How to Appeal Your Property Tax in Maryland: Step-by-Step Guide

How Property Tax Appeals Work in Maryland

Maryland property owners pay some of the highest property taxes in the country. The state’s median effective property tax rate sits near 1.07%, and in counties like Howard, Montgomery, and Baltimore County, annual tax bills on a median-priced home routinely exceed $4,000. If your assessment seems inflated — and many are — you have a legal right to challenge it. The appeal process in Maryland is structured, time-sensitive, and tilted toward homeowners who come prepared with hard data.

This guide breaks down every stage of the Maryland property tax appeal process, from understanding how the State Department of Assessments and Taxation (SDAT) values your property to filing at the Maryland Tax Court. If you believe your home’s assessed value exceeds its fair market value, or that comparable properties in your neighborhood are assessed lower, this is your roadmap to a reduced tax bill. For background, read our guide: Maryland property tax system explained.

How Maryland Assesses Property Value

Maryland operates on a triennial assessment cycle. Every property in the state is reassessed once every three years, with properties divided into three groups. Each group is reassessed on a rotating basis, so roughly one-third of all properties receive new valuations each year.

The reassessment date is always January 1 of the assessment year. SDAT mails assessment notices to property owners in late December or early January. The notice shows your property’s current value, new full cash value, and the phased-in assessment that will be used for tax calculations.

Maryland uses a phased-in assessment system for increases. If your property’s assessed value goes up, the increase is spread equally over three years rather than applied all at once. For example, if your home’s value increases by $60,000 in a reassessment, your taxable assessment rises by $20,000 per year for the next three years. Decreases, however, take effect immediately — there is no phase-in for reductions.

SDAT assessors use a mass appraisal approach. They analyze recent sales data, building permits, property characteristics, and market trends to estimate fair market value. While this system works reasonably well for cookie-cutter subdivisions, it frequently produces questionable results for unique properties, older homes with deferred maintenance, or neighborhoods with limited recent sales. Use the property tax calculator to estimate how a changed assessment would affect your annual bill.

When to Appeal: Grounds That Actually Work

Not every high assessment warrants an appeal. Before investing time in the process, evaluate whether you have a legitimate case. Appeals succeed most often on these grounds:

Overvaluation: Your property’s assessed value exceeds what it would sell for on the open market. This is the most common and most successful basis for appeal. You need recent comparable sales — properties similar in size, age, condition, and location that sold for less than your assessed value.

Lack of uniformity: Similar properties in your immediate area are assessed at lower values. Even if your assessment accurately reflects market value, you may have a case if neighbors with comparable homes pay less. Maryland law requires uniform assessment within jurisdictions.

Errors of fact: SDAT has incorrect information about your property. Common errors include wrong square footage, incorrect lot size, extra bathrooms or bedrooms that don’t exist, a finished basement listed when yours is unfinished, or an incorrect year of construction. These errors are often the easiest to prove and correct.

Condition issues: Your property has physical problems — foundation damage, water intrusion, outdated systems, environmental contamination — that the assessor didn’t account for. Structural deficiencies, necessary roof replacement, or significant deferred maintenance can all reduce market value below assessed value.

Step 1: Review Your Assessment Notice

When you receive your assessment notice (typically late December or early January), examine every detail. SDAT maintains property records online through their Real Property Search tool. Pull up your property and verify:

• Total living area (square footage)
• Lot size
• Number of bedrooms and bathrooms
• Year built
• Quality grade and condition rating
• Building style and construction type
• Basement type (finished vs. unfinished)
• Outbuildings, garages, pools, or other improvements

Any factual error gives you an almost guaranteed basis for adjustment. Even small discrepancies in square footage can translate to thousands of dollars in assessed value. If your home is listed at 2,400 square feet but actually measures 2,150, that 250-square-foot difference could mean $25,000 to $50,000 in inflated value depending on your market.

Step 2: Gather Comparable Sales Data

Comparable sales are the foundation of any property tax appeal. You need recent sales of properties similar to yours that sold for less than your assessed value. Effective comparables share these characteristics with your property:

• Within 1 mile (closer is better, same neighborhood is ideal)
• Sold within the last 6-12 months of the assessment date
• Similar square footage (within 10-15%)
• Same general age and construction type
• Comparable lot size
• Similar bedroom/bathroom count
• Comparable condition and quality grade

Sources for comparable sales data include SDAT’s own online records, Maryland land records (available through county circuit court websites), and MLS data if you work with a real estate agent. Aim for 3-5 strong comparables. For each comparable, note the sale price, sale date, property characteristics, and any differences from your property that would justify an adjustment.

If you’re unfamiliar with how property valuation works in the context of purchasing, the home buying guide covers appraisal fundamentals. Understanding how buyers and appraisers evaluate properties will strengthen your appeal preparation.

Step 3: File the Petition — The 45-Day Window

Maryland gives property owners 45 days from the date of the assessment notice to file an appeal. This deadline is firm. Miss it, and you wait until the next reassessment cycle — potentially three years.

The first level of appeal is an informal review with your SDAT supervisor. You can request this by contacting the local SDAT assessment office for your county. This step is optional but recommended. It’s a conversation, not a hearing, and supervisors have the authority to make adjustments on the spot if you present credible evidence. Many homeowners resolve their disputes at this level without proceeding further.

If the supervisor review doesn’t resolve the issue, you file a formal appeal with the Property Tax Assessment Appeals Board (PTAAB) for your county. Maryland has 24 local PTAAB offices, one for each county plus Baltimore City. The appeal form is available on the SDAT website and requires basic information about your property, your opinion of value, and the basis for your appeal.

There is no filing fee for a PTAAB appeal. You can represent yourself — no attorney is required at this level, and most homeowners handle it without legal representation.

Step 4: Prepare for the PTAAB Hearing

The PTAAB hearing is a semi-formal proceeding. You’ll present your case to a panel of appointed board members. The hearing typically lasts 15-30 minutes. Here’s how to prepare:

Organize your evidence packet. Bring at least three copies of everything — one for you, one for the board, and one for the SDAT representative. Your packet should include:

• A summary sheet stating your current assessment, your opinion of value, and the basis for your appeal
• Comparable sales data with photographs, property details, and sale prices
• A comparison chart showing how each comparable relates to your property
• Photographs of your property, especially any condition issues or features that reduce value
• Any repair estimates, inspection reports, or contractor quotes that document property deficiencies
• A copy of your property record from SDAT, annotated with any errors

Practice your presentation. You have limited time. Lead with your strongest evidence. State your current assessment, your opinion of fair market value, and explain why the comparable sales support your position. Don’t ramble about tax burdens or neighborhood complaints — stick to property value evidence.

Anticipate SDAT’s response. The SDAT assessor will attend the hearing and may present their own comparable sales supporting the current assessment. Be prepared to explain why your comparables are more relevant — closer proximity, more recent sales, greater physical similarity to your property.

Step 5: The Maryland Tax Court (If Needed)

If the PTAAB decision is unfavorable, you can appeal to the Maryland Tax Court. This is a formal judicial proceeding. You must file within 30 days of the PTAAB