md resident works in pa how does that affect my taxes?

Answer 1

If you are self employed you will have to pay PA taxes and take a credit against your MD tax for taxes paid to PA.
If you are an employee PA and MD have reciprocity and your wages are not subject to PA withholding and you would not have to file a PA return.

Answer 2

best bet is to ask your HR rep. or if you have a local tax place or H&R block and see if they give any free advice, or try H&R Block online.