Dual Nationals Entering the UK: Which Passport to Use and the ETA Rule

British citizens cannot use the UK's Electronic Travel Authorisation (ETA) scheme, since it is designed for non-British travellers. A dual national entering the UK must present a valid British passport, or a Certificate of Entitlement to the Right of Abode, which costs £589 and has issued in digital form since 26 February 2026.

The practical entry-document rule

A British citizen holds an automatic legal status called the right of abode, which exempts them from UK immigration control entirely: no visa, no permission, no time limit on how long they can stay. The ordinary way to prove this status is a British passport. The complication for dual nationals arises specifically around the UK's Electronic Travel Authorisation, or ETA, a pre-travel screening requirement introduced for visa-exempt visitors who are not subject to UK immigration control in the same automatic way British citizens are. Because a person with the right of abode is, by definition, not subject to immigration control, they are not in law entitled to an ETA, and cannot use one as their entry document even if they hold a foreign passport from a country whose nationals are otherwise eligible for the ETA scheme. This means a dual national who travels on their non-British passport, without either a British passport or a Certificate of Entitlement, has no valid document under the ETA framework at all.

The rule became a live practical issue with the introduction of mandatory airline permission-to-travel checks from 25 February 2026. Before this date, many dual nationals who preferred travelling on a foreign passport, commonly because their other nationality does not permit dual citizenship and they wished to avoid drawing attention to a second nationality, could often do so without major difficulty. From 25 February 2026, airlines are required to verify that a passenger holds valid permission to travel to the UK before allowing boarding, and a foreign passport with no ETA and no other recognised UK status attached will generally fail that check.

What happens without the correct document

A dual national who attempts to travel to the UK on a foreign passport, without a British passport, without a Certificate of Entitlement, and without an ETA, since ETA is not available to them as a right-of-abode holder, risks being refused boarding by the airline before they even reach the UK border, because the airline's automated check will not find any valid basis for travel linked to that passport. This is a boarding-stage risk, driven by carrier compliance obligations, rather than a UK Border Force decision made on arrival, which makes it materially harder to resolve on the day since it happens at check-in, often in a country where UK immigration officials have no presence. The safest position for a dual national who does not hold, or does not wish to travel on, a British passport is to obtain a Certificate of Entitlement well in advance of any UK travel, rather than attempting to resolve the position at the airport.

Certificate of Entitlement: cost, process and the digital shift

The Certificate of Entitlement to the Right of Abode is the Home Office document that proves right of abode for someone travelling on a passport that is not British. The application fee is £589, and this fee is payable regardless of outcome; it is not refunded if the application is refused. From 26 February 2026, new certificates are issued in digital form and linked to a UKVI account, rather than as a physical vignette sticker placed inside the applicant's foreign passport, which had been the only format previously available. The digital format changes the ongoing administrative burden meaningfully: a vignette sticker ceases to have effect once the passport it is stuck into expires, requiring a fresh application and a fresh fee, while a digital certificate does not expire in the same way and can instead be relinked to a new passport for free once the holder updates their UKVI account. Applicants must still keep their photograph current on a set schedule, roughly every five years under 16 and every ten years from 16 up to age 70. Processing for a straightforward application typically takes up to eight weeks, and complex cases involving descent-based or historical Commonwealth claims can take longer, so applying with adequate lead time before travel matters, particularly since non-refundable travel bookings should generally wait until approval is confirmed.

Exit checks and airline document checks

The permission-to-travel checks introduced from 25 February 2026 apply at the point of boarding a flight, sea crossing or other carrier service to the UK, meaning the airline itself is the first checkpoint rather than UK Border Force. Carriers are required to be able to verify, before departure, that a passenger holds one of the recognised forms of evidence: a valid British passport, a linked Certificate of Entitlement, an approved eVisa or immigration status, or a valid ETA where the traveller is eligible for one. A dual national relying on a Certificate of Entitlement needs it correctly linked to the passport they are actually travelling on; an outdated link, for example following a passport renewal that has not yet been updated in the UKVI account, can itself cause a boarding check to fail even though the underlying right of abode is not in question.

The mirror case: entering the other country of nationality

The same principle frequently runs in the opposite direction. Many countries expect, or in some cases legally require, their own nationals to enter and exit using that country's own passport rather than a foreign one, and a dual national arriving in their other country of nationality on a British passport can encounter friction, delay, or in some jurisdictions a formal requirement to use the local passport specifically. This is entirely a matter of the other country's own law and entry practice, not something UK guidance can confirm on a country-by-country basis, so dual nationals travelling to their other country of nationality should check that country's specific rules directly rather than assuming British passport entry will be treated the same way as it would be for a non-dual British traveller entering a third country. The broader legal position on dual nationality under UK law, including the limits on UK consular assistance while inside that other country, is covered in the dedicated guide to dual citizenship rules linked below.

Frequently asked questions

Can a British citizen apply for a UK ETA instead of using a passport?

No. British citizens hold the right of abode and are not subject to UK immigration control, so they are not in law entitled to an ETA, which is designed for visa-exempt travellers who are subject to immigration control. A British passport or Certificate of Entitlement is required instead.

How much does a Certificate of Entitlement cost?

The application fee is £589, and it is not refunded if the application is refused. From 26 February 2026, approved certificates are issued digitally and, once digital, do not require a new fee each time the holder's passport expires.

What happens if I try to board a UK flight on my foreign passport without an ETA or Certificate of Entitlement?

From 25 February 2026, airlines carrying out permission-to-travel checks can refuse boarding if no recognised document is presented. Since a right-of-abode holder cannot use an ETA, a dual national in this position risks being denied boarding entirely.

Is it simpler to just renew my British passport instead of getting a Certificate of Entitlement?

For most British citizens eligible for a passport, yes: a standard British passport is substantially cheaper than the £589 Certificate of Entitlement fee and avoids the need for a separate application. A Certificate of Entitlement mainly matters for people who have the right of abode but are not eligible for, or choose not to hold, a British passport.

Do I need to use my British passport when entering my other country of nationality?

This depends entirely on that other country's own law, which UK guidance cannot confirm. Many countries expect or require their own nationals to travel on that country's passport, so dual nationals should check the specific entry rules of their other country of nationality directly.