You are not being double-taxed if you allocate your Total Income between CA and DC.
As you said, you are basically reporting the amount earned while physically present in each state (according to your W-2s).
Since you received two W-2's with the CA and DC amounts already broken out for you, use those amounts in Box 16 and 17 when reporting each state.
When DC asks for 'income while residing out of state' subtract the DC amount from your total income and enter that amount.
DC is calculating what % of your total income is from DC to figure your DC tax.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
