The following was submitted in the form of a comment:
I’d like to have some opinions about the bill that I’m writing to replace citizenship with residence-based taxation. Maybe someone could move this to a different page if it gets too long. By the way, I’m about one third of the way through with the relevant sections in the Internal Revenue Code.
1. To define residence, I am using the current substantial presence test with all of its rules and exceptions. This is the definition that is currently used for foreigners without a green card, so I am just applying it to everyone. I am also adding an exception to consider US government or military employees abroad as residents, because their salaries are sourced in the US and they would pay higher taxes if they were considered nonresidents. I am also adding that US citizens and permanent residents who don’t satisfy the substantial presence test may elect to be treated as residents for tax purposes by simply filing the normal resident tax forms (1040). I understand that there are some cases where this may be beneficial, and I don’t want to increase taxes on anyone.