Moving to Ireland: How Cross-Border Taxes Work

Tax residence isn't about your passport

Irish tax residence has nothing to do with nationality or visa status. It's decided by days spent in the country, and there are two tests.

The 183-day test. You're Irish tax resident for a year if you're present in Ireland for 183 days or more in that tax year. The tax year is the calendar year, January to December.

The 280-day test. If you don't hit 183, Revenue looks at the current year plus the previous one combined. 280 days or more across the two, and you're resident in the second year.

But that second test has a condition attached that most summaries leave out, and it changes the answer completely: the 280-day test does not apply in any year where you're present in Ireland for 30 days or fewer. Compare two cases:

Same total. Opposite outcome. If you've read anywhere that 280 days across two years makes you resident full stop, that's the missing half of the rule.

How days are counted matters too. You're present in Ireland for a day if you're here for any part of it — landing at 11pm counts as a full day, and so does your departure day. There are narrow exceptions: time spent airside in an airport or port, and days where you were prevented from leaving as planned by something unforeseen and unavoidable, like severe weather or an aircraft breakdown. Revenue sets out the tests on its residence page.

Then there's ordinary residence, which most guides skip entirely and which matters enormously if you stay a few years.

Ordinary residence is about the pattern of your life rather than a single year's day count. Once you've been Irish tax resident for three consecutive tax years, you become ordinarily resident from the start of the fourth year. And here's the part that catches people leaving: once you have it, you keep it until you've been non-resident for three consecutive tax years.

So someone who lives in Ireland for four years and then moves to Singapore is not finished with the Irish tax system on the day they board the plane. Ordinary residence is particularly significant for capital gains: an individual who is resident or ordinarily resident is within the charge to Irish CGT on disposals of assets wherever they're located. Selling a property back home two years after leaving Ireland is exactly the scenario people don't see coming.

Once resident, Ireland generally has the right to tax your worldwide income — subject to the two big qualifications that follow.

Split Year Treatment

If you arrive partway through the year, Split Year Treatment means your employment income is only within the Irish net from your arrival date, rather than for the whole calendar year. It applies to employment income only — not rental income, not investment income, not directorship income.

Here's what that's worth. Say you arrive on 1 May. January to April you worked abroad and earned the equivalent of €25,000. From May to December you earn €48,000 in Ireland. You're comfortably Irish tax resident for the year.

A €10,000 difference. You'd normally reduce the first figure by claiming a credit for the foreign tax already paid on that €25,000 — if the other country took €6,000, your net Irish exposure drops to around €4,000. But you'd have to document and claim that credit, and the relief is capped at the Irish tax attributable to the foreign income. Split Year Treatment removes the problem rather than managing it.

One process change worth knowing. This used to involve writing to Revenue. Following the Finance Act 2024, for arrivals from 1 January 2025 onwards you self-assess your eligibility and claim it in your Income Tax Return for the year. The relief works the same way in reverse when you eventually leave — covered in the leaving Ireland guide.

Non-domiciled status & the remittance basis

Residence and domicile are not the same thing. Domicile is a legal concept about where your permanent home is — broadly, where you intend to end up. You can live in Ireland for years, be firmly Irish tax resident, and remain non-domiciled.

If you're resident but non-domiciled, foreign investment income and foreign gains are generally only taxed in Ireland to the extent you remit them here. Employment income for duties performed in Ireland is taxed normally either way — the remittance basis doesn't touch your salary.

The part people get wrong is what counts as a remittance. It isn't only a bank transfer to an Irish account. Broadly, bringing the money into Ireland in any form can be a remittance — including spending it here. Paying an Irish expense with a foreign card funded by foreign income is not obviously outside the net just because the money never sat in an Irish bank.

There's also a distinction between remitting capital you already held before becoming Irish resident and remitting income or gains arising while you're resident. Mixing the two in one account is how a clean position becomes an unclear one. If you're planning to bring significant money into Ireland, the sequencing and the account structure matter, and they're much easier to get right in advance than to unpick afterwards. The wider picture is in the complete guide.

Double taxation agreements

Ireland has tax treaties with most major countries, designed to stop the same income being taxed twice. If you still earn income from home — rent, a pension, freelance work, dividends — the treaty usually decides which country has the primary taxing right, and the other gives credit for tax already paid.

