Tax Deadline Calendar

Next 24 months of UK tax deadlines, with calendar and CSV export.

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Compliance note: Professional-use tool only. Deadlines are working prompts for adviser review, not filing advice. Verify dates against HMRC, Companies House, FCA and professional-body requirements for the specific client before relying on them.

Select Deadline Set

Companies House accounts due

High

Private company accounts filing deadline for period ended 31 March 2026.

Deadline:31 December 2026
Type:Companies House
Note:Assumes standard private company filing deadline.

Corporation Tax payment due

Critical

Corporation Tax payment deadline for accounting period ended 31 March 2026.

Deadline:1 January 2027
Type:Corporation Tax
Note:Normally 9 months and 1 day after the accounting period end.

Corporation Tax return due

Critical

Company Tax Return deadline for accounting period ended 31 March 2026.

Deadline:31 March 2027
Type:Corporation Tax
Note:Normally 12 months after the accounting period end.

Companies House accounts due

High

Private company accounts filing deadline for period ended 31 March 2027.

Deadline:31 December 2027
Type:Companies House
Note:Assumes standard private company filing deadline.

Corporation Tax payment due

Critical

Corporation Tax payment deadline for accounting period ended 31 March 2027.

Deadline:1 January 2028
Type:Corporation Tax
Note:Normally 9 months and 1 day after the accounting period end.

Corporation Tax return due

Critical

Company Tax Return deadline for accounting period ended 31 March 2027.

Deadline:31 March 2028
Type:Corporation Tax
Note:Normally 12 months after the accounting period end.

Tip: Calendar exports include a 7-day reminder. Dates are common UK deadlines and should be reviewed against the client's filing status, accounting period, and payment method.