The biggest problem with this is trying to model tax payments in the future. In ten years, you have no idea what tax rates will be. But you can be pretty confi

The biggest problem with this is trying to model tax payments in the future. In ten years, you have no idea what tax rates will be. But you can be pretty confident the Fed will have devalued money by 30%+. Even if you just want to have tax brackets adjust to inflation - this function gets to be really complicated.