(I'm assuming you were a resident of PA for all of 2015, and that DC was your only out-of-state income source.)
In order to make TurboTax work properly when you work in a reciprocal state, you must answer No in the TT Personal Info section to the question about earning income in another state. That's because, due to reciprocity, the wages you earned in DC are - for tax purposes - considered PA income.
DC has reciprocity with every state. If you work in DC and are a resident of any other state, you do not have to pay DC income tax on your wages. But those same wages ARE taxable in your home state.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
