Maryland property tax appeals
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Maryland reassesses your home every three years at fair market value, and about a third of homes get a new notice each year. If you get a notice, you have 45 days to appeal; if you do not, you can file a petition for review by early January. An appeal makes sense when recent sales show your value is too high, not just because your bill went up.
- You got a new assessment notice and recent comparable sales show the value is above what your home would sell for. File within 45 days of the notice date.
- SDAT's record has an error in your home's size, condition, or features.
- You did not get a new notice, but your value looks too high. File a petition for review before the first workday in January.
- Your bill went up but your assessed value is fair. A higher bill often comes from the tax rate, not the assessment.
- You have no market evidence. The appeal reviews your home's value, not the size of your bill.
Read the full explanation
In Maryland, the State Department of Assessments and Taxation (SDAT) values every home at its fair market value and reassesses once every three years, so about one third of homes get a new notice each year. If you think your value is too high, you appeal, first to your local Supervisor of Assessments, then to the Property Tax Assessment Appeal Board, then to the Maryland Tax Court. If you got a new assessment notice, you have 45 days from its date to appeal. If you did not get a new notice this year, you can still file a petition for review before the first workday in January. An appeal helps when recent sales show your value is too high or the record has an error. It will not help just because your tax bill went up, since a higher bill can come from the tax rate, not your value. This is general information, not tax advice.
Source: Maryland State Department of Assessments and Taxation · checked 2026-07-16. We're publishing verified county filing facts as each review is completed. Automated assessment checks will follow our rollout schedule.
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