Thank you @ErnieS0 ... so his employer states that he has to work 50% of his time in Oregon. He works closer to 60 - 65% from his home office here in WA, but since he's allowed to claim 50% of his wages as earned in WA state, I can just manually enter 50% of his annual earnings from his W2 in the Oregon Source Income and Adjustments line and he only has to pay state taxes on half of his annual wages, correct? He has a calendar and mileage log to backup all of his time in the field.
