IE·Tax year 2025 · Filing 2026

Ireland tax deadlines 2026.

Every individual and self-employed income tax deadline for Ireland in 2026. Plus recurring VAT / GST / sales tax filings. Each deadline links to notes on how to file, what people miss, and matching open-source tax skills.

Ireland tax authority

Annual deadlines

1 this year

Nov15

Self-Assessment ROS Extended Deadline

The extended Revenue Online Service (ROS) deadline for Form 11 income tax returns, preliminary tax 2026, and balancing payment for 2025. Usually mid-November; confirm the exact date with Revenue each year.

IrelandSelf-employed

Recurring filings

VAT / GST / Sales tax

VAT 3 Return

Ireland

Quarterly

Irish VAT 3 return, typically bi-monthly for most traders but quarterly or annual options exist for smaller businesses.

Open-source skills for Ireland

Prepare this return with open-source skills

These skills are in the OpenAccountants repo. Clone them into Claude, Cursor, or any AI agent and they handle the computation.

ireland-vat-return.mdIE

Use this skill whenever asked to prepare, review, or classify transactions for an Irish VAT return (VAT3 form) for a self-employed individual or small business in Ireland. Trigger on phrases like "prepare VAT return", "do the VAT", "Irish VAT", "VAT3", "ROS return", "Revenue Online", or any request involving Ireland VAT filing. Also trigger when classifying transactions for VAT purposes from bank statements, invoices, or other source data. This skill covers Ireland only and only standard VAT-registered businesses. VAT groups, Capital Goods Scheme adjustments, and complex property transactions are in the refusal catalogue. MUST be loaded alongside BOTH vat-workflow-base v0.1 or later AND eu-vat-directive v0.1 or later. ALWAYS read this skill before touching any Irish VAT work.

Preparing a Ireland return?

The OpenAccountants repo has verified, open-source tax computation skills. Clone and run them with your AI agent, then get an accountant to review.

View the repo All countries