Twenty-Seven Days to 30 September: Ireland August VAT IOSS
As of 3 September 2026, Irish IOSS registrants have twenty-seven days to file and pay the August 2026 Import One Stop Shop VAT return by 30 September — keep the monthly track separate from domestic VAT 3 due 19 September.
Revenue’s Calendar of key dates for tax professionals lists 30 September 2026 for the VAT IOSS monthly return and payment for August 2026. As of Thursday 3 September, Irish Import One Stop Shop (IOSS) registrants and intermediaries have twenty-seven calendar days to the August return date.
IOSS lets suppliers account for EU VAT on low-value imported consignments (intrinsic value not exceeding €150) through a monthly return to the Member State of identification instead of paying import VAT to Customs at the border. Revenue’s IOSS Tax and Duty Manual confirms the return must be filed electronically by the end of the month following the tax period, whether or not any supplies were made.
Who must diary 30 September
IOSS-registered suppliers identified in Ireland, and intermediaries acting for non-EU suppliers, must file the August 2026 monthly return and pay any VAT due by 30 September 2026.
Nil returns are mandatory when you made no IOSS supplies in the period. Missing a nil return can still trigger reminders and compliance contact — treat blank months as filing events, not quiet months.
IOSS does not replace your domestic VAT 3 obligations. Traders with both Irish VAT and IOSS registrations keep both diaries separate into the 19 September bi-monthly window and the 30 September IOSS cut-off.
Twenty-seven-day IOSS checklist
Reconcile August low-value consignments and marketplace reports to your IOSS ledger while July close-out is still fresh — do not leave first bank payment attempts for late September when ROS and banking queues build.
Confirm ROS or MyEnquiries access for the IOSS return path before mid-month leave thins coverage.
If you use an intermediary, confirm who files and who pays before the final week — split responsibility is the most common final-day failure mode.
Keep September PAYE (14 September), bi-monthly VAT (19 September), and CT1/RCT (23 September) on a separate domestic ROS calendar so August IOSS does not collide with mid-month cash days.
How FinnAccountings helps with IOSS and domestic VAT packs
Organised sales channels make IOSS and VAT 3 packs easier to review side by side. 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 IOSS or ROS returns on your behalf.
Related reading
Monday’s twenty-nine-day August IOSS briefing still maps scheme context and nil-return rules.
September week-two ROS prep still maps PAYE, VAT, and CT1.
Bi-monthly July–August domestic VAT filers should keep 19 September on the radar.
For dual-market VAT estimates while you prep packs, use the free calculator.
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 2026-09-03 - Import One Stop Shop (IOSS) — Tax and Duty Manual
Revenue (Irish Tax and Customs) · Accessed 2026-09-03 - When VAT becomes payable
Revenue (Irish Tax and Customs) · Accessed 2026-09-03
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