[jjeaff]

Depends. You could probably file in CA and show your proof that you actually live and pay taxes in another state without anything getting back to your employer. Also, due to the progressive taxes in states like CA, you can actually end up paying less taxes on lower incomes.

[NotSammyHagar]

They need to define the boundaries. Is it just taxing? Some places have uniform taxes over the whole state basically (Washington state, except for B&O taxes). People already lived 30 or 40 miles away from Seattle and faced long daily commutes. They were working in the office. Now they work from home, would that be different for facebook? What if I have a vacation home that I'm living in for a month or a rental or whatever. Does that change anything about a companies wfh?

I don't have to change anything about taxes or drivers license or domicile and I can stay in my theoretical second house for a long time in wa state, 400 miles away. Probably fb would say that's not living in seattle. What if I commuted to a shared aprt in seattle for 3 days a week, is that living there?