1 June 2026 – Due date for corporation tax due for the year ended 31 August 2025.
19 June 2026 – PAYE and NIC deductions due for month ended 5 June 2026. (If you pay your tax electronically the due date is 22 June 2026).
19 June 2026 – Filing deadline for the CIS300 monthly return for the month ended 5 June 2026.
19 June 2026 – CIS tax deducted for the month ended 5 June 2026 is payable by today.
1 July 2026 – Due date for corporation tax due for the year ended 30 September 2025.
6 July 2026 – Complete and submit forms P11D return of benefits and expenses and P11D(b) return of Class 1A NICs.
19 July 2026 – Pay Class 1A NICs (by the 22 July 2026 if paid electronically).
19 July 2026 – PAYE and NIC deductions due for month ended 5 July 2026. (If you pay your tax electronically the due date is 22 July 2026).
19 July 2026 – Filing deadline for the CIS300 monthly return for the month ended 5 July 2026.
19 July 2026 – CIS tax deducted for the month ended 5 July 2026 is payable by today.
Source:HM Revenue & Customs | 06-05-2026
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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.
