Travelling between Ireland and the UK: what the Common Travel Area allows

The Common Travel Area (CTA) lets British and Irish citizens move and live freely between Ireland and the United Kingdom, but a briefing published by the House of Commons Library on 15 October 2026 highlights that passport-free travel now works mainly in theory. In practice, travellers crossing by air or sea are increasingly asked for documents.

Key facts

• The CTA covers the Republic of Ireland, the United Kingdom, the Isle of Man and the Channel Islands.
• There are no frontier controls at all on the Northern Ireland land border.
• Most airlines and ferry companies now require passports on CTA routes.
• Irish citizens can live and work in the UK with no visa or work permit; British citizens have similar rights in Ireland.
• Visas are generally not mutually recognised, except under the British–Irish visitor visa scheme for Indian and Chinese nationals.

What is the Common Travel Area?

The CTA is a long-standing arrangement, in various forms since the establishment of the Irish Free State in 1922, under which the two governments treat each other's citizens in a broadly similar way. The Irish government's summary of the principle is that people can move between the two jurisdictions and reside and work in either without needing special permission.

The briefing covers travel between the UK and Ireland and the rights of Irish citizens in the UK. It does not deal with the Isle of Man or the Channel Islands, which are not part of the UK, or with the rights of British citizens in Ireland.

Do I need a passport?

A 2019 agreement states that the arrangement facilitates free movement only for UK and Irish citizens. British citizens are not treated as 'non-nationals' under Ireland's immigration laws, and Irish citizens are largely exempt from UK immigration laws.

Even so, British and Irish citizens often need to carry a passport when travelling by air or sea. Passengers arriving in Ireland from Great Britain usually face border controls at the port or airport, though not in the other direction. The majority of airlines and ferry companies now insist that British and Irish citizens use passports on CTA routes.

What about other nationalities?

The CTA is not designed to give non-British or non-Irish citizens free movement or residence, and visas are generally not recognised across both countries. The exception is the British–Irish visitor visa scheme for Indian and Chinese nationals.

Entering Northern Ireland from Ireland or Great Britain is usually straightforward without a passport or immigration authorisation. The two governments cooperate on unauthorised travel through regular meetings and data sharing, though they do not disclose how this works. Immigration authorities carry out occasional checks within their own territory: Operation Gull in the UK and Operation Sonnet in Ireland.

In March, the British and Irish prime ministers agreed to expand immigration data sharing to prevent the "abuse of CTA free movement by those not entitled to its benefits". No timetable or further detail on the expanded data sharing has been published in the briefing.

What rights do Irish citizens have in the UK?

Irish citizens can take up long-term residence in the UK with no visa or work permit requirements and are treated as though they hold permanent immigration status or British citizenship. That means they can work and use public services without the restrictions applying to other migrants. British citizens have similar rights in Ireland.

The domestic legal basis for access to healthcare, education and other services is complicated. The arrangements sit in a non-binding memorandum of understanding between the two governments rather than a formal treaty, which some academics argued should follow Brexit. The special treatment of Irish citizens predates joint EU membership, and the UK Government has implemented it in practice for the past 100 years.

What this means for travellers

British and Irish citizens should still carry a passport when flying or sailing between the two countries, since carriers require one and Irish border controls usually apply on arrival from Great Britain. Travellers of other nationalities cannot rely on CTA exemptions and should check the entry rules that apply to them before travelling.

No changes to the CTA itself have been announced. The briefing notes that the two governments continue to meet and share data on unauthorised travel, with the expansion of that data sharing agreed in March still to be set out in detail.