Tax Diary February/March 2026

1 February 2026 – Due date for Corporation Tax payable for the year ended 30 April 2025.

19 February 2026 – PAYE and NIC deductions due for month ended 5 February 2026. (If you pay your tax electronically the due date is 22 February 2026)

19 February 2026 – Filing deadline for the CIS300 monthly return for the month ended 5 February 2026.

19 February 2026 – CIS tax deducted for the month ended 5 February 2026 is payable by today.

1 March 2026 – Due date for Corporation Tax due for the year ended 31 May 2025.

2 March 2026 – Self-Assessment tax for 2024-25 paid after this date will incur a 5% surcharge unless liabilities are cleared by 1 April 2026, or an agreement has been reached with HMRC under their time to pay facility by the same date.

19 March 2026 – PAYE and NIC deductions due for month ended 5 March 2026 (If you pay your tax electronically the due date is 22 March 2026).

19 March 2026 – Filing deadline for the CIS300 monthly return for the month ended 5 March 2026.

19 March 2026 – CIS tax deducted for the month ended 5 March 2026 is payable by today.

Aitch

Aitch is the visionary founder and CEO of CIGMA Accounting Ltd, a boutique accounting and tax advisory firm with offices in Wimbledon and Farringdon, London. With over a decade of experience, Aitch has built a reputation for strategic tax planning, complex HMRC compliance resolution, and innovative AI-powered accounting workflows that help SMEs, landlords, and high-net-worth clients streamline their finances. His expertise spans corporation tax, inheritance tax planning, R&D tax credit claims, capital allowances, and international tax matters, making him a trusted advisor for clients seeking to minimise tax liabilities while staying fully compliant. Aitch is passionate about bridging traditional accounting principles with cutting-edge digital solutions, allowing businesses to operate efficiently and future-proof their financial systems. Through CIGMA, he aims to make accounting smarter, faster, and more human-centric - empowering clients to focus on growth while staying ahead of regulatory changes.

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