When traveling from the UK to any European Union country, you are permitted to carry up to €10,000 (or the equivalent in GBP or other currencies) without needing to make an official declaration. This limit applies to "liquid assets," which includes banknotes, coins, traveler's checks, and even signed checks or money orders. If you are carrying €10,000 or more, you are legally required to declare the funds to the customs authorities at the point of entry into the EU. You will need to fill out a "Cash Declaration" form, stating where the money came from, who owns it, and what it is intended for. Failure to declare amounts over the limit can result in the cash being seized, a significant fine, or even a criminal investigation for money laundering or tax evasion. It is important to note that this is not a "tax" on your money; it is simply a reporting requirement for border security. If you are a couple traveling together, the limit usually applies per person, but it is always safest to declare if you are anywhere near the threshold to avoid any misunderstandings with border officials.