18 May 2026
- Mandatory Tax Advisor Registration (TAR)
introduced, enforcing a new mandatory
registration regime for tax advisers who, as
part of their business, interact with HMRC on
behalf of their clients
22 May 2026
– Deadline for electronic remittance of PAYE,
NICs and CIS to HMRC.
31 May 2026
– P60s to be given to all employees.
31 May 2026
– Deadline for filing of accounts with Companies
House for accounting periods ended 30 August
2025.
31 May 2026
– Corporation Tax returns due for accounting
periods ended 31 May 2025.
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