Question:  “At exchange do they [the bank] file anything…?”  They’re not going file anything.  You’re on your own when you exchange your currency.  It is your responsibility to report your capital gains…to pay your taxes.  The banks are not going to tell Uncle Sam anything about you… [Community Comment] The bank automatically will report to the IRS any deposits of $10,000 or more.  FRANK:  that’s true, any transaction worth over $10,000 ends up in our governments lap.  [Note:  Always consult your tax professionals to determine the proper taxes for your unique circumstances.]