Ireland Compliance Calendar | VAT · CT · PAYE · CRO | PJRJ

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Corporation taxCT1
Corporation tax pay & file (calendar year)
CT1 · AP ending 31 DecAnnual
Preliminary tax and CT1 pay-and-file for a calendar-year AP commonly fall around 23 September.
Why this date Taxes Consolidation Act — corporation tax return and balancing payment are generally due 9 months after the end of the accounting period (ROS often 23rd of that month).
Preliminary tax rules and large-company instalments can add earlier payment dates.
Related desk / guide
VATVAT3
VAT return (bi-monthly)
Jul–Aug VAT periodBi-monthly
Bi-monthly VAT3 returns are commonly due on the 19th (paper) or 23rd (ROS) of the month after the period. Shown on the 23rd for Jan/Mar/May/Jul/Sep/Nov periods ending even months.
Why this date VAT Consolidation Act / Revenue practice — bi-monthly VAT returns fall in the month following the two-month period.
Monthly, four-monthly, and annual filers have different calendars — confirm on ROS.
Related desk / guide

How dates are calculated

4 Ireland rules drive the grids. Confirm Revenue ROS and CRO before filing.

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