Maryland Property Tax Appeal Guide

What This Data Tells Us About Appeals in Maryland

In Maryland, property tax appeals are filed with the Property Tax Assessment Appeals Board (PTAAB). The typical window is Within 45 days of the assessment notice, with the deadline most commonly falling in February. Filing fees reported for this state are $0, and Lincoln Institute research plus state-reported data suggest roughly 50% of appeals result in some reduction when supported by comparable sales or documented errors.

Maryland reassesses one-third of properties each year (triennial cycle). Phase-in provisions spread value increases over three years. Appeals are driven by the gap between a parcel's assessed value and its actual market value — the calculator below turns that gap into an annualized dollar figure at your effective tax rate. The strongest evidence is three to five arms-length comparable sales from the past six to twelve months, plus documentation of any factual errors in the assessor's record (square footage, bedroom count, finished-basement status).

This guide is for informational purposes only and is not legal or tax advice. Deadlines, filing fees, success rates, and procedures vary by county within Maryland and can change year to year. Always verify the current rules with your local assessor's office — or a licensed attorney or tax professional — before filing. Source: Maryland State Department of Assessments and Taxation.