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Date Deadline / Event Who It Applies To
6 April 2026 Start of 2026/27 Tax Year Everyone
31 May 2026 P60s must be issued for 2025/26 Employers
6 July 2026 Deadline for P11D submission & Class 1A NIC reporting Employers
22 July 2026 Pay Class 1A NIC (19 July if by post) Employers
31 July 2026 Second Payment on Account (for 2025/26 tax bill) Self-employed / Higher earners
5 October 2026 Register for Self Assessment (if newly self-employed in 25/26) Self-employed / New taxpayers
31 October 2026 Paper Self Assessment return deadline Individuals
30 December 2026 Online tax return deadline to have tax collected via PAYE Individuals
31 January 2027 Online Self Assessment deadline (2025/26 return) Individuals
31 January 2027 First Payment on Account for 2026/27 Self-employed
5 April 2027 End of 2026/27 Tax Year Everyone
Date Deadline / Event Who It Applies To
6 April 2026 Start of 2026/27 Tax Year Everyone
31 May 2026 P60s must be issued for 2025/26 Employers
6 July 2026 Deadline for P11D submission & Class 1A NIC reporting Employers
22 July 2026 Pay Class 1A NIC (19 July if by post) Employers
31 July 2026 Second Payment on Account (for 2025/26 tax bill) Self-employed / Higher earners
5 October 2026 Register for Self Assessment (if newly self-employed in 25/26) Self-employed / New taxpayers
31 October 2026 Paper Self Assessment return deadline Individuals
30 December 2026 Online tax return deadline to have tax collected via PAYE Individuals
31 January 2027 Online Self Assessment deadline (2025/26 return) Individuals
31 January 2027 First Payment on Account for 2026/27 Self-employed
5 April 2027 End of 2026/27 Tax Year Everyone
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