 2026	PAYE & NIC deductions, and CIS return & tax for period 6–5 October
22 October 2026	PAYE/NIC and CIS payment deadline if paying electronically
31 October 2026	Paper Self Assessment tax return deadline for 2025/26
19 November 2026	PAYE & NIC deductions, and CIS return & tax for period 6–5 November
22 November 2026	PAYE/NIC and CIS payment deadline if paying electronically
19 December 2026	PAYE & NIC deductions, and CIS return & tax for period 6–5 December
22 December 2026	PAYE/NIC and CIS payment deadline if paying electronically
19 January 2027	PAYE & NIC deductions, and CIS return & tax for period 6–5 January
22 January 2027	PAYE/NIC and CIS payment deadline if paying electronically
31 January 2027	Online Self Assessment filing deadline for 2025/26 & tax due (balancing payment + 1st payment on account for 2026/27)
5 April 2027	End of tax year 2026/27

🔎 Key Points to Note

PAYE & CIS

Returns are due on the 19th of each month for the month ending 5th.
Payments are due on the 22nd if you pay electronically.

Self Assessment

31 October 2026 – paper returns due.
31 January 2027 – online returns due, plus tax and payments on account.

Corporation Tax

Corporation Tax payments are specific to the company’s accounting period end — normally 9 months and 1 day after year end. These aren’t shown here because they vary by company, but we can generate a version personalised to your clients if needed.

General Notes for Annual Updates

This calendar is based on typical UK tax deadlines. Some specific dates may vary based on weekends, public holidays, or changes to tax rules.
Always verify deadlines with HMRC or one of our tax advisors each year to ensure compliance.

Need more information?

At A&C Chartered Accountants, we’re not just accountants; we’re your partners in success. Based in Manchester, our experienced team handles everything from managing limited company and sole trader accounts to expertly navigating tax returns. Beyond financials, we play a crucial role in driving your business’s growth, strategically steering it towards success with confidence and clarity.

To get in touch, fill out a contact form or call on 0161 962 1855.

🔎 Key Points to Note

PAYE & CIS

Self Assessment

Corporation Tax

General Notes for Annual Updates

Need more information?

Inheritance tax reliefs – a welcome U-turn for family businesses and farms

MTD for Income Tax – nearly there

Employment expenses – important change to working from home relief

There’s still time to take control of your year-end tax planning