Specialist Tax News

Diary of main tax events September / October 2025

Date What’s Due
1 September Corporation Tax for year to 30/11/2024, unless quarterly instalments apply
19 September PAYE & NIC deductions, and CIS return and tax, for month to 05/09/2025 (due 22/09 if you pay electronically)
1 October Corporation Tax for year to 31/12/2024, unless quarterly instalments apply
5 October Deadline for notifying HMRC of chargeability, if not already within Self-Assessment, for 2024/25
19 October PAYE & NIC deductions, and CIS return and tax, for month to 05/10/2025 (due 22/10 if you pay electronically)