Share your insights or perspective on the financial matter presented in the input.

What happens if one brings more than 10,000 USD with them into the US?
Bad plan. This seems like a recipe for having your money taken away from you by CBP.  Let me explain the biases which make it so.  US banking is reliable enough for the common citizen, that everyone simply uses banks.  To elaborate, Americans who are unbanked either can't produce simple identity paperwork; or they got an account but then got blacklisted for overdrawing it. These are problems of the poor, not millionaires.  Outside of determined "off the grid" folks with political reasons to not be in the banking and credit systsm, anyone with money uses the banking system.  Who's not a criminal, anyway.  We also have strong laws against money laundering: turning cash (of questionable origin) into "sanitized" cash on deposit in a bank.  The most obvious trick is deposit $5000/day for 200 days. Nope, that's Structuring: yeah, we have a word for that.  A guy with $1 million cash, it is presumed he has no choice: he can't convert it into a bank deposit, as in this problem - note where she says she can't launder it.  If it's normal for people in your country to haul around cash, due to a defective banking system, you're not the only one with that problem, and nearby there'll be a country with a good banking system who understands your situation.  Deposit it there.  Then retain a US lawyer who specializes in this, and follow his advice about moving the money to the US via funds transfer. Even then, you may have some explaining to do; but far less than with cash.  (And keep in mind for those politically motivated off-the-financial-grid types, they're a bit crazy but definitely not stupid, live a cash life everyday, and know the law better than anybody. They would definitely consider using banks and funds transfers for the border crossing proper, because of Customs.  Then they'll turn it into cash domestically and close the accounts.)