Britons will have to pay €7 (£6.30) every three years to travel to EU countries, as a consequence of Brexit.
The European Commission has confirmed that while UK travellers will not need a visa, they will need to apply for and buy another document.
It is called an ETIAS (European Travel Information and Authorization System) and although not launched yet, is expected to come into force in 2021.
The travel requirement is not just for the UK but for many non-EU countries.
Under the Brexit deal, EU citizens and UK nationals will continue to be able to travel freely with a passport or identity card until the end of the transition period in 2020.