01/09/2026
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Important September Accountancy Dates ๐
๐น7th September โ VAT return and payment deadline for businesses with a VAT period ending 31st July 2026, where the standard online deadline applies.
๐ธ19th September โ CIS monthly return deadline for the tax month ending 5th September.
๐น22nd September โ Deadline for electronic payment of PAYE and National Insurance for the tax month ending 5th September.
๐ธ30th September โ Companies House filing deadline for many private limited companies with a 31st December 2025 year end.