I worked / lived in a foreign country for most of the year.

[bab_em]

What do I put as state of residence?

[ToddL]

You generally remain a resident of the same U.S. state where you resided before going overseas to work.

When you complete the Personal Interview:

1. Enter your state of residence at the time you left to work overseas  as your "state of residence";
2. Answer "No" when asked if you "Lived in another state in 2016?" That question only applies if you changed your state of residence in 2016.
3. When asked if you "Earned money in another state?", answer "Yes". That "Other state" would be a U.S. or Foreign Possession", the last choice on the drop-down menu.

What makes you a resident of a state (or country)? 

 Generally, you're a resident of a state (or country) if you intend to either stay there permanently, or return there after a temporary absence. It's where home is – where you come back to after being away on vacation, business trip, overseas or out-of-state employment, or school. Many factors are considered, not the least of which are where you are registered to vote, own homestead property and are licensed to drive.