Seventeen Days to 19 September: Ireland Bi-Monthly VAT July–August
As of 2 September 2026, Irish bi-monthly VAT traders have seventeen days to file the July–August 2026 VAT 3 by 19 September — plus monthly, four-monthly, and annual VAT packs that share the same date.
Revenue’s Calendar of key dates for tax professionals lists 19 September 2026 for bi-monthly VAT 3 return and payment for July–August 2026, together with the Return of Trading Details where the VAT accounting period ends between 1 July and 31 August. As of Wednesday 2 September, bi-monthly traders have seventeen calendar days to close the twin-month pack.
The same 19 September date also carries monthly VAT 3 for August, four-monthly VAT 3 for May–August, and annual VAT 3 cycles ending in August. Do not assume “bi-monthly only” when your ROS profile still shows a monthly or annual obligation.
Who must diary 19 September
Bi-monthly VAT-registered traders covering July–August 2026, including Return of Trading Details where the VAT accounting period ends between 1 July and 31 August.
Monthly August VAT 3 filers, four-monthly May–August filers, and annual VAT 3 traders whose period ends in August — all share the 19th.
IOSS monthly returns remain a separate track (July IOSS cleared 31 August; August IOSS due 30 September) and do not replace domestic VAT 3.
Seventeen-day prep checklist
Reconcile July and August purchase and sales ledgers this week so VAT 3 boxes are not waiting on open bank matches into mid-September.
Confirm RTD requirements early — missing trading details can block a clean VAT 3 submission even when net VAT looks correct.
Diary September PAYE (14 September return; 23 September ROS payment) beside VAT so mid-month ROS sessions stay sequenced.
Keep December year-end CT1 (23 September) on a parallel track if you carry more than one registration.
How FinnAccountings helps with bi-monthly VAT packs
Organised sales and purchase channels make twin-month VAT packs easier to review. FinnAccountings helps Ireland and UK businesses prepare bookkeeping and VAT packs with Chartered Accountant insight before you or your Chartered Accountant (Ireland) or ICAEW/ACCA adviser files. Start a free trial for review-ready drafts — we prepare records; we do not file VAT 3 or ROS returns on your behalf.
Related reading
Yesterday’s eighteen-day bi-monthly briefing still maps the full September VAT cluster.
CT1 for December year-ends still has twenty-one days to 23 September.
For dual-market VAT estimates while you prep packs, use the free calculator.
Ireland-focused VAT 3 prep guidance sits on the VAT services guide.
Sources & references
This article draws on official guidance from the sources below.
- Calendar of key dates for tax professionals
Revenue (Irish Tax and Customs) · Accessed 2026-09-02 - When VAT becomes payable
Revenue (Irish Tax and Customs) · Accessed 2026-09-02 - How do you complete a VAT 3 return?
Revenue (Irish Tax and Customs) · Accessed 2026-09-02
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