Quick answer
There is no limit on how much cash you can fly with, but you must declare large amounts. The threshold is 10,000 in local currency in the UK (£), the EU (€), Canada and Australia, and more than $10,000 in the United States. Not declaring can lead to the cash being seized.
Source: GOV.UK: bringing cash into the UK, checked 7 Nov 2026
How much cash must I declare in each country?
| Country | Rule | Source |
|---|---|---|
| United Kingdom (Great Britain) | Declare £10,000 or more when travelling between Great Britain and a country outside the UK; groups declare their combined total. Northern Ireland: €10,000 to or from outside the EU and UK. | GOV.UK checked 7 Nov 2026 |
| European Union (27 countries) | Declare €10,000 or more entering or leaving the EU. No EU-wide rule for travel between EU countries. | Your Europe (European Union) checked 7 Nov 2026 |
| United States | Report more than $10,000 in currency or monetary instruments brought into or taken out of the country, on FinCEN Form 105. | U.S. Customs and Border Protection checked 7 Nov 2026 |
| Canada | Declare currency and monetary instruments worth CAN$10,000 or more when entering or leaving Canada. | Canada Border Services Agency checked 7 Nov 2026 |
| Australia | Declare AUD 10,000 or more in cash (Australian and foreign combined) entering or leaving, using the online form before customs. Bearer cheques payable to anyone must also be reported. | AUSTRAC checked 7 Nov 2026 |