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If someone gives me cash legally, can my deposit trigger an audit for them?
Am I right to worry about both of these? Of course. Who carries $75K in cash for no good reason? Your friend got the cash from somewhere, didn't he? If its legit - there's paper trail to show. Same for your parents. If you/they can show the legit paper trail - there's nothing to worry about, the hassle, at worse, is a couple of letters to the IRS. If the money is not legit (your friend is selling crack to the kids in the hood and your parents robbed a 7/11 to give you the money, for example) - there may be problems.