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If accepting more than $10K in cash for a used boat, should I worry about counterfeiting?
I'd be a bit concerned about someone who wanted to transact that large of a transaction in cash.  Also consider what you are going to do with the funds, if you deposit it, you will need to tell the bank where it comes from. Why does the bank want to know, because most legal businesses don't transact business with large sums of currency.. What does that tell you about the likelihood the person you are about to do business with is a criminal or involved in criminal affairs?  The lower bill of sale price might be more than just to dodge taxes, it could be part of money laundering..  If they can turn right around and 'sell' the boat for $10K, or trade it in on a bigger boat for the same amount, and have a bill than says $4K, then they have just come up with a legal explanation for how they made 6 grand.  and you could potentially be considered an accomplice if someone is checking up on their finances. Really, is it worth the risk.