Sadly enough, in the vast majority of circumstances, not nearly enough.
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Many labor under the unfortunate misapprehension that they can avoid taxes of various kind by having the asset held in the name of a Delaware (or, sometimes, Nevada) corporation. While that can sometimes delay the detection of the asset by the taxing authorities, it in no way defers or excuses the taxes, and ultimately the owner gets to pay all the taxes, plus the penalties and interest. Even better, they get to pay penalties and taxes for the corporation, because they failed to register it as a foreign corporation in their home state.
Btw, it ** can ** work better for yachts, if they never come to the home state (like someone who lives in a high tax state but keeps the Big Honkin' Yacht in Bimini). Rarely applicable to airplanes, which (presumably) we tend to have convenient to where we are so they can be used.
Bottom line: in the vast majority of circumstances, the principal value of incorporating in Delaware is to the incorporation service, in that they collect fees from the transaction.