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If accepting more than $10K in cash for a used boat, should I worry about counterfeiting?
If you get counterfeit money, then you're dealing with the criminal who is going to be punished by the law for doing that. The portion of the total sum that was paid with the counterfeit currency is considered unpaid and you can claim the money from the criminal and sue him, while he's in jail. He'll work hard on those license plates to pay you off. However, making false statements and assisting in a tax evasion scheme compromises your ability to go to the law enforcement in case of any wrongdoing, and then you should worry about the counterfeit money, because the law won't be on your side to help you. And you don't even get anything out of it... Why on earth are you willing to take this risk? Just so you know, it may also be money laundering, which may get you in trouble even more with the law.