There is a tax relief available to thousands of people living in the Republic of Ireland who work in Northern Ireland, and the majority of those entitled to it have never claimed it. It sits on the Revenue books, quietly available to anyone who qualifies, and goes unclaimed year after year because people either do not know it exists or assume it is too complicated to pursue.
The Irish Transborder Workers’ Relief — sometimes called the Cross-Border Workers’ Relief or the Transborder Workers’ Allowance — is a statutory relief under Section 825A of the Taxes Consolidation Act 1997. In its most beneficial form, it can exempt qualifying employment income earned in Northern Ireland entirely from Irish income tax.
For someone living in Dundalk or County Louth who commutes to work in Newry, Armagh, Derry, or anywhere else in Northern Ireland, this could be worth thousands of euros per year. It is one of the most important reliefs covered in our cross-border business guides.
Who Is a “Transborder Worker”?
For the purposes of this relief, a transborder worker is an Irish resident who:
Holds a foreign employment — meaning they are employed by an employer based outside the Republic of Ireland (in this context, an employer based in Northern Ireland or elsewhere in the UK). Travels to that foreign jurisdiction to perform the duties of their employment. Returns to Ireland at the end of each working day — or at least frequently enough to maintain their Irish residence status.
The classic profile is someone living in south County Armagh or north County Louth who crosses the border every morning to work in Newry or elsewhere in Northern Ireland, and returns home each evening.
Post-Brexit, the rules have become more nuanced, particularly around remote working. An Irish resident who works fully remotely for a Northern Ireland employer, performing all their duties from the Republic of Ireland, is not a transborder worker under this relief — the duties are being performed in Ireland, not in Northern Ireland. The relief requires that the work be physically performed in the foreign jurisdiction.
What Does the Relief Do?
The Irish Transborder Workers’ Relief can exempt the foreign employment income from Irish income tax, provided the conditions are met.
Ireland taxes its residents on their worldwide income. This means that if you live in Ireland and earn income from employment in Northern Ireland, that income is, in principle, subject to Irish income tax. You also pay UK income tax (through your UK employer’s PAYE) on the Northern Ireland income, because the duties are performed in the UK.
Without the Transborder Workers’ Relief, you would potentially face a double-taxation situation — paying UK income tax on the income while also having it counted in your Irish worldwide income assessment. The Ireland-UK double taxation agreement prevents double taxation by providing a credit mechanism, but the administrative process of claiming credits can be complicated.
The Transborder Workers’ Relief simplifies this by exempting qualifying foreign employment income from Irish income tax altogether, provided the income was subject to tax in the foreign jurisdiction (Northern Ireland/UK in this case). You are not taxed in Ireland on income you already paid UK tax on — you simply claim the exemption on your Irish Form 11 income tax return.
What Are the Qualifying Conditions?
The conditions for the relief are set out in legislation and have been refined over the years. The key requirements are:
The individual must be resident in Ireland for tax purposes. The employment must be exercised in a foreign state — meaning the duties must actually be performed outside Ireland. The individual must perform the duties of the employment for at least one day in the tax year in the foreign jurisdiction. The income from the employment must have been subject to tax in the foreign jurisdiction under its domestic law.
In practice, for a Dundalk resident working in Northern Ireland, the key conditions are normally easily met — they are Irish resident, they travel to NI to work, and their UK employer deducts UK income tax through PAYE. The relief is available in these circumstances.
Post-Brexit Complications
Before the UK left the EU, the Transborder Workers’ Relief operated under a framework that included the free movement of workers and EU social security coordination. Post-Brexit, several elements have changed.
The fundamental income tax relief under Section 825A still applies — the legislation predates EU membership and does not depend on it. Irish residents working in Northern Ireland can still claim the relief in the same way they always could.
However, other aspects of cross-border working are now more complicated. Social security (PRSI/NIC) rules, employer compliance obligations, and the treatment of hybrid working arrangements are all affected by the changed post-Brexit framework. If your situation involves any of these dimensions, take specific advice rather than assuming the pre-Brexit position still applies.
The Remote Working Question
Since 2020, many people who were previously commuting to Northern Ireland to work have been working from home for some or all of their time. This change fundamentally affects the transborder worker analysis.
If an Irish resident is working wholly remotely from Ireland for a Northern Ireland employer, their employment duties are being performed in Ireland. The Transborder Workers’ Relief does not apply — there are no duties being performed in the foreign jurisdiction.
In that scenario, different rules apply, as I explain in detail in my article on remote working tax traps for cross-border employers. The employment income may be treated as Irish-source income, with PAYE due to Irish Revenue. The employer may have Irish employer obligations. The social security position changes. This is a significantly different analysis from the traditional commuter situation.
If you were previously claiming the Transborder Workers’ Relief and have since moved to full or partial remote working, you should review whether your claim is still correct.
How to Claim the Relief
The relief is claimed on your Irish income tax return (Form 11) for the relevant tax year. You declare your foreign employment income, claim the relief, and provide the relevant details of the foreign employment and the tax paid on it in the UK.
Supporting documentation includes evidence of your UK employment (contract, payslips, P60 from the UK employer) and evidence that UK income tax was deducted from the income.
If you have not been claiming this relief and believe you have been entitled to it in previous years, you can make a retrospective claim for the four years prior to the current year. Revenue will review the claim and issue a repayment if the refund is due. For someone who has been commuting to Northern Ireland for several years without claiming, this could represent a meaningful sum.
A Note on the Overall Cross-Border Position
The Transborder Workers’ Relief is one piece of a more complex cross-border tax picture. The interaction with the Ireland-UK double taxation agreement, the PRSI/NIC position, and the employer’s obligations in both jurisdictions — including the potential need for dual payroll across both jurisdictions — all need to be considered together.
In this region — Dundalk to Newry is a short drive — cross-border employment is a fact of daily life for thousands of people. Getting the tax position right is not optional; Revenue and HMRC are both focused on cross-border compliance, and the consequences of getting it wrong compound over time.
If you are commuting cross-border, employing cross-border workers, or have any cross-border employment situation and you have not had it professionally reviewed, that review is overdue.
Paddy Malone FCA AITI
Paddy is the principal of Malone & Co. Chartered Accountants in Dundalk. A Fellow of Chartered Accountants Ireland and a Chartered Tax Consultant with the Irish Tax Institute, he has been advising businesses across County Louth and the North-East for over 35 years.