You are correct. Working remotely does not affect the state you pay taxes to. As it sounds like most of your income is sourced to PA, you will still need to file in PA as a nonresident.
You will then be able to claim a credit on your resident DE return as a credit for taxes paid to another state.
PA filing requirement
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
