One thing that you can do if you are buying a boat and motor out of state is to pay for them separately. You will have to show the receipt for the boat when you register and pay the fee, but I don't believe that they can make you show them the proof of buying the motor, so thus, no additional fee. Many years ago that was my experience. I had to pay taxes on the boat when it was registered. I had the receipt for the engine in my pocket and when the woman asked me if I purchased the motor out of state I said "Yes" and just looked at her. She never asked to see the receipt.