In addition to the posting regarding Washington annual fees, a huge issue is the sales or "use" tax when bringing a vessel in from another state. I think there is an exemption if you were resident in the other state and had the boat registered there for six months or more . . . something like that. But, if you don't meet the exemption, it's a tax of about 8% on the fair market value of your vessel. The flip side of the coin, Washington has no personal income tax . . . . so each has to weigh where "they" can get you!