What is ROS (Revenue Online Service)?

ROS (Revenue Online Service) is Ireland's secure online portal for business tax compliance, operated by Revenue Commissioners. Unlike myAccount (used by employees and private individuals), ROS is mandatory for all companies, employers, and self-employed people with annual income above €5,000. All corporate tax, VAT, PAYE, and self-assessment filings must go through ROS.

**Registering for ROS**

Registration happens in three stages at ros.ie: 1. Apply using your company tax reference number or TAIN (Tax Agent Identification Number), providing your email address and mobile number. 2. Revenue posts a one-time access code to the company's registered address — allow 3–5 working days. 3. Use the access code to create a ROS digital certificate, set a password, and download the certificate to your browser.

The ROS digital certificate is the key to every login. It is stored in your browser and must be backed up immediately by exporting it as a .p12 file. Losing the certificate without a backup means re-starting registration from scratch. When moving to a new computer, import the .p12 file before decommissioning the old machine.

**What is filed via ROS**

- Corporation Tax returns (Form CT1) — due 23rd of the ninth month after year-end - VAT returns — due 23rd of the month after each bi-monthly period closes - Employer PAYE/PRSI submissions and monthly P30 remittances — due 23rd of the following month - Form 11 self-assessment for self-employed individuals and directors with non-PAYE income - RCT (Relevant Contracts Tax) for principal contractors in construction and forestry - PSWT (Professional Services Withholding Tax) returns for government bodies - Dividend Withholding Tax (DWT) returns - Capital Gains Tax payments (31 January and 31 October installment dates)

**The ROS extended deadline — a practical benefit**

ROS users get extra time on most filing and payment deadlines. VAT returns and payments due by the 19th of the month extend to the 23rd for ROS filers. For income tax and CGT, the 31 October deadline extends to mid-November (typically 13–15 November, confirmed annually by Revenue). This extension only applies to electronic payments and submissions via ROS — paper filers must meet the earlier date. For companies, the CT1 deadline is the 23rd regardless, but Revenue routinely allows a small additional extension for online filers versus the 21st for paper.

**ROS vs myAccount**

myAccount is the equivalent portal for PAYE employees and private individuals — they use it to view payslips, claim reliefs, and manage tax credits. Directors of companies who also have PAYE employment income from another source may need both: ROS for corporate filings and Form 11, and myAccount to manage personal credits. Sole traders replace myAccount entirely with ROS once they register for self-assessment.

**Common problems and fixes**

- Certificate expiry: ROS certificates have a validity period. Revenue sends advance warning emails, but if the certificate lapses you will need to apply for a renewal certificate online. - Browser compatibility: ROS works most reliably in Chrome and Firefox. Safari on macOS requires specific certificate handling; Internet Explorer is no longer supported. - PAYE Modernisation (PMOD): since January 2019, all payroll submissions are real-time via ROS (Payroll Submission Request, or PSR, before each pay run). The old annual P35 return is abolished — PMOD replaced it with ongoing submissions. - Agent access: Accountants and tax agents access ROS under their own TAIN and manage multiple client accounts from a single login, without needing the client's certificate.