Your basis in your retirement plan, for PA income tax purposes, is the sum of all your contributions less the sum of any distributions taken in previous years.
You do not count any employee matching or any earnings in the basis.
Essentially, in the case of an early distribution (box 7 coded 1), you get your contributions back first, then any employer matching and earnings are taxable.
You may have to ask your plan administrator for the above figures, though some plans list your contribution total on the periodic statements you may have received.
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