Irish company tax substance requirements (US and UK)

Ireland has no single substance law for companies. Although an Irish company is generally tax resident in Ireland from incorporation, the practical value of that residence often depends on the company's level of substance and where key decisions are made. Revenue looks at it to decide whether profits qualify for the 12.5% trading rate or are taxed at 25%. HMRC and the IRS look at the same facts to decide whether the UK can claim the company as its own, or whether US tax rules reach its profits anyway.

For a founder in the US or the UK, the practical test is whether you can show where the company is run and who runs it. We set up and administer Irish companies for overseas owners, and substance is the part of that work that decides whether the structure holds when Revenue, HMRC or the IRS asks questions.

Does Ireland have a substance law for companies?

No. Jurisdictions such as Jersey and the Cayman Islands have economic substance laws with fixed tests and annual reporting. Ireland has never had one. The EU proposed a shared set of substance tests in the Unshell Directive, often called ATAD 3, but Member States stopped work on it in June 2025 and the Commission has said it will withdraw the proposal.

Substance is still tested, but inside four sets of rules that apply to every company with foreign owners.

Rule	The question it asks	Who applies it
Company residence and tax treaties	Where is the company resident, and does a treaty move that residence to another country?	Revenue, and the other country's tax authority
The 12.5% trading rate	Is the company actually carrying on a trade in Ireland?	Revenue
Permanent establishment rules	Does the company have a taxable presence in the country where its people work?	HMRC or the IRS
Controlled foreign company rules	Does the owner's country tax the company's profits in the owner's hands?	HMRC or the IRS

 

The first two are Irish rules. The second two belong to your home country, and in our experience they are where structures owned from the US or UK come under the most pressure.

Is an Irish-incorporated company automatically tax resident in Ireland?

Yes, with one exception. Under section 23A of the Taxes Consolidation Act 1997, a company incorporated in Ireland is resident in Ireland for tax purposes. Revenue's company residency rules say this applies to every company incorporated on or after 1 January 2015, and the transition period for older companies ended on 31 December 2020. The exception is a company that a double taxation agreement treats as resident in the other country. Where that happens, Ireland treats the company as non-resident as well.

Central management and control still matters, for two reasons. It is the test Ireland applies to companies incorporated abroad, and it is the test other countries, the UK included, apply to an Irish company. Revenue's manual on company residence lists the factors the courts weigh: where company policy is decided, where the majority of directors live, where major contracts are negotiated, where the board meets and where the head office is. The test is aimed at the highest level of control, such as policy, major investments and major contracts, and not at day-to-day transactions.

So an Irish company does not need board meetings in Dublin to be Irish resident under Irish law. It needs real decision-making in Ireland so that no other country can make a competing claim to it. Our guide to the Irish private limited company explains why a director's residence and the company's residence are separate questions.

What substance does the 12.5% corporation tax rate need?

The 12.5% rate applies to trading income. Revenue's page on the basis of charge sets the 25% rate for non-trading income, such as rental and investment income, and for income from excepted trades, such as dealing in land. Being an Irish resident does not determine which rate applies. The rate depends on whether the company is actively trading.

Revenue's guidance on trading income subject to the 12.5% rate starts from the principle that trading presupposes activity, and that the activity will require "people with the skill and authority necessary to carry them out". Outsourcing does not on its own prevent a company from trading, but the company has to show how it manages and controls the outsourced work. A company that simply owns an asset and collects the income it produces is treated as an investor, and routine invoicing or bookkeeping does not change that.

For complex cases and new inward investment, Revenue will consider a request for an advance opinion on whether an activity is a trade. The request has to describe the management functions, the number and skills of the people involved and their level of authority. Most small companies will never need one, but the list is a useful guide to what Revenue considers relevant.

Before we incorporate a company for an overseas founder, we map which decisions will be made in Ireland and by whom. That answer drives the tax rate as much as it drives residence.

What counts as substance in practice?

Irish law does not set a minimum. Revenue and the courts look at the facts, and substance should be in proportion to the business. A two-person distribution company has no need for a floor of offices in Dublin. It does need its Irish director to be the person who actually makes the decisions they sign.

