Moving to Ireland: How Cross-Border Taxes Work
Landing in Ireland with an accepted job offer and an apartment sorted feels great — until the first payslip arrives and half your salary is gone to emergency tax. Here's what actually decides how Ireland taxes you in your first year.
Residence — where you spend your days
You're tax resident in Ireland if you spend 183 days here in a tax year, or 280 days across two consecutive years (with at least 30 in each).
Residence is a headcount. It doesn't care about your visa, your intention or your bank account — it counts days.
Domicile — where your roots are
Domicile is separate. Broadly, your domicile is your permanent home — usually the country you were born in, unless you've replaced it.
If you're resident in Ireland but non-domiciled, you're taxed on Irish income and any foreign income you remit to Ireland — the ‘remittance basis’.
Split Year Treatment — the year you moved
In the year you move to Ireland to take up employment, you can usually elect for Split Year Treatment. The effect: your foreign employment income before you moved isn't taxed in Ireland.
Most expats miss this. It's a one-line election, but it can be worth thousands.
Double-tax treaties — same money, taxed once
Ireland has treaties with more than 70 countries to stop the same income being taxed twice. If you've already paid tax abroad on income that Ireland is now taxing, treaty relief usually gets you credit for what you paid.