August 2025 TAX DEADLINE DATES
July 2025 TAX DEADLINE DATES
July 4, 2025
AUGUST 2025 TAX DEADLINE DATES
1 August 2025
Payment of corporation tax liabilities for periods ended 31 October 2024 if not liable to pay by instalments.
Outstanding 2023-24 self-assessment tax returns now subject to a penalty of £300 or 5% of tax due, whichever is higher.
2 August 2025
Filing date for form P46(Car) for quarter ended 5 July 2025.
5 August 2025
Quarterly report by employment intermediaries for period 6 April to 5 July 2025.
7 August 2025
VAT return and payment for 30 June 2025 quarter (electronic).
14 August 2025
Quarterly corporation tax instalment payment for large companies.
File paper monthly EC sales list – only relevant to a business based in Northern Ireland selling goods.
19 August 2025
PAYE/CIS for month ended 5 August 2025 if by cheque.
File monthly CIS return.
21 August 2025
File online monthly EC sales list – only relevant to a business based in Northern Ireland selling goods.
Supplementary intrastat declarations for July 2025 – arrivals only for a GB business, arrivals and despatch for a business in Northern Ireland.
22 August 2025
PAYE/National Insurance/student loan payments if paid online.
31 August 2025
Companies House should have received accounts of private companies with 30 November 2024 year end and of public limited companies with 28 February 2025 year end.
Corporate tax self-assessment returns for accounting periods ended 31 August 2025.
Annual adjustment for VAT partial exemption claims, May year end.