The practical point: none of this happens automatically. You claim treaty relief or a foreign tax credit yourself, on your Irish return, and you need to be able to evidence the foreign tax actually paid. A foreign payslip showing a deduction is usually not enough on its own — you generally want the foreign tax authority's own documentation.

Note also that a foreign tax credit is capped at the Irish tax attributable to that income. If the other country taxed it more heavily than Ireland would, you don't get the excess back from Revenue.

US citizens: a special case

If you're a US citizen or green card holder in Ireland, none of the above changes your US filing obligation. The US taxes on citizenship, not residence, so you file a US federal return every year regardless of how long you've been gone.

The Foreign Earned Income Exclusion can shelter a substantial amount of Irish employment income, and Irish tax paid can generally be credited against US tax via Form 1116. Which of the two works better in your case depends on your income level and the mix — they interact, and choosing wrongly is a real cost.

Two things that catch Americans out more often than the income tax itself:

• FBAR (FinCEN Form 114). If your foreign financial accounts exceed the reporting threshold at any point in the year, you file it — and that's aggregate across accounts, so an Irish current account plus a savings account plus an old account at home can trip it without any single one looking large. It's separate from your tax return, filed separately, and the penalties for missing it are disproportionate to the effort of filing.
• Mismatched deadlines. The Irish and US tax years both run on the calendar year, which is convenient. The filing deadlines, extensions and payment dates do not line up, and Irish tax paid after a US deadline complicates the credit.

This is the overlap where general guidance stops being useful. If you're a US person with Irish income — or worse, Irish income plus assets at home — our VIP Premium service exists for exactly this kind of multi-jurisdiction position.

What Revenue will ask you for

Cross-border positions get queried more often than domestic ones, and the burden of proof is yours. Keep:

• Documented arrival and departure dates — flights, tenancy start, employment contract start.
• A day count, if you travel regularly. A calendar you maintain contemporaneously is worth far more than one reconstructed under pressure two years later.
• Your foreign employment contract or employer letter, if you're claiming Split Year Treatment.
• Foreign tax certificates from the other country's revenue authority, for any foreign tax credit.
• Records of remittances, if you're non-domiciled — what came in, when, and from which source.

What matters in your first year

For most people on a standard employment contract, the priorities are short:

1. Confirm your residence position for the year — count the days properly, including partial ones.
2. Claim Split Year Treatment if you arrived partway through the year and had foreign employment income before that.
3. Check whether a treaty applies to any income you still receive from home, and gather the evidence for the credit.
4. Make sure your Irish payroll is right. Most new arrivals spend their first months on emergency tax without realising it — see emergency tax in Ireland for how to check and fix it.

How these play out depends a lot on where you've come from — which treaty applies, how your home country treats you once you've left, and what you've left behind there. We've written country-specific guides covering the largest groups working in Ireland, including the UK, India, Poland and the United States.

Getting these right in year one can be worth thousands. Getting them wrong usually means overpaying tax you were entitled to avoid, and only finding out when the four-year window has started closing.

Questions we get asked

I'm resident but non-domiciled. Do I have to declare foreign income I haven't remitted?

The remittance basis governs what's taxable, which isn't the same question as what's reportable. Your Irish return has fields covering foreign income and gains, and the correct treatment depends on your specific position. Don't assume that "not taxable" means "not mentioned" — that assumption is the most common way a non-dom position goes wrong.

I work remotely from Ireland for an employer abroad. Where does that get taxed?

Duties performed in Ireland generally give Ireland the taxing right over that employment income, regardless of where your employer sits or where you're paid. Whether your employer needs an Irish payroll, whether a treaty article changes the outcome, and what happens with foreign social security are all live questions — this is one to get checked rather than assume.

I still have bank accounts at home. Can Revenue see them?

Under the Common Reporting Standard, financial institutions in participating jurisdictions report account information to their own tax authority, which exchanges it with the country of tax residence. So yes, information flows. The practical implication is that your Irish return should be consistent with what's being reported.

I've been here three years. What changes now?

You're likely becoming ordinarily resident from the start of your fourth year. The main effect is a wider capital gains exposure — ordinarily resident individuals are within the charge to Irish CGT on assets wherever situated. If you own property or investments abroad and are thinking about selling, the timing question is now an Irish one too.

Does any of this affect my immigration status?

No. Tax residence and immigration permission are decided by different bodies under different rules. Being tax resident doesn't grant you anything immigration-wise, and your visa type doesn't determine your tax residence.