If I just moved to Norristown,Pa, and I work in Plymouth Meeting,PA which taxes do I pay?

I looked at my paycheck and it says ''Plymouth Twp Income Tax'', My employer also gave me a Residency Certification Form which I still have to fill out. Isn't all the taxes taken out of my paycheck or is that what the Residency form is? I thought that you only had to pay for the town you... show more I looked at my paycheck and it says ''Plymouth Twp Income Tax'', My employer also gave me a Residency Certification Form which I still have to fill out.

Isn't all the taxes taken out of my paycheck or is that what the Residency form is? I thought that you only had to pay for the town you worked in. Please explain in simple form, I am really new at this sadly.
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