This info is good, but only part of the whole story.
After working a year on my project, I moved to Virginia. The publicly-owned airport where I had rented a hangar required an N-number prior to to renting me a hangar, where I completed the last 50% of work prior to flying.
During the first week in January, Virginia airport managers must give an annual report to the state of the aircraft based at their airport including owner, type of aircraft and N number. This information is forwarded to the counties.
You can easily guess what happened next. The county levied its annual property tax based on a blue book value of $50,000 as if it were a completed airplane. So then I got to lose valuable building time trooping down the county building and giving them an education on the need for an airworthiness certificate to exist before all the parts can legally become an airplane. I did get the $1000 bill reduced to $100.
Notice that I said the county levied the tax. It turns out that the state levies a sales/use tax one time on the items purchased, but that county ANNUALLY levies a 2% property tax on the plane's value.
The rate varies by county.
So, in Virginia, you pay and get to keep paying.
In other states, e.g. Ohio, Tennessee and Pennsylvania, you only pay the sales/use tax, not the annual property tax.