When is the corporation tax return due for my Irish company?
The corporation tax return (Form CT1) must be submitted to the Irish Revenue Commissioners within 9 months of the end of the financial year, but no later than the 23rd day of the ninth month.
Example:
- Financial year-end 31 December: Submission deadline is 23 September of the following year.
- Financial year-end 30 June: The deadline for submission is 23 March of the following year.
Last update on 17.08.2026 by Ronald Brozinsky.
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