If you buy from an out of state dealer you have to pay 7% of what is on the invoice. If you buy from an out of state individual you have to pay 7% on the value of the boat. This was due to people buying from an individual and having the seller list the boat for less then what they actually paid for it on the bill of sale. The tax people caught on to this. That is why if you buy from an out of state individual they tax value not bill of sale. Motor doesn't need a title trailer only in MS.