Maryland Property Tax Appeal Guides
Browse source-reviewed property tax appeal guides for Maryland. County deadlines, filing methods, and available records can differ by county and tax year.
Each published guide identifies the public sources used for its deadline and filing summary. Confirm current requirements with the official filing authority before submitting anything.
How Maryland assessment appeals generally work (state framework reviewed 2026-08-02 from official Maryland sources): The Maryland State Department of Assessments and Taxation determines full cash or market value under a triennial reassessment system. Increases are generally phased into the taxable assessment in equal increments over three years, while decreases are reflected without an upward phase-in. A property owner begins with the local State Department of Assessments and Taxation office and a supervisor-level hearing. The Department's decision may be appealed to the independent Property Tax Assessment Appeal Board for the county or Baltimore City, followed by the Maryland Tax Court and then authorized judicial review.
Maryland deadline framework: A reassessment-notice appeal is generally due within 45 days of the notice date. An appeal from the Department's decision to the Property Tax Assessment Appeal Board is generally due within 30 days of the decision, and a Maryland Tax Court appeal is generally due within 30 days of the board's order or notification. Purchase, petition-for-review, supplemental, and other assessment types use different triggers.
Local variation in Maryland: SDAT administers assessment statewide through local offices, while independent appeal boards serve each county and Baltimore City. Jurisdictions are on different triennial reassessment cycles, and purchase appeals, petitions for review, agricultural use, exemptions, credits, and phase-in calculations require separate checks.
Before relying on a date: Resolve the county or Baltimore City, reassessment group, valuation and tax years, notice or decision date, assessment type, and phase-in history, then verify the current SDAT filing method, supervisor decision, local appeal-board deadline and hearing, Maryland Tax Court instructions, and any later judicial-review requirement before presenting filing guidance.
State source: Maryland State Department of Assessments and Taxation, Assessment Appeal Process, https://dat.maryland.gov/realproperty/Pages/Assessment-Appeal-Process.aspx. Reviewed 2026-08-02.
State source: Maryland State Department of Assessments and Taxation, Real Property Assessment Appeal Form, https://assessmentappeals.dat.maryland.gov/start.aspx. Reviewed 2026-08-02.
State source: Maryland Property Tax Assessment Appeal Boards, Property Tax Assessment Appeal Boards Frequently Asked Questions, https://ptaab.maryland.gov/Pages/FAQs.aspx. Reviewed 2026-08-02.
Montgomery County: 2026 deadline guidance is 45 days from the assessment notice date. Guide: https://fairpath.app/property-tax-appeal/maryland/montgomery-county
Prince George's County: 2026 deadline guidance is 45 days from the assessment notice date. Guide: https://fairpath.app/property-tax-appeal/maryland/prince-georges-county
Source: Maryland Department of Assessments and Taxation, Assessment Appeal Process, https://dat.maryland.gov/realproperty/Pages/Assessment-Appeal-Process.aspx. Reviewed 2026-10-17.
Source: Maryland Department of Assessments and Taxation, Homeowner's Guide to Property Tax, https://dat.maryland.gov/realproperty/pages/homeowners-guide.aspx. Reviewed 2026-10-17.
Source: Maryland Department of Assessments and Taxation, Montgomery County Reassessment Areas, https://dat.maryland.gov/realproperty/Pages/Montgomery-County-Reassessment-Areas.aspx. Reviewed 2026-10-17.
Source: Maryland Department of Assessments and Taxation, Petition for Review or New Owner Appeal, https://dat.maryland.gov/Documents/Accessible%20Documents/Real%20Property%20Miscellaneous%20Forms/Petition%20for%20Review%20or%20New%20Owner%20Appeal%20of%20Real%20Property_0726-A.pdf. Reviewed 2026-10-17.
Source: Maryland Department of Assessments and Taxation, Prince George's County Reassessment Areas, https://dat.maryland.gov/realproperty/pages/prince-georges-county-reassessment-areas.aspx. Reviewed 2026-10-17.
Source: Maryland Department of Assessments and Taxation, Property Owner's Bill of Rights, https://dat.maryland.gov/realproperty/Pages/Bill-of-Rights.aspx. Reviewed 2026-10-17.
Source: Maryland Department of Assessments and Taxation, Questions and Answers About Real Property Assessments, https://dat.maryland.gov/realproperty/Pages/Questions-and-Answers-About-Real-Property-Assessments.aspx. Reviewed 2026-10-17.
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