The registered office deserves a specific mention, because it is often mistaken for presence. Every Irish company must have one, and it is the address where official correspondence is served. Our guide to registered offices in Ireland covers what it must provide. It doesn't show that business is carried on there.

This is the part of the structure we provide for clients. We supply Irish-resident directors who take part in board decisions, host and minute board meetings in Ireland, and act as company secretary, so the records match what actually happens.

How do UK founders stop HMRC treating their Irish company as UK resident?

The UK applies the central management and control test to companies incorporated abroad. HMRC's International Manual at INTM120060 explains that the test looks for the highest level of control, and that this may be exercised by the board or by someone else, such as a parent company. In Bullock v Unit Construction, the subsidiaries' boards met outside the UK, yet the companies were held to be UK resident because their parent's board in London took the real decisions. A board meeting in Dublin carries little weight if the decisions were made in London beforehand.

If HMRC treats your Irish company as UK resident, the company is resident in both countries. The Ireland–UK double taxation convention used to settle that by reference to the place of effective management. That rule has been replaced by Article 4 of the OECD Multilateral Instrument, as shown in Revenue's synthesised text of the Ireland–UK convention. Revenue and HMRC must now try to agree where the company is resident, considering its place of effective management, where it was incorporated and any other relevant factors. Until they agree, the company cannot claim relief or exemption under the treaty, except to the extent the two authorities allow.

Does a UK-resident director count towards Ireland's director requirement?

No. Section 137 of the Companies Act 2014 requires at least one EEA-resident director, and a UK-resident director has not counted since 1 January 2021. Without one, the company needs a Section 137 bond. The bond satisfies company law, but it adds nothing to the company's substance.

Can a UK-based director create a UK permanent establishment?

Yes. Under Article 5 of the convention, an Irish company can have a UK permanent establishment through a fixed place of business in the UK, or through a person in the UK who habitually exercises authority to conclude contracts in its name. A founder who signs the company's customer contracts from a home office in Leeds can create one, and the profits attributable to it are then taxable in the UK.

Do the UK controlled foreign company rules apply to an Irish subsidiary?

They can. Where a UK company owns the Irish company, the UK's CFC rules can tax the Irish profits in the parent's hands. The tax exemption at INTM226100 applies only where the local tax is at least 75% of the corresponding UK tax. Irish tax at 12.5% is half of the UK main rate of 25%, so an Irish trading company cannot use that exemption. It has to rely on one of the other exemptions, or show that its profits do not pass through the CFC charge gateway, and both routes depend on where the people who manage the company's assets and risks are based.

If you own the Irish company personally rather than through a UK company, different UK anti-avoidance rules apply, and your UK adviser should review them before you incorporate. Our comparison of setting up in Ireland or the UK covers the wider choice between the two.

We advise on Irish corporation tax and residence for UK-owned companies, and we place the Irish-resident director and board process that keeps central management and control in Ireland.

What does the US side look at when a US founder owns an Irish company?

A corporation's US status depends on where it is incorporated, so an Irish company does not become a US company because its directors live in New York. The US questions arise elsewhere, and most of them turn on the same facts as the Irish substance test.

Can the US tax an Irish company that is run from the US?

It can tax part of its profits. If the company's selling, contracting and management are carried on by people in the US, it may be engaged in a US trade or business, and under the US–Ireland tax treaty the US can tax profits attributable to a permanent establishment there.

How do the US controlled foreign corporation rules apply?

An Irish company more than 50% owned by US shareholders, each holding at least 10%, is a controlled foreign corporation. Its US shareholders can be taxed currently on Subpart F income and on net CFC tested income (NCTI), the regime formerly called GILTI, which the One Big Beautiful Bill Act renamed and amended for tax years beginning after 31 December 2025. Irish tax at 12.5% will not always remove the US charge. How much remains depends largely on whether the US shareholder is a corporation or an individual, and that calculation belongs with your US tax adviser before you choose a structure.

What do US owners and directors have to file?

US persons who are officers, directors or shareholders of certain foreign corporations file Form 5471. A US director who is a signatory on the Irish company's bank account may also need to file an FBAR, which our guide to opening an Irish business bank account covers.

Should an Irish company check the box for US tax?

That is a US decision with no effect in Ireland. Under the US entity classification rules at 26 CFR 301.7701-2, an Irish public limited company is always treated as a corporation, while a private company limited by shares is an eligible entity that can elect a different US classification on Form 8832. Whatever it elects, Ireland still taxes the company as a company.

A US-only board also needs an EEA-resident director or a Section 137 bond, exactly as a UK board does. We handle the Irish side of the structure and work alongside your US adviser, so the facts that support Irish trading status are the same facts your US filings describe. If you are relocating as well as incorporating, read our guide to moving to Ireland from the US.

How does substance affect tax registration, VAT and banking?

Substance is established in the first weeks of a company's life, long before any tax audit.

Revenue's eRegistration service is not available to companies that have no Irish-resident directors. Those companies register for corporation tax, VAT and payroll taxes on a paper TR2 form instead, which is slower, and any query Revenue raises goes to whoever the form names as the contact.

VAT registration is where Revenue scrutinises the most as to whether the business is real. For Intra-EU VAT status, Revenue asks about the customers you will supply, the due diligence you carry out on EU suppliers and your expected turnover, and applications with thin evidence get queried. Our guide on how to register for VAT in Ireland sets out what Revenue asks for, and our VAT registration service prepares that evidence with you.

Banks ask similar questions under anti-money laundering rules, and some have their own residency rules for directors. Revolut Business, for example, needs at least one director or beneficial owner living in the EEA or Switzerland.

Substance can also remove the director requirement entirely. Under section 140 of the Companies Act 2014, the Registrar can certify that a company has a real and continuous link with economic activity in Ireland, on the strength of a written statement from Revenue. A company with that certificate needs neither an EEA-resident director nor a Section 137 bond. A newly formed company rarely qualifies, because the activity has to exist already.

How Nathan Trust sets up substance for US and UK founders

Most of the substance questions above are settled by decisions made before incorporation: who sits on the board, where they live, where the board meets and who signs contracts. We set those up with you at the start, so that the company's first filings already describe a business run from Ireland.

Our Irish company formation service for non-residents takes care of incorporation and tax registration, and arranges the Section 137 bond where you need one. Alongside it we provide:

• an Irish-resident director who takes part in board decisions
• a registered office and company secretary
• board meetings held and minuted in Ireland
• corporation tax advice on residence, trading status and transfer pricing between the Irish company and its owners

If you are planning an Irish company from the US or the UK, tell us how your business will run and we will show you what substance it needs and what it will cost.

Frequently asked questions

Does a nominee director give an Irish company substance?

Not by being appointed. A director who only signs documents prepared elsewhere satisfies section 137 of the Companies Act but adds little to the company's substance. What counts is an Irish-resident director who understands the business, receives board papers in advance and takes part in the decisions recorded in the minutes.

Is a registered office address enough to show substance?

No. A registered office is a legal requirement and the address for official correspondence. It does not show that the company carries on business there.

How many board meetings have to be held in Ireland?

Irish law sets no number. What matters is that the decisions amounting to central management and control are taken at meetings held in Ireland. Those are the decisions on strategy, budgets, major contracts and investments. A board that meets in Ireland once a year while real decisions are made elsewhere is exposed, however well the minutes are written.

Can directors join Irish board meetings by video from the UK or US?

They can, but it carries risk. HMRC looks at where decisions are actually made, and directors taking part from the UK can count towards UK central management and control. Where possible, hold meetings in Ireland with the chair and a majority of directors physically present, and keep a record of where each director attended from.

Can an Irish company with no employees qualify for the 12.5% rate?

It can, if the trade is genuinely carried on and managed in Ireland, for example by directors who run it from here, or through outsourced work that the company manages and controls. Revenue's test is activity carried out by people with the skill and authority to do it, not headcount alone.

Does a Section 137 bond prove substance?

No. The bond is insurance that lets the company register without an EEA-resident director. It satisfies company law and says nothing about where the company is managed or whether it trades.