| Date | Tax Type | Return/Payment Period | Notes |
| 1-25 | CRO | Annual Return filing deadline with ARD between 01 July 2025 and 31 July 2025. | Accounting year end typically 31 October 2024 but may be different. |
| 14 | PAYE/PRSI/USC/LPT | Monthly return and payment for August 2025 | Payment date extended to 23rd for ROS users who file and pay online |
| 14 | Dividend Withholding Tax (DWT) | Return and payment of DWT for August 2025 | |
| 14 | Professional Services Withholding Tax (PSWT) | F30 monthly return and payment for August 2025 | |
| 19 | VAT | Monthly VAT 3 return and payment (if due) for August | Return of Trading Details where VAT accounting period ends in August |
| 19 | VAT | Bi-Monthly VAT 3 return and payment (if due) for July – August 2025 | Return of Trading Details where VAT accounting period ends between 1 July and 31 August |
| 19 | VAT | 4 Monthly VAT 3 return and payment (if due) for May – August 2025 | Return of Trading Details where VAT accounting period ends between 1 May and 31 August |
| 19 | VAT | Annual VAT 3 return and payment (if due) for September – August | Return of Trading Details where VAT accounting period ends in August |
| 01-23[1] | Corporation Tax | Preliminary Tax for APs ending between 1-31 October 2025 | |
| 01-23[1] | Corporation Tax | 1st Installment Preliminary Tax for APs ending between 1-28 February 2026 | Large CT Liabilities > €200,000 in prior year. |
| 01-23[1] | Corporation Tax | Returns for APs ending between 1-31 December 2024 | |
| 01-23[1] | Corporation Tax | Pay balance due on APs ending between 1-31 December 2024 | |
| 23 | Relevant Contracts Tax (RCT) | RCT monthly return and payment (if due) for August 2025 | |
| 01-30 | Corporation Tax | Returns of Third Party Information for APs ending between 1-31 December 2024 | |
| 30 | VAT | IOSS Monthly Return and payment due for August 2025 | |
| Pay date | RCT | Subcontractor Payments must be filed on or before every pay date. | |
| Pay date | PAYROLL | Payroll Submission (PSRs): Must be filed on or before every pay date. | |
| [1] | Where the return and payments are not received electronically, the return and payments filing date is 1-21 of the relevant month. | ||
The vast majority of companies registered in Ireland have a financial year end of 31 December and as such will likely have an annual return date of 30 September. Historically this time of year has been the busiest for the Companies Registration Office (CRO), sometimes referred to as “annual compliance season”. If your company has an annual return date of 30 September 2024, the annual return and financial statements must be filed no later than 25 November 2024. But bear in mind corporation tax compliance deadlines also fall before the 23rd September 2025.