Passengers are typically allowed to fly with up to 10,000 in cash or monetary instruments without needing to declare it to customs.
You are allowed to bring as much cash as you would like to carry into the United States, but any amount over 10,000 dollars must be declared. You can keep as much cash as you would like in your home.
You are usually allowed to travel with $800 in cash in Barbados.
Travelers entering or leaving the European Union with 10,000 or more in cash must declare it to customs authorities.
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Cash is private property, there is no limit to how much a person is allowed to carry. If large amounts of cash are found during a routine check by customs or the police, you may be asked why you're carrying though and your criminal background may be checked, which is the same in many other countries of Europe and the world.
If you enter or leave the EU with €10,000 or more in cash (or the equivalent in other currencies or travelers cheques, etc.) you must declare this under current EU customs regulations at your European point of entrance or exit. See the related link for more information
You can legally fly domestically with any amount of cash, but it is recommended to carry less than 10,000 to avoid having to declare it to customs.
Individuals can fly domestically with any amount of cash, as there are no specific limits on the amount of cash that can be carried. However, travelers must declare any amount over 10,000 to customs officials.
The minimum cash back allowed is $20, and the maximum is $100.
Amounts of more than AUD10,000 in cash (not traveler's cheques or bank drafts) must be reported to Australian Customs when carried into or out of Australia.
There is no limit on how much cash you can bring when crossing a U.S. border. However, if you are carrying more than $10,000, you must declare it to customs officials. Failure to do so can result in seizure of the money and potential penalties.