"Every person desiring to engage in or to continue to engage in any business within the City of Philadelphia shall, whether or not such person maintains a place of business in the City, prior to engaging in such business, procure a Commercial Activity License from the Department of Licenses and Inspections."

-Philadelphia Code § 19-2602.

A Commercial Activity License is required in order to conduct business within the City of Philadelphia. To obtain a Commercial Activity License, you will be required to provide your City of Philadelphia Tax Account Number which can be obtained from the Department of Revenue.