In 2026, there is no technical "limit" on how much cash you can physically carry from the UK to Spain, but you must follow mandatory declaration rules. If you are carrying €10,000 or more (or the equivalent in GBP, roughly £8,300), you must declare it to UK Customs before departing and to Spanish Customs upon arrival. Failure to declare such amounts can lead to the seizure of the funds and heavy fines. Additionally, Spanish border officials may apply the "£97-a-day rule" for non-EU visitors, meaning they can ask for proof that you have at least €118 per day (or a flat minimum of €1,065 for longer stays) to support yourself. This doesn't have to be in cash; proof of a credit card and a recent bank statement is usually sufficient for 2026 travelers.