The VAT3 Return in Ireland: Deadlines, Boxes and ROS (2026)

Registering for VAT in Ireland gets you a number, and a rhythm. Every two months, Revenue expects a VAT3 return: a short form with outsized consequences if it’s late, wrong, or built on messy records.

This guide completes our Irish VAT series: after the rates and the registration thresholds, here’s the filing itself: periods, deadlines, what goes in each box, the annual RTD everyone forgets, and what changed in 2026.

The Rhythm: Bi-Monthly by Default

Ireland’s standard VAT periods are two months long, six per year:

The deadline is the 23rd of the month following the period when you file and pay through ROS (Revenue Online Service). The old 19th deadline belonged to paper filing, and that distinction is now history: since 1 April 2026, eFiling through ROS is mandatory for all VAT-registered businesses.

Smaller traders can be authorised for less frequent returns (four-monthly, six-monthly or annual, depending on VAT liability), and businesses in a constant repayment position can apply for monthly returns to speed refunds up.

What Goes in the VAT3

The form itself is disarmingly short:

• T1 (VAT on sales): output VAT you charged in the period at 23%, 13.5% or 9% (the full rate map here)
• T2 (VAT on purchases): input VAT you’re reclaiming (valid VAT invoices only)
• T3 / T4 (the result): T1 − T2. Positive → T3, payable; negative → T4, repayable
• E1 / E2: intra-EU supplies and acquisitions of goods
• ES1 / ES2: intra-EU supplies and acquisitions of services
• PA1: postponed accounting on imports. If you import from outside the EU (including Great Britain), the import VAT is self-accounted here instead of paid at the border

Nil period? File anyway. A VAT3 with zeros is still a VAT3; skipping it flags you in Revenue’s systems faster than almost anything else.

The One Everyone Forgets: the Annual RTD

Once a year, ROS prompts you for the Return of Trading Details: a summary of all sales and purchases for the year, broken down by VAT rate. It’s statistical (no payment attaches), but:

• It’s mandatory, and an outstanding RTD blocks tax clearance certificates and can hold up refunds
• Revenue cross-checks it against your six VAT3s: if the RTD says one thing and the returns another, expect questions

If your bookkeeping tags every transaction with its VAT rate as it happens, the RTD assembles itself. If not, January archaeology.

Late Filing and Payment

Miss the 23rd and the consequences stack: interest on unpaid VAT accrues daily (at roughly 0.0274% per day, about 10% a year), Revenue can estimate your liability and pursue the estimate, and persistent lateness invites an audit and can block tax clearance. Filing on time with a payment arrangement always beats not filing.

Common VAT3 Mistakes

1. Reclaiming input VAT without a proper VAT invoice: a card slip isn’t one
2. Claiming blocked input VAT: passenger cars (in most cases), petrol, food, drink and entertainment are non-deductible even when business-related
3. Missing PA1 postponed accounting on GB/non-EU imports, or booking it in T1/T2 but forgetting the E/PA statistical boxes
4. Mixing up zero-rated and exempt: zero-rated sales preserve your input VAT deduction; exempt sales don’t, and enough of them triggers partial recovery calculations
5. Rate errors after 1 July 2026: restaurant and catering food and hairdressing moved to 9%; hotel rooms didn’t. Mixed bills need line-level rates
6. Treating the RTD as optional (see above)

How Odiverse Helps

A VAT3 is only ever a summary of your bookkeeping, so the fix for painful VAT3s is bookkeeping that files itself forward. Odiverse applies the correct Irish VAT rate per line at invoice time (including the July 2026 changes, by supply date), reads supplier invoices with OCR and books them with the input VAT split out, and keeps running rate-by-rate totals, so T1, T2 and the year-end RTD are reports of what already happened. Irish return e-filing and Peppol e-invoicing are on our roadmap; the invoicing, accounting (FRS 102 chart) and multi-rate engine work today.

Frequently Asked Questions

When is the VAT3 return due in Ireland? By the 23rd of the month after the two-month period ends, filed and paid through ROS. Example: the May–June period is due 23 July.

Do I file a VAT3 if I had no sales? Yes. Nil returns are mandatory for every period you’re registered, even with zero activity.

What is the RTD in Irish VAT? The annual Return of Trading Details: a statistical summary of the year’s sales and purchases by VAT rate. No payment attaches, but it’s mandatory and Revenue reconciles it against your VAT3s.

Can I file Irish VAT returns on paper in 2026? No. Since 1 April 2026, electronic filing through ROS is mandatory for all VAT-registered businesses.

How do I get VAT refunds faster in Ireland? If you’re consistently in a repayment position (typical for exporters), apply to file monthly instead of bi-monthly.

Six Returns a Year, Zero Drama

Bi-monthly periods, the 23rd on ROS, one RTD in January. If you’d rather the numbers accumulated themselves between deadlines, try Odiverse free, or start with how it works for Irish freelancers.