02/03/2026
đ Key March 2026 Deadlines (UK)
đ 1 March 2026
⢠Corporation Tax payment due for companies with an accounting period ending 31 May 2025
(9 months and 1 day after year end, unless paying by instalments.)
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đ 5 March 2026
⢠Auto-Enrolment pension contributions must be submitted for payroll paid in February 2026
(Most pension providers require submission by the 5th of the following month.)
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đ 7 March 2026
⢠VAT return & payment due for VAT period ending 31 January 2026
(Monthly and relevant quarterly VAT filers.)
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đ 19 March 2026
(If paying by cheque/post)
⢠PAYE, NICs & Student Loan deductions due for tax month ending 5 March 2026
⢠CIS deductions payable to HMRC
⢠CIS return deadline for payments made to subcontractors in the month to 5 March 2026
(Remember: CIS returns must be filed even if no subcontractors were paid.)
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đ 22 March 2026
(If paying electronically)
⢠Electronic payment deadline for PAYE, NICs, Student Loans & CIS deductions
(For period ending 5 March 2026.)
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đ 31 March 2026 â Financial Year End Planning
This is a key date for tax planning before the new tax year begins on 6 April.
⢠Last chance to use 2025/26 tax allowances
⢠Consider:
⢠Capital Allowances & AIA claims
⢠Pension contributions
⢠Dividend planning
⢠Bonus timing
⢠R&D claims (where applicable)
⢠Year-end stock adjustments
For businesses with a 31 March year end, this is also your financial year closing date â meaning Corporation Tax and accounts planning should already be underway.
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â ď¸ Common March Pressure Points
⢠Cashflow tightening before year-end
⢠Last-minute tax planning decisions
⢠CIS errors discovered late
⢠Dividends declared without reviewing profit position
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âł Looking Ahead
⢠New tax year begins 6 April 2026
⢠Making Tax Digital for Income Tax goes live from April 2026 for qualifying sole traders & landlords
⢠Now is the time to review:
⢠Profit extraction strategy
⢠VAT schemes
⢠Payroll structure
⢠Growth plans for 2026/27