Hi! 

I have a client who is an Oregon resident. Because of this, every time I enter numeric data. (i.e. interest / dividend income and 1099-R figures), the location code defaults to Oregon, instead of US. My question is: Does using the Oregon location code change what / how the data gets reported on the federal return? Or, does it simply help the software collect data for the Oregon return? Further, My client is a part-year Oregon resident this year (sharing with Washington State), so do I need to allocate earnings like dividends, interest, and retirement to both OR and US (WA doesn't have income tax/ doesn't require a return)? 

Thank you so much for your help!