If you receive money out of the blue, then you credit your "Received Money Out of the Blue" account and debit your "Cash" account. An account doesn't have to b

If you receive money out of the blue, then you credit your "Received Money Out of the Blue" account and debit your "Cash" account. An account doesn't have to be money that you actually owe someone and have to pay back, but regardless of whether you have to pay the money back or not, you still want to track where the money came from and where you put it. The amounts have to balance because you can't create or destroy money unless you are the Federal Reserve.