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Your essential guide for all the key dates and deadlines in the UK Accounting Calendar for 2026/2027 April 2026 2025/2026 Tax Year Ends 6th 2026/2027 Tax Year Begins 14th Due date for income tax for the CT61 period to 31 March 2026 19th Automatic interest is charged where PAYE Tax, Student Loans, Class 1 NI, or CIS deductions are not paid by today 19th PAYE quarterly payments are due for small employers for periods 6th January 2025 to 5th April 2026 19th Deadline for employer