Earlier quoted context omitted.
If you have RSUs that were in while you were working in California or a resident of California, the Franchise Tax Board claims a portion of the income as California source when (if) they finally vest. That could be years later, when you're no longer a resident. If you move from California to another country, and are subject to US Federal Income tax, and don't qualify for an exemption, the Franchise Tax Board still co…
In this case, one also assumes that Musk will continue to spend a fair bit of time in the state. Low-profile people can usually get off with just paying taxes in their home state even though they spend a lot of their time at company offices, conferences, etc. elsewhere. But presumably there is some threshold beyond which you're supposed to be filing taxes in other locales.
Income taxes has so many bad consequences. It would be great to ban it and replace it with land value taxes.