WATCH: How To Appeal Your Home’s New Tax Valuation

The City of Philadelphia says:

If you think the new assessed value of your property is incorrect, you can request a first-level, informal review by the Office of Property Assessment (OPA). To start the first-level review process, you must:

Complete and submit the First-Level Review Request form (which will be included in the February 2013 Assessment Change Notice mailing) and include any additional information for the OPA to consider, such as photos or recent appraisals, by March 31, 2013.
Based on the submitted information, the Evaluator may decrease, increase or keep the assessed value the same.

If you are not satisfied with the outcome of the first-level review, you may still file an appeal with the Board of Revision of Taxes (BRT). Formal appeals are due to the BRT by the first Monday in October 2013 (October 7, 2013).

The OPA offers a list of Frequently Asked Questions about the its processes here.