Your Maryland county is
collecting more than it should.
Maryland assesses property at 100% of full cash value on a triennial cycle — but errors accumulate and compound for years. You have only 45 days from your Notice of Assessment to file a PTAAB appeal.
Average Maryland homeowner overpayment: $920/year — that's $77/month.
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Maryland PTAAB Deadline — 45 Days from Notice
Maryland homeowners receive a Notice of Assessment on a triennial (3-year) cycle. You must file an appeal with the local Property Tax Assessment Appeal Board (PTAAB) within 45 days of the notice date using Form TC-100. Miss it and you cannot appeal until the next reassessment cycle — up to 3 years away.
All 24 Maryland Counties
Select your county to see your local tax rate, average overpayment, and filing options.
Why Maryland Homeowners Are Getting Overcharged
Maryland law requires all real property to be assessed at 100% of full cash value (fair market value) under § 8-105 of the Tax-Property Article. But county assessors conduct these reviews only once every three years — and a single inflated assessment locks in an error for the entire triennial cycle.
Because Maryland reassesses on a 3-year triennial cycle, an overassessment is not just a one-year problem. If your value is set too high in year one, you overpay in years one, two, and three — and must wait until the next reassessment notice to get relief. A $60,000 overassessment at a 1.2% rate costs you over $2,100 before the next review.
The appeal process runs through the local Property Tax Assessment Appeal Board (PTAAB). Adverse PTAAB decisions can be escalated to the Maryland Tax Court, and then to Circuit Court. Most disputes are resolved at the PTAAB level within 90 days. Fairmark handles all filings using Form TC-100 for $79 flat.
Maryland is a free public records state — assessment data is available without charge. That means Fairmark can check your actual assessment against comparable sales the same day you ask. No waiting, no estimates.
Important: Your assessment can only go down from an appeal
Filing a PTAAB petition in Maryland cannot raise your assessment. The Board reviews evidence for a reduction — never an increase. There is zero risk to checking and filing.
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How Maryland Property Tax Appeals Work
- 1
Receive your triennial Notice of Assessment
Maryland's State Department of Assessments and Taxation (SDAT) mails a Notice of Assessment to each property owner once every three years. It shows your property's assessed value and the effective date. This is your window to act.
- 2
File a PTAAB appeal within 45 days using Form TC-100
You have 45 days from the notice date to file an appeal with the local Property Tax Assessment Appeal Board (PTAAB). Form TC-100 is the standard petition. Fairmark handles all filings on your behalf — you sign once and we handle the rest.
- 3
Present evidence at your PTAAB hearing
The PTAAB reviews your evidence — comparable sales, independent appraisals, or market analysis — against the assessor's value. Hearings are typically scheduled within 90 days. Fairmark prepares and presents all documentation to support a reduction.
- 4
Lock in a lower assessment for the full triennial cycle
If the appeal succeeds, your assessed value is reduced for the current assessment period. Because Maryland reassesses every three years, a successful appeal locks in your lower value — and lower tax bill — for up to three years.
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