Ireland Tax Residency (183-day and 280-day rules)

Key parameters
Threshold	183 days
Period / Window	Calendar year (1 Jan – 31 Dec)
Counting	Any part of a day
Alternative	280 days / 2 consecutive years, ordinary residence, domicile

You are an Irish tax resident for a year if you meet either of two presence tests:

• 183-day rule — 183 days or more in Ireland during the tax year, which runs 1 January to 31 December.
• 280-day rule — 280 days or more counting the current tax year and the one before it together. A year in which you spent 30 days or fewer in Ireland is disregarded, so a single heavy year can't drag a barely-visited one into residency.

Presence alone decides both. No home, family or economic-ties test runs alongside them, and nationality makes no difference either way.

Two further statuses sit on top of residence and are commonly confused with it. Ordinary residence attaches once you have been resident for 3 consecutive tax years, starting from the fourth, and it survives departure until you have been non-resident for 3 consecutive years. Domicile is a separate concept again — broadly the country you treat as your permanent home — and it is what decides whether foreign income is taxed as it arises or only when brought into Ireland.

• The 280-day test catches people who never reach 183 in either year. Two years of roughly 140 days each clear it comfortably, even though neither year comes close to the single-year threshold on its own.
• Time spent airside doesn't count. Passing through an Irish airport or port without entering the State is not a day of presence, so a connecting flight leaves your count untouched.
• A day you couldn't leave may be disregarded. Where unforeseen circumstances beyond your control prevent you departing as planned, that day can be treated as not spent in Ireland.
• Ordinary residence outlives residence. Someone who leaves after several Irish years remains ordinarily resident until 3 full non-resident years have passed, and stays within the charge on certain income throughout.
• Residence and domicile pull in different directions. A resident who is not Irish-domiciled is generally taxed on foreign income only to the extent it is brought into Ireland, so 2 people with identical day counts can face very different bills.

Residents are taxed on worldwide income while nonresidents pay only on Irish-source income, so a misjudged position usually surfaces as foreign income left off a return. Revenue applies tax-geared penalties graded by behaviour: 20% of the tax difference for careless behaviour without significant consequences, 40% where the consequences are significant, and 100% where the default is deliberate. A late return attracts a separate surcharge on top, and interest runs from the original due date regardless of which category applies. Professional tax advice is strongly recommended in situations like this.

Clearing the single-year threshold

You move to Dublin in March for a contract and are in Ireland for about 250 days by 31 December. That passes 183 days inside one calendar year, so you are an Irish tax resident for that year on the first test alone.

Two moderate years that add up

You spend roughly 145 days in Ireland one year and 140 the next, never approaching 183 in either. Added together the 2 years come to 285, which passes the 280-day threshold, so you are resident for the second of them.

A brief year that gets disregarded

You spend 260 days in Ireland one year, then only 20 the next after moving abroad. The second year falls at or below 30 days, so it is left out of the 280-day calculation entirely and cannot make you resident for that year.

• Revenue — How to know if you are resident for tax purposes
• Revenue — How to know if you are ordinarily resident for tax purposes
• Revenue — Code of Practice for Revenue Compliance Interventions