VAT3 return
aka VAT3, Irish VAT return
The periodic VAT return filed with Revenue via ROS. Most Irish businesses file bi-monthly; small traders can apply for four-monthly or annual filing. An annual Return of Trading Details (RTD) accompanies the final period.
Last reviewed April 2026
Definition
The VAT3 is the periodic Value-Added Tax return filed with Revenue through ROS. The standard filing frequency is bi-monthly (six returns a year), but smaller businesses can apply to Revenue for four-monthly, biannual, or annual filing depending on turnover. The return captures four core figures: T1 (VAT on sales, output VAT), T2 (VAT on purchases, input VAT), T3 (VAT payable, calculated as T1 minus T2 when positive) and T4 (VAT repayable, when T2 exceeds T1). Additional lines cover intra-EU supplies (E1), intra-EU acquisitions (E2), postponed accounting on imports, and reverse-charge transactions. Each year the taxpayer also files an annual Return of Trading Details (RTD), which reconciles the full year's sales and purchases by VAT rate and validates the bi-monthly VAT3 totals. Payment is made at the same time as filing, via ROS Debit Instruction, SEPA Direct Debit, or online banking.
Why it matters for software choice
Accounting software that correctly classifies every transaction by Irish VAT rate (23%, 13.5%, 9%, 4.8%, 0%, exempt) and populates each VAT3 box automatically is the single biggest driver of return speed and accuracy. Software that only tracks a single generic VAT rate forces manual reclassification at filing time, which is the main source of errors and under-declarations.
Authority sources
- Revenue: Filing your VAT return (www.revenue.ie)
- Revenue: Return of Trading Details (RTD) (www.revenue.ie)
Software categories this affects
Vendors covered by this term
Xero
Cloud accounting with direct AIB, BOI, and PTSB bank feeds for Irish SMEs
Surf Accounts
100% Irish-built cloud accounting with Revenue compliance and Dublin-based support
Big Red Cloud
Irish cloud accounting for small businesses and sole traders
QuickBooks Online
Affordable cloud accounting with Irish bank feeds and a strong mobile app
Related terms
ROS (Revenue Online Service)
Revenue's secure portal for businesses, agents and large filers. Used to file VAT3, Form 11, CT1, RCT notifications, PAYE submissions and to access Revenue Payroll Notifications (RPNs).
Reverse Charge VAT (construction)
A VAT rule specific to Irish construction services: where both parties are RCT-registered, the subcontractor invoices net of VAT and the principal accounts for the VAT in their own VAT3 return.
Revenue eInvoicing
The mandatory structured electronic invoicing regime being rolled out by Revenue, aligning Ireland with the EU ViDA (VAT in the Digital Age) package. Invoices must be issued in a machine-readable format (UBL or CII) and transmitted via the Peppol network.