I am an Oregon resident but earned all my income in Washington state in 2011 - do I need to file an OR tax return since I didn't earn any money in Oregon ?
Yes. Here's the answer to this question from oregon.gov:
3. I am moving into Oregon. What income will be taxed by Oregon?
As an Oregon resident, you are taxed on ALL income regardless of the source of the income. This includes, but is not limited to:
- Interest and dividends;
- Retirement income, even if earned prior to moving to Oregon;
- Rental income;
- Partnership and S-Corporation income;
- Business income;
- Unemployment benefits.
You may need to pay estimated taxes if you don't have Oregon withholding on your income.
Unfortunately, you are required, but most states do have agreements with neighboring states that let the states share the collected taxes without the person having to pay double taxes. So being as this is your first tax return in your current situation, you might be wise to have a professional fill it out for you this year and then next year you can use it as a template.
Additionally, I really would like to see someone challenge this across state lines taxation in court. It sure seems to me that it is a inter-state tariff/duty, which the state's are expressly forbidden from doing in the constitution.