Running a Northern Ireland company from your home in the Republic and the residence risk it creates

A company incorporated in Northern Ireland is always UK tax resident, because UK law treats every UK-incorporated company as resident here. Ireland applies a different test. A company is Irish tax resident if its central management and control is in Ireland, wherever it was incorporated. So if you live in the Republic and make the company’s key decisions from there, your NI company can be tax resident in both countries at once.

For companies in that position, the UK–Ireland double tax treaty no longer settles the question automatically. Since the OECD multilateral instrument took effect, the tax authorities of both countries decide residence by mutual agreement. Until they agree, treaty relief may not be available.

You can reduce the risk in 3 main ways:

• Keep strategic decision-making genuinely in Northern Ireland
• Change the structure so the company’s residence matches where it is really run
• Seek agreement from both tax authorities through the mutual agreement procedure

Separately, check whether your home office creates a taxable presence in Ireland even if residence stays in the UK.

That’s the summary. The rest of this guide explains how each country decides residence, why the treaty change matters, and the practical steps that keep a cross-border owner-managed company on the right side of both systems.

How the UK and Ireland decide where a company is resident

Both countries look at incorporation and at where a company is really run, but they apply the tests differently. That difference is what creates the problem for NI companies with directors living south of the border.

Ireland tightened its own rules from 2015, so that companies incorporated in Ireland are generally Irish resident. The central management and control test still applies to companies incorporated elsewhere, including companies registered in Northern Ireland.

What is central management and control?

Central management and control is where the highest level of decision-making happens. Think strategy, major contracts, financing, acquisitions, dividends and appointing senior people, not day-to-day operations. It’s usually exercised by the board, so where the directors actually meet and decide matters more than where the company is registered or where staff work.

Revenue’s guidance on company residency rules lists the kind of questions it asks. Where do board meetings take place? Where do the directors live? Where are the major policy decisions made? Where are the shareholders and the books?

The important word is “actually”. Tax authorities look at substance over form. A board meeting held in Armagh means very little if every real decision was taken beforehand by a director sitting at their kitchen table in Dundalk.

This is where owner-managed businesses get caught. In a large group, a formal board meets quarterly in a boardroom. In a 2-director company, decisions get made on phone calls, over email and in passing. If both directors live in the Republic, it’s hard to argue those decisions are made anywhere else.

Why the treaty no longer solves dual residence automatically

Until recently, the UK–Ireland treaty had a simple tie-breaker for dual resident companies. A company resident in both countries was treated as resident only where its “place of effective management” was. That gave a clear, if not always comfortable, answer.

That rule has been replaced. Under Article 4 of the OECD multilateral instrument, which both countries adopted, the competent authorities must try to agree on a single country of residence. They do this by mutual agreement, looking at the place of effective management, the place of incorporation and other relevant factors. If they can’t agree, the company is not entitled to treaty relief except to the extent they agree.

For corporation tax, the change took effect in the UK from 1 April 2020, and in Ireland for taxable periods starting on or after 1 November 2019. Revenue’s Tax and Duty Manual on dual-resident companies confirms that an affected company has to apply for the mutual agreement procedure itself. Nothing happens automatically.

In practice, that means a dual resident company can face a corporation tax claim in both countries while waiting for HMRC and Revenue to agree. The mutual agreement procedure can take a long time, and the outcome isn’t guaranteed.

What dual residence actually costs you

The obvious risk is paying corporation tax twice on the same profits. Ireland taxes a resident company on its worldwide profits, generally at 12.5% on trading income and 25% on non-trading income. The UK taxes the same company on its worldwide profits at the UK rates, currently between 19% and 25% depending on profit levels.

The less obvious costs tend to hurt more:

• Irish corporation tax registration, returns and preliminary tax obligations you didn’t plan for
• Interest and penalties if Revenue decides the company should have been filing in Ireland for earlier years
• Uncertainty over which country’s R&D, capital allowances and loss rules apply
• Withholding tax and treaty claims on dividends, interest or royalties that rely on clear residence
• Time spent on a mutual agreement procedure rather than running the business

We often see business owners assume that because the company is registered at Companies House and files with HMRC, the Irish question doesn’t arise. It does. Revenue doesn’t need the company to have registered in Ireland to take the view that it is resident there.

Residence is not the only risk: permanent establishments

Even where residence is clearly in the UK, your home office in the Republic could create a permanent establishment there. A permanent establishment is a taxable presence. It would bring the profits attributable to your Irish activity into the Irish corporation tax net.

Under the UK–Ireland treaty, a fixed place of business through which the company’s business is carried on, including a place of management or an office, can be a permanent establishment. So can a person in Ireland who habitually concludes contracts on the company’s behalf.

