Ireland–UK Cross-Border Tax for Remote Workers in 2026

Remote and hybrid working made Ireland–UK cross-border tax a daily issue for thousands of employees, contractors, and company directors. Brexit did not remove the double taxation agreement — but it did change how employment law, social insurance, and payroll interact when someone lives in one jurisdiction and works for an employer in the other.

Getting residency, days present, and employer location wrong can mean double tax, unexpected Form 11 filings, or HMRC/Revenue compliance letters. The rules below reflect 2026 practice under the Ireland–UK double taxation convention.

Irish tax residents are generally liable to Irish income tax on worldwide income. UK residents are liable to UK tax on UK-source income and, for remittance-basis cases, on foreign income brought to the UK.

You can be tax resident in both countries in the same year if you exceed each country's day tests. The treaty tie-breaker then looks at permanent home, centre of vital interests, and habitual abode — not merely where your employer is registered.

Keep a contemporaneous day count. Revenue and HMRC increasingly ask for evidence in compliance checks when cross-border workers claim full relief in one state only.

Under the treaty, employment income is usually taxable where the work is physically performed, subject to exceptions when the employee is present in the other state for 183 days or fewer in the tax year, paid by an employer not resident there, and not borne by a permanent establishment.

Remote work from your home in Cork for a London employer can create Irish tax on duties performed in Ireland even if PAYE is operated in the UK — treaty relief may credit UK tax against Irish liability, but both returns may still need filing.

Directors and senior employees face additional scrutiny — substance, decision-making location, and company management tests can override simple employment articles.

Irish employers must operate PAYE, USC, and PRSI on Irish employments. UK employers operate PAYE and National Insurance. Cross-border arrangements sometimes use A1 certificates or bilateral social security agreements to prevent double PRSI/NI — verify status rather than assuming one payroll covers both.

Contractors may fall under RCT in Ireland or IR35/off-payroll rules in the UK depending on structure. An Irish-resident individual contracting for a UK client is not automatically outside Irish self-assessment.

Umbrella companies operating across the border need separate compliance for each payroll regime — employees should confirm which country receives their tax payments.

Document where each working day was performed. Align your employer's payroll with treaty analysis — request a payroll review if you moved country mid-year.

File Form 11 in Ireland or Self Assessment in the UK when required, claiming foreign tax credit relief with supporting payment evidence.

FinnAccountings maps transactions by entity and jurisdiction, flags cross-border income streams, and drafts relief claims — start a free trial if you split time between Ireland and the UK.