Maryland Property Tax Assessment Appeal: How to Lower Your Bill in 2026

Part of: The Complete Guide to Selling a Home in Montgomery County, MD

Key Takeaways: Maryland's State Department of Assessments and Taxation (SDAT) reassesses every property on a 3-year cycle, with reassessment notices mailed in late December covering one of three groups. You have 45 days from the notice date to file a first-level appeal. If denied, you can escalate to the Property Tax Assessment Appeals Board (PTAAB), and from there to the Maryland Tax Court. The most successful appeals use comparable sales from the assessment date — not current sales — and clear evidence of condition issues. A successful appeal that reduces an assessment by $50,000 on a Montgomery County home cuts the annual tax bill by approximately $500, and the new assessment holds for the remainder of the 3-year cycle.

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If you own property in Maryland and just received an assessment that feels too high, you have a real, structured appeal right — and the data shows that owners who appeal with proper evidence win or settle favorably more than half the time. Here is the full process, deadlines, and the type of evidence that actually works.

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How Does Maryland Property Tax Assessment Work?

Maryland uses a triennial reassessment system. Every property is assessed by SDAT once every three years. The state is divided into three groups (Group 1, Group 2, Group 3), with one group reassessed each year on a rotating cycle.

Your assessment notice arrives by mail in late December, listing:

• The new assessed value (phased in over 3 years if it increased)
• The prior assessed value
• The implied annual tax change
• Instructions and deadline for appeal

Maryland uses 100% of fair market value as the assessment basis — meaning the assessment is supposed to equal what the property would sell for in an arms-length transaction on the date of finality (typically January 1 of the assessment year).

This date matters enormously for appeals. You're appealing what the property was worth on January 1 of the assessment year — not today. Many appeals fail because the owner brings current sale data instead of historical comparable sales.

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When Will My Maryland Property Be Reassessed?

Your county's SDAT page lists the next reassessment year for your property. Montgomery County properties are split across all three groups. To find your reassessment year:

1. Visit the SDAT Real Property Search
2. Look up your property by address
3. The "Assessment History" section shows the cycle

If you bought recently, the assessment notice will arrive at whichever interval falls into your group's cycle. Buyers who close in October–December commonly receive a reassessment notice within weeks of closing — and that first notice is often the most negotiable.

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What Are the Deadlines for a Maryland Property Tax Assessment Appeal?

Three appeal levels, each with a hard deadline:

1. Supervisor's Level Hearing (first-level appeal): 45 days from the date of the assessment notice. File the Petition for Review of Real Property Assessment form online or by mail with your county's SDAT office. Free.
2. Property Tax Assessment Appeals Board (PTAAB): 30 days from the supervisor's decision. Three-member board hears your appeal in person or virtually. Free.
3. Maryland Tax Court: 30 days from the PTAAB decision. Formal court with judges. Self-representation is allowed but most owners use an attorney or licensed property tax consultant at this stage. Filing fees apply.

Missing the 45-day window is the single most common reason valid appeals are lost. The notice arrives in late December; people set it aside through the holidays; February rolls around and the window has closed.

You can also file a petition out of cycle if you experience a material change in your property (fire, demolition, new construction) — but the bar is high and the process is different. The annual cycle is the primary lever.

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What Evidence Actually Wins a Property Tax Appeal?

Three categories of evidence that produce results, in order of weight:

1. Comparable sales from on or near the date of finality (January 1 of the assessment year)

Pull 3–5 sales of similar properties that closed within roughly 6 months of January 1 — ideally in the same neighborhood, same year built (±10 years), same square footage (±15%), same lot size, and same property type. Adjust for known differences (condition, finished basement, garage spaces).

Source: Bright MLS (via a licensed agent) for the most accurate historical sale data. Public records via SDAT also work but lack the condition detail. For a county-level baseline of where values actually stood at the assessment date, see Home Value in Maryland by County.

If your assessed value is higher than the median of these comparable sales, you have a strong case — and SDAT supervisors generally settle at the comp median during the first-level hearing.

2. Documented condition issues

Photos and contractor estimates for material defects that the assessor wouldn't have known about from the exterior:

• Foundation issues
• Roof needing imminent replacement
• HVAC failures
• Significant deferred maintenance
• Water damage, mold, structural issues
• Outdated kitchens/bathrooms (where comps are renovated)

The assessor uses mass-appraisal models that assume your property is in average-or-better condition for its age and area. Documented defects justify a downward adjustment.

3. Recent purchase price (if you bought at arm's length)

If you purchased the property recently in an arm's length transaction at a price below the assessment, the closing disclosure is strong evidence of market value as of the purchase date. Maryland courts have repeatedly held that a recent arm's-length sale is the best single indicator of fair market value.

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What Evidence Does NOT Win Appeals?

The bottom of the evidence pyramid — these almost never work alone:

• "My neighbor's assessment is lower." Comparable assessments aren't admissible. Comparable sales are.
• "Taxes are too high." The board can't change the tax rate, only the value.
• "I can't afford it." Hardship is a separate program (Homeowners' Property Tax Credit), not a valuation appeal basis.
• "Zillow says my home is worth less." Algorithmic estimates are not accepted as evidence at any level.
• Sales from 2026 when appealing a 2025 assessment. Wrong date is the most common preventable mistake.

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How Much Money Can a Successful Appeal Save?

Montgomery County's effective property tax rate is approximately 1.0% of assessed value (combined state + county + special districts). A successful appeal that reduces assessment by:

• $25,000 saves roughly $250/year = $750 over the 3-year cycle
• $50,000 saves roughly $500/year = $1,500 over the cycle
• $100,000 saves roughly $1,000/year = $3,000 over the cycle
• $200,000 (more common for high-end Bethesda/Potomac properties) saves roughly $2,000/year = $6,000+ over the cycle

The math: a few hours of preparation and a free hearing for $750–$6,000 in tax savings is among the best hourly returns on a homeowner's time in any year.

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Should I Hire a Property Tax Consultant?

For most Montgomery County owners with a clear comparable-sales story, no. The first-level supervisor hearing is informal, paperwork is minimal, and the supervisor's incentive is to resolve cases at the obvious comp median rather than push you to PTAAB.

Hire a consultant when:

• Your appeal involves complex commercial property
• You're appealing a property valued over $1.5M with comp issues that aren't obvious
• You've lost at the supervisor level and are escalating to PTAAB or Tax Court
• You don't have the time or comfort to prepare evidence yourself

Consultants in Maryland typically charge contingency fees of 30–50% of the first-year tax savings. For a straightforward appeal, you keep more by doing it yourself.

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What Happens After I File the Appeal?

The standard timeline:

1. Week 0: File the petition online or mail it.
2. Weeks 2–8: Receive a hearing date.
3. Hearing: 15–30 minutes, informal. You present your evidence; the assessor presents theirs. Often settled on the spot at a negotiated middle value.
4. Weeks 1–3 after hearing: Written decision arrives.
5. If reduced: New assessment applies going forward (no retroactive refund for prior years).
6. If denied or partially granted: You have 30 days to file PTAAB.

The assessor will sometimes call you before the hearing to settle at a value. This is normal and often the best outcome — accept if it's reasonable, push to hearing if not.

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What If My Property Was Reassessed Higher Than Comparable Sales?

This is the most common winning appeal in 2026.

Maryland's reassessment cycle creates timing artifacts. A property reassessed in January 2026 was valued as of January 1, 2026 — using sales data from the prior 6–12 months. If your neighborhood saw a surge in sales during 2025 followed by softening in 2026 (which is exactly what the April 2026 Bright MLS data shows for some Montgomery County submarkets — median sold price -1.5% YoY), your assessment may now sit above current market.

This is appealable next cycle, but only with appropriate-date evidence.

If you're appealing the 2026 assessment, use 2025-and-earlier comps. If your 2026 assessment is genuinely above the January 1, 2026 fair-value, the supervisor settles. If it isn't, the appeal won't win — even if 2026 values have softened since.

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Bottom Line: Appeal If You Have Comparable-Sales Evidence

The Maryland property tax appeal process is genuinely accessible, free at the first two levels, and decided on objective evidence rather than discretion. The owners who win are the ones who:

1. Open the assessment notice when it arrives in late December and check the deadline
2. Pull 3–5 comparable sales from on or near the date of finality (January 1 of the assessment year)
3. Document any material condition issues
4. File the petition within 45 days
5. Show up to the hearing with the evidence organized

If your Montgomery County (or any Maryland) home was reassessed materially above what comparable sales support, the math is straightforward: a few hours of prep can save $500–$3,000+ over the cycle.

For a current-market view of comparable sales in your specific neighborhood — the kind that holds up in a hearing — that's something a licensed local agent can pull from Bright MLS quickly. If you'd like a frank assessment of whether you have a winnable case, that's the conversation worth having before the next December notice arrives.