Key Dates for July and August 2026
Keeping track of tax and payroll deadlines can be difficult, particularly when you have several dates to remember throughout the year. Missing a deadline could result in penalties or interest, so it is important to make sure you are aware of what is due and when.
Here are some of the key tax and payroll dates to be aware of during July and August 2026.
Key Dates for July 2026
1 July 2026 – Corporation Tax
Corporation Tax is due for companies with accounting periods ending 30 September 2025.
6 July 2026 – P11D and P11D(b)
The deadline for submitting P11D and P11D(b) forms to HMRC for the 2025/26 tax year is 6 July 2026.
19 July 2026 – PAYE and NIC
PAYE and National Insurance contributions are due for the month ended 5 July 2026. If you pay electronically, the deadline is 22 July 2026.
19 July 2026 – CIS Monthly Return
The deadline for filing the CIS300 monthly return for the month ended 5 July 2026 is 19 July.
19 July 2026 – CIS Tax
CIS tax deducted for the month ended 5 July 2026 is payable by 19 July 2026.
31 July 2026 – Self Assessment
The deadline for paying the second payment on account for the 2025/26 tax year is 31 July 2026.
Key Dates for August 2026
1 August 2026 – Corporation Tax
Corporation Tax is due for companies with accounting periods ending 31 October 2025.
19 August 2026 – PAYE and NIC
PAYE and National Insurance contributions are due for the month ended 5 August 2026. If you pay electronically, the deadline is 22 August 2026.
19 August 2026 – CIS Monthly Return
The deadline for filing the CIS300 monthly return for the month ended 5 August 2026 is 19 August.
19 August 2026 – CIS Tax
CIS tax deducted for the month ended 5 August 2026 is payable by 19 August 2026.
If you are unsure about a deadline or need support with your tax affairs, speak to a member of the Armstrongs team today.