A director who works full-time from a home office in Cavan, negotiates and signs customer contracts and manages the business from there is a clear risk. A director who occasionally answers emails from home while the business is run from Newry is a much lower one. The facts matter more than any single rule.

How SCC sees this play out on the border

With offices in Armagh, Moy, Cookstown, Dundalk and London, we work with a lot of businesses where the owners, staff and customers sit on both sides of the border. In our experience, residence problems rarely come from deliberate planning. They come from drift.

A typical pattern looks like this. The company was set up in Northern Ireland when the founder lived there. The founder later moved to the Republic for family reasons. The business carried on as before, with board decisions informally made wherever the founder happened to be. Nobody revisited the company’s tax residence because nothing about the company itself seemed to change.

Scenarios like these are worth reviewing:

Practical steps to manage the risk

If your company should be UK resident, the aim is to make sure that is genuinely where it’s run. That means more than moving the venue for the board meeting.

• Hold board meetings in Northern Ireland, with directors physically present where possible
• Make sure major decisions are actually taken at those meetings, not agreed beforehand
• Keep clear minutes recording who attended, where and what was decided
• Consider appointing an NI-resident director with real authority, not a nominee who signs whatever is put in front of them
• Avoid signing key contracts or approving major spending while in the Republic
• Review the position whenever a director moves, the board changes or the business expands south

Good governance records also help if HMRC or Revenue ever ask questions. A review by our internal audit services team can test whether your board processes and minutes would stand up to scrutiny. Reliable SME accounting and management reporting makes it far easier to show that board decisions were taken on proper information, at the meetings you say they were.

Sometimes the honest answer is that the company is run from the Republic and will continue to be. In that case, it may make more sense to align the structure with reality, for example by moving the trade into an Irish company. That has its own tax consequences on both sides, so plan it rather than react to it. Our company restructuring team can help you model the options and their costs before anything changes.

The director’s personal tax position matters too

Company residence and your own residence are separate questions, but they interact. If you live in the Republic, you are generally taxed in Ireland on your worldwide income, including salary and dividends from your NI company.

Under the treaty, a director’s pay is treated like employment income. Broadly, it can be taxed where the duties are performed. Work you do from home in the Republic is likely to be taxable in Ireland, and payroll may need to be split between the 2 countries.

Don’t assume Transborder Workers’ Relief will help. It’s aimed at people who live in Ireland and work outside it, and it specifically excludes pay received by a proprietary director from their own company. Our guide to remote working tax for employers in Ireland and Northern Ireland covers the payroll side in more detail.

Knock-on effects for tax reliefs and the accounts

Residence affects more than the corporation tax return. It determines which country’s reliefs the company can use, including R&D tax credits, and how transactions with connected companies are treated. If your group already has companies on both sides of the border, our guide to setting up a company in both the UK and Ireland explains how the structures interact.

Uncertain residence can also affect your financial statements. Where there is a real risk of tax being due in Ireland, your external audit team will want to understand how that exposure is assessed and whether it needs a provision or disclosure. If HMRC or Revenue later opens an enquiry, reconstructing where and how decisions were made from emails, calendars and minutes is a job for forensic accounting specialists rather than guesswork.

Frequently asked questions

Can a UK company be tax resident in Ireland?

Yes. A company incorporated in Northern Ireland, England, Scotland or Wales is always UK resident under UK law. It can also be Irish resident if its central management and control is in Ireland. Where both apply, residence for treaty purposes is decided by mutual agreement between HMRC and Revenue.

Can I run an NI company while living in the Republic of Ireland?

Yes, but it creates tax risk. If the key strategic decisions are made by you in the Republic, Revenue may treat the company as Irish resident. Your home office could also create an Irish permanent establishment. Genuine board decision-making in Northern Ireland, properly documented, reduces both risks.

Will my company pay corporation tax in both the UK and Ireland?

It can, if it is dual resident or has an Irish permanent establishment. Relief for double taxation may be available, but since the treaty changes, dual resident companies may need agreement between HMRC and Revenue before full treaty relief applies. That process can be slow and isn’t guaranteed.

What happens if HMRC and Revenue can’t agree on residence?

If the competent authorities don’t reach agreement, the company is not entitled to relief or exemptions under the treaty, except to the extent they agree. In practice, that can leave the company exposed to tax in both countries with limited relief. It’s a strong reason to address residence before it becomes a dispute.

Get your company’s residence position reviewed

If you live in the Republic and run a Northern Ireland company, the question isn’t whether residence matters. It’s whether anyone has checked where your company is actually managed. A review now is far cheaper than defending a dual residence claim later.

SCC’s dual-qualified tax team works with businesses on both sides of the border every day. Speak to our cross-border accounting and tax specialists for a clear view of your company’s residence, permanent establishment and payroll position, and practical steps to put it on a firm footing.