There are of course two tax issues WRT buying and building a plane. Some states have annual personal property tax assessments on capital goods (cars, planes, boats) - where this thread began. Other states (such as mine, Florida) don't annually assess tax on those kinds of assets. However, it's far more common (tho' still not universal) for states to have a sales or use tax assessment in place for such assets (which I think at least one or two of the above posters are referring to). As I learned when calling up the Tallahassee's Dept. of Revenue, Florida expects one to pay sales tax on the value of each kit as it's received. (They of course expect us to pay sales tax on virtually everything we buy...). Unlike most purchases, however, Florida gets help from the U.S. Coast Guard (when it comes to documented vessels) and the FAA (for planes), so that sooner or later one receives a (sales) tax assessment from the State, even if the kit purchases were 'invisible' to the State. And related to this, if one later transfers the aircraft to another state, that payment of sales tax may be considered as the basis for avoiding (or reducing) the use tax the second state may levy on the asset.
But here's a question I'd welcome comments on: Why invite this tax issue a year or three before it's necessary? Why file for an N number well ahead of when the kits are close to becoming an a/c, when one can avoid the assessment of sales tax (and for states like California, assuming one is home building, the annual personal property tax) that the N number generates? One might lose a chance for a given N number if waiting, but wo't there be 'new' N numbers available at a later date that aren't available earlier? Beyond the satisfaction of holding an N number, doesn't filing for one just make life more complicated and more expensive sooner? I realize it's a very popular thing to do...but perhaps out of ignorance, I just don't get it.
Jack