UK Tax Filing Deadlines:

March to August 2026

Missing a tax deadline is expensive.

Interest. Automatic penalties. Escalating surcharges. And unnecessary stress.

This guide sets out the key UK tax and statutory filing deadlines from March to August 2026 so business owners, landlords and company directors can stay compliant and plan ahead.

If you would rather not track these dates yourself, our tax team can manage the process for you.

March 2026 Tax Deadlines

2 March 2026 – Deadline to pay any outstanding 2024 to 2025 Self Assessment tax to avoid a 5% surcharge.
7 March 2026 – VAT return and payment deadline for monthly and quarterly VAT periods ending 31 January 2026.
19 March 2026 – PAYE and Class 1 NIC payment due by post for February payroll.
22 March 2026 – PAYE and Class 1 NIC payment due electronically for February payroll.

Why March matters

If you missed the 31 January Self Assessment payment deadline, 2 March is your final opportunity to avoid an automatic 5% surcharge.

April 2026 Tax Deadlines

5 April 2026 – End of the 2025 to 2026 tax year.
6 April 2026 – Start of the 2026 to 2027 tax year.
19 April 2026 – PAYE and NIC payment deadline by post for March payroll.
22 April 2026 – PAYE and NIC payment deadline electronically for March payroll.
30 April 2026 – Corporation Tax payment deadline for companies with a 31 July 2025 year end.

Planning opportunity before 5 April

5 April is your final chance to use allowances for the 2025 to 2026 tax year including:

Dividend allowance
Capital Gains Tax annual exemption
Pension contributions
ISA subscriptions

Proactive planning before this date can materially reduce your tax bill.

May 2026 Tax Deadlines

7 May 2026 – VAT return and payment deadline.
19 May 2026 – PAYE and NIC payment deadline by post for April payroll.
22 May 2026 – PAYE and NIC payment deadline electronically for April payroll.
31 May 2026 – Deadline to issue P60s to employees for the 2025 to 2026 tax year.

P60 compliance reminder

All employers must provide employees with a P60 by 31 May. Failure to do so can result in penalties and employee disputes.

June 2026 Tax Deadlines

7 June 2026 – VAT return and payment deadline.
19 June 2026 – PAYE and NIC payment deadline by post for May payroll.
22 June 2026 – PAYE and NIC payment deadline electronically for May payroll.

Companies with a 30 September 2025 year end must file accounts with Companies House by 30 June 2026.

July 2026 Tax Deadlines

6 July 2026 – Deadline to submit P11D and P11D(b) forms for employee benefits and expenses.
7 July 2026 – VAT return and payment deadline.
19 July 2026 – PAYE and NIC payment deadline by post for June payroll.
22 July 2026 – PAYE and NIC payment deadline electronically for June payroll.
31 July 2026 – Second payment on account due for 2025 to 2026 Self Assessment.

Self-assessment payment on account explained

If your previous tax bill exceeded £1,000, you may need to make advance payments towards your next year’s tax. 31 July is the second instalment deadline.

August 2026 Tax Deadlines

7 August 2026 – VAT return and payment deadline.
19 August 2026 – PAYE and NIC payment deadline by post for July payroll.
22 August 2026 – PAYE and NIC payment deadline electronically for July payroll.

Companies with a 31 October 2025 year end must pay Corporation Tax by 1 August 2026.

Common Questions About UK Tax Deadlines

What happens if you miss a tax deadline?

HMRC can issue automatic penalties, daily fines, interest charges and surcharges depending on the tax involved. Repeated non compliance increases penalty severity.

Are VAT deadlines always the 7th of the month?

VAT returns and payments are usually due one calendar month and seven days after the end of the VAT period.

When are Self Assessment payments due in 2026?

The second payment on account for the 2025 to 2026 tax year is due on 31 July 2026.

How do I know my Corporation Tax deadline?

Corporation Tax is generally due nine months and one day after the end of your company’s accounting period.

Need Help Managing Your Deadlines?

Tracking multiple tax and compliance dates is time consuming and risky if handled incorrectly.

At RiverView Portfolio, we manage tax compliance for SMEs, property businesses and company directors across the UK. We ensure returns are filed accurately and on time while identifying planning opportunities throughout the year.

Contact us today to ensure your 2026 deadlines are handled properly.

📧 enquiries@riverviewportfolio.co.uk
🌐 https://www.riverviewportfolio.co.uk
☎ 01249 816810