Some people find it both prudent and necessary to carry cash when traveling internationally. You can exchange cash for local currency upon arrival, which facilitates transactions such as purchasing small items or meals. While the U.S. government places no limit on the amount of cash you can take out of the country, the State Department recommends limiting the amount. You must also adhere to monetary reporting rules.
You are not required to report cash you intend to take out of country in amounts under $10,000. For amounts over $10,000, which includes cash, travelers' checks, bearer bonds and any negotiable instruments, you must report the amount to the U.S. Customs and Border Protection (CBP) service on departure. File the report with the FinCen 105 form, which the CBP provides on request.