For the first four months of 2015 I lived in California, and earned a full time income in California, a very small part time income in Wisconsin, and rental income from an apartment in Washington DC. Then I left California and for two months I earned full time income in Wisconsin plus rental income. Then I left the US and have been traveling around the world earning occasional contract work income from various sources in the US, and rental income from apartment in DC. I have no physical residence in any state in the US, and the only property I own is in DC which is rented out.
Which state am I a resident of? I need to know this to determine where I need to pay any state tax for 2015, and going forward in 2016 especially for any consulting income that I might make from US and other sources.
I also need to determine whether or not I need to have Obamacare. Because I don't live in the US, Obamacare is going to be worthless for me, but I don't want to get penalized for not having it.