Thank you! That definitely clarifies things. I still have a couple more specific questions.
- Is the income earned from my WA based employer while in MO as a non-resident considered MO sourced then?
- Based on the answer to #1, If I do not have any MO sourced income while living in MO as a non-resident, do I still need to file a part year non-resident return? It seems like MO would certainly want some form of income tax for that period, but the non resident return seems to be more catered for working for a company in state A that collects income tax while residing in State B that does or does not collect state income tax.
- Can we call ourselves non residents of MO and residents of WA from March through September if we were living in MO working remotely? Or do we need to consider ourselves MO residents for the whole year? I am still a little confused as to what depends purely on where you are and what is contingent on the active steps to change your domicile that you mentioned.
- How specific do we need to be when determining MO sourced income? For things like capital gains, does it matter when we sell stock or do we just look at the yearly totals and split between time as a MO resident and WA resident? For things like cash bonuses, does it matter where you are for the pay period where you get the bonus or is that just split across the whole year?
