Filing and paying your taxes Filing and payment methods, instructions, interest rates, and penalties related to City of Philadelphia taxes. How to file and pay City taxes Instructions for filing and paying your taxes online, by phone, in person, by mail, and through Modernized e-Filing. Make an appointment to pay City taxes or a water bill in person How to schedule an appointment to pay a bill, or other City fee, in person at the Municipal Services Building (MSB). Use Modernized e-Filing (MeF) for City taxes Vendors that allow you to e-file your City taxes. Interest, penalties, and fees Current interest rates, penalty amounts, and fees that the City applies to late tax returns and delinquent payments.