I live in Washington (no state tax), my company is located in Oregon, but I travel to 14 states for work. What state tax do I pay?

[amys6866]

I am a sales rep and travel every week, spending 5 days a month in Oregon, the rest in multiple states but I live in Washington where there is no state tax.

[ToddL]

Unless your employer is reporting income and state tax withheld from another state (Boxes 15 - 17 of Form W-2), you don't need to file any state tax returns. 

For the vast majority of people who travel as part of their work, their income is considered as earned in the state where they are based, i.e. where their business travel starts and ends. Sales representatives and airline pilots are common examples of this approach. 

(The most common exceptions for this rule are professional athletes and entertainers; they are required to calculate how much of their annual pay is earned in each place they play/perform).