How much cash can a person carry legally?

Answer:

It is legal to carry any amount of cash, but quite imprudent to do so. The money would be suspected illegal and seized and then you have to hire a lawyer to fight for its return.
It is illegal to cross the borders of the US with more than $10,000.

(not true)



There is no limit to the amount of cash that may be carried on any flight, either domestic or international or any other means of crossing the border. The people who are saying that there is a limit on international flights or international travel of any means are not correct -- for international travel arriving in or departing from the US, you may carry as much cash as you'd like; however, any amounts in excess of $10,000 must be declared to US Customs either upon departure or upon arrival.