Money and Other Monetary Instruments - U.S. Customs and Border Protection
https://www.cbp.gov/travel/international-visitors/kbyg/money
WEBMar 12, 2020 · You may bring into or take out of the country, including by mail, as much money as you wish. However, if it is more than $10,000, you will need to report it to CBP. Use the online Fincen 105 currency reporting site or ask a CBP officer for the paper copy of the Currency Reporting Form (FinCen 105).
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