The General Anti-Avoidance Rule (GAAR) in Ireland: What Revenue Says

The general anti-avoidance rule, usually shortened to the GAAR, is the provision Revenue relies on to deny a tax advantage that comes from a transaction with little or no commercial purpose. For finance teams, company directors and advisers in Dublin and across Ireland, the practical questions are what the rule covers, what happens if Revenue applies it, and what a protective notification can and cannot do. This guide follows Revenue's own published material and is general information, not tax advice. For how a Revenue review or audit unfolds in practice, see our Revenue audit and compliance intervention guide.

What the GAAR is

According to Revenue's tax avoidance page (published 7 May 2026), the GAAR is set out in section 811C of the Taxes Consolidation Act 1997. Revenue describes it as aimed at transactions that have "little or no commercial purpose" and that are "primarily entered into to obtain a tax advantage". If a transaction falls within the rule, the person is not entitled to claim the tax advantage when submitting a return.

Revenue's Tax and Duty Manual Part 33-02-03, The General Anti Avoidance Rule and Protective Notifications (created April 2025), adds that ordinary tax planning that uses standard reliefs for bona fide commercial purposes is unlikely to be a tax avoidance transaction. The manual does not restate the full statutory definition of a tax avoidance transaction, so anyone analysing a specific arrangement should read the legislation itself and take advice.

Which taxes and which transactions

The manual says the GAAR applies to tax avoidance transactions in relation to:

• income tax, corporation tax and capital gains tax
• universal social charge (USC)
• value-added tax
• capital acquisitions tax
• stamp duties

It does not encompass PRSI, excise or customs duties. It applies to transactions that commenced after 23 October 2014; earlier transactions fall under sections 811 and 811A. If your question concerns excise or customs, the GAAR is not the relevant rule, and our guides on excise duty and customs cover those areas.

The objective test

Revenue's manual stresses that the test is objective. The question is what a reasonable person would reasonably consider on the facts. A taxpayer's personal belief that they were not avoiding tax is not enough on its own.

The manual also treats the GAAR as part of self-assessment. In Revenue's description, a taxpayer should identify any tax avoidance transaction and should not claim the resulting benefit on a return or claim.

What happens if the GAAR is applied

Under Revenue's manual, a person who takes a tax advantage from a tax avoidance transaction is liable for the additional tax, interest running from when the tax would otherwise have been due, and a tax avoidance surcharge. The manual states that the surcharge is 30% of the tax advantage, while Revenue's tax avoidance page says it "can be up to 30%". The two pages are worded differently, so check the current wording before relying on either figure.

Both pages are explicit that time limits do not protect a taxpayer who sought the advantage. Revenue says there is no time limit on enquiries, on withdrawing the tax advantage by amending an assessment, or on collecting the tax. The manual adds that where a transaction produces a loss, the surcharge arises only when relief for that loss is claimed and tax is underpaid or a refund over-claimed. The manual says the surcharge is determined and recovered in a similar way to a tax penalty, and that if the parties disagree the Courts decide. Revenue officers may also make an alternative assessment under another provision.

Protective notifications

A taxpayer who believes a transaction is not tax avoidance, but wants protection in case Revenue disagrees, can make a protective notification. Revenue's manual sets out the main features:

• Form PN1. A notification counts only if made on the prescribed form, fully completed with the transaction details, the relevant legislative provisions and why section 811C does not apply, plus supporting documents such as contracts.
• 90 days. The form must be received within 90 days of the date on which the transaction commences.
• Who can file. The taxpayer or an agent acting for them.
• Where. Forms are available on Revenue's website or through MyEnquiries on myAccount or ROS. The manual gives the postal address of Revenue's Protective Notification Unit in Dublin 2.
• Benefits of a valid notification. If the GAAR is later upheld, no tax avoidance surcharge applies, the taxpayer has one month after assessment before interest starts, and Revenue's time to investigate is limited to the standard period for that tax (four years for income tax, according to the manual).
• No inference. A notification is made without prejudice; nothing can be inferred from it about whether the transaction is tax avoidance, and Revenue will not express a view on its validity.
• Expressions of doubt. The manual says an expression of doubt is not a valid protective notification.

If Revenue forms the view that a valid notification was not made, the manual says Revenue may make enquiries and assessments outside the standard time frame, the tax is treated as due when it would otherwise have been due, and the surcharge may apply. The manual says a taxpayer who believes Revenue is barred from enquiring or assessing because of a valid notification may appeal to the Appeal Commissioners within 30 days of the enquiry or assessment notice. Our guide to the Tax Appeals Commission process explains how appeals against Revenue assessments work more generally.

Mandatory disclosure and the GAAR

Revenue's manual says protective notifications are generally not available where a transaction is disclosable under the Mandatory Disclosure Regime. In that situation the promoter, often the adviser, usually supplies a Transaction Number that must appear on the tax return, and receiving a Transaction Number before the return filing date invalidates an earlier protective notification. There is a narrow route called a Taxpayer Initiated Disclosure, using Form MD7, where the promoter has not complied. Our guide to the mandatory disclosure regime covers the reporting side for intermediaries. The manual also refers readers who want to make a qualifying avoidance disclosure to section 811D and Chapter 7 of Revenue's Code of Practice for Revenue Compliance Interventions; this guide does not cover that process.

How the GAAR fits with a Revenue intervention

The GAAR is not a separate type of audit. It is a rule Revenue can apply when it examines a return or a claim. Because Revenue says there is no time limit where an advantage was sought, the quality of your records matters. The audit guide linked at the start of this article covers how Revenue reviews, audits and investigations proceed.

A practical approach for finance teams

The following points are our suggestions, not Revenue requirements or legal advice.

• Our suggestion: record the commercial reasons for a significant transaction at the time it is entered into, including who approved it and what alternatives were considered.
• Our suggestion: diarise the 90-day window from the date a transaction commences whenever a protective notification might be considered, and decide early who will file it.
• Our suggestion: check whether the arrangement could also be reportable under the mandatory disclosure rules before deciding on a protective notification.
• Our suggestion: where a structure was proposed mainly by a promoter or adviser, keep their written advice with the transaction file.
• Our suggestion: take advice from a qualified tax adviser on any transaction where the tax result is the main attraction.

Learnsignal's offices are off Baggot Street in Dublin, and we offer in-person training from there. For current details, see our CPD pages.

Frequently asked questions

Does the GAAR apply to PRSI or excise?

According to Revenue's Tax and Duty Manual Part 33-02-03, the GAAR does not encompass PRSI, excise or customs duties. It covers taxes such as income tax, corporation tax, capital gains tax, USC, VAT, capital acquisitions tax and stamp duties.

Is normal tax planning caught by the GAAR?

Revenue's manual says ordinary tax planning that uses standard reliefs for bona fide commercial purposes is unlikely to be a tax avoidance transaction. The test is objective and depends on the facts, so it is not safe to assume any particular arrangement is outside the rule.

Can Revenue look back indefinitely?

Revenue states there is no time limit on enquiries, on withdrawing the tax advantage or on collecting the tax where a tax avoidance transaction was entered into and the advantage sought. A valid protective notification limits Revenue to the standard period for the tax concerned.

Does Revenue tell you whether a protective notification is valid?

No. The manual says Revenue will endeavour to acknowledge receipt promptly, but the acknowledgement carries no view on validity, and Revenue will not express an opinion on whether a notification is valid or whether a transaction is tax avoidance.

Where should I check the current rules?

Time limits, forms and percentages can change. Check Revenue's tax avoidance page and Tax and Duty Manual Part 33-02-03 on the day, and read section 811C and section 811D of the Taxes Consolidation Act 1997 for the statutory wording.

Revenue's guidance is the best starting point, and a qualified tax adviser should review any transaction where the GAAR could be in play.