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Irish Tax Calendar 2027

A practical deadline view for common Irish tax scenarios. Dates may vary by circumstance and filing method, so confirm in Revenue guidance before filing.

2026 2027 2028

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Tax Deadline Tax Calendar Pay and File Preliminary Tax Balance of Tax Form 11 ROS (Revenue Online Service)myAccount (Revenue)CGT Payment

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Local Property Tax: Common Single Payment Deadline

10 Jan 2027221days leftEstimated date

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Date	Event	Days
10 Jan 2027	Local Property Tax: Common Single Payment Deadline Common timing for single LPT payments (varies by year and payment method).	221
31 Oct 2027	Income Tax: Preliminary Tax Payment Preliminary tax payment deadline for self-assessed taxpayers.	515
31 Oct 2027	Income Tax: Form 11 Paper Filing Deadline Paper filing deadline for Form 11.	515
15 Nov 2027	Income Tax: ROS Online Filing & Payment Extension (Typical) Typical extension window for ROS filers.	530
15 Dec 2027	Capital Gains Tax: Payment Deadline (Disposals Jan–Nov) Pay CGT for disposals made between 1 January and 30 November.	560
31 Dec 2027	Investments: Deemed Disposal (8-Year Cycle) Common cut-off used for deemed disposal reporting.	576

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Year 2027

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Full calendar

Some deadlines for December activity can fall in January of the following year. Use the date shown on each line item.

January 2027

Local Property Tax: Common Single Payment Deadline

Common timing for single LPT payments (varies by year and payment method).

10 Jan 2027Estimated

Details

Local Property Tax (LPT) deadlines can vary depending on the year and how you choose to pay. Confirm the current year's options in Revenue guidance.

Official guidance

October 2027

Income Tax: Preliminary Tax Payment

Preliminary tax payment deadline for self-assessed taxpayers.

31 Oct 2027

Details

Pay preliminary tax for the 2027 tax year if you are within self-assessment. This commonly applies to self-employed individuals and landlords.

Official guidance

Income Tax: Form 11 Paper Filing Deadline

Paper filing deadline for Form 11.

31 Oct 2027

Details

File the paper Form 11 for the 2026 tax year if you are using paper filing. Many taxpayers file through ROS instead.

Official guidance

November 2027

Income Tax: ROS Online Filing & Payment Extension (Typical)

Typical extension window for ROS filers.

15 Nov 2027Estimated

Details

If you file and pay through ROS (Revenue Online Service), an extension is typically available beyond 31 October. The exact date can vary year to year.

Official guidance

December 2027

Capital Gains Tax: Payment Deadline (Disposals Jan–Nov)

Pay CGT for disposals made between 1 January and 30 November.

15 Dec 2027

Details

Pay Capital Gains Tax on chargeable disposals made between 1 January and 30 November 2027.

Official guidance

Investments: Deemed Disposal (8-Year Cycle)

Common cut-off used for deemed disposal reporting.

31 Dec 2027

Details

For Irish ETF / fund taxation, a deemed disposal event can apply at the end of an 8-year period. Your exact position depends on purchase dates and the product.

Official guidance

Income Tax: 4-Year Refund Claim Limit (2023)

Last date to submit certain claims for the tax year 2023.

31 Dec 2027

Details

Revenue generally does not accept claims outside the 4-year time limit. Check the specific claim type and your circumstances.

Official guidance

January 2028

Capital Gains Tax: Payment Deadline (Disposals in December)

Pay CGT for disposals made in December.

31 Jan 2028

Details

Pay Capital Gains Tax on chargeable disposals made in December 2027. This deadline falls in January of the following year.

Official guidance

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How to interpret these dates

Rules and common edge cases

ROS extension

An extension is typically available if you both file and pay through ROS. The exact date can vary, so treat it as an estimate until Revenue confirms the current year.

Interest and penalties

Missing a deadline may lead to interest or penalties depending on the return type and your circumstances. If you are unsure, check Revenue guidance or your advisor.

4-year claim limit

Revenue generally applies a 4-year limit for certain claims. Ensure the claim type you are making is within the time limit and keep supporting documentation.

How to interpret these dates

ROS extension

An extension is typically available if you both file and pay through ROS. The exact date can vary, so treat it as an estimate until Revenue confirms the current year.

Interest and penalties

Missing a deadline may lead to interest or penalties depending on the return type and your circumstances. If you are unsure, check Revenue guidance or your advisor.

4-year claim limit

Revenue generally applies a 4-year limit for certain claims. Ensure the claim type you are making is within the time limit and keep supporting documentation.