You will have to pay the tax somewhere. Might as well be in Fl. where you are and the tax rate is relatively low.
We bought our boat in Fl. and had the 90 day green sticker for $20. We thought we might settle in Ms. again so we didn't pay the Fl. sales tax. half-way across the Gulf, we decided that we would go back to Kemah, Tx.
We registered in Tx. and a few weeks later we received a letter from Fl. It was to inform us that they sent a letter to Ms. letting them know we didn'y pay Fl. Tax. We then had to call Ms. and explain to them what happened. They informed us that they were looking for us via US mail. All we had to do was to send Ms. a copy of the Tx. registration and sales tax we paid in Tx.
I say go for it. beat the tax man. Maybe you will get lucky and get away with it. Then when you go to sell the boat, oh well, you figure that one out.
Cruising the Eastern U.S. Inland Waterways
Presently on the Tennessee River - Joe Wheeler State Park - Rogersville, Al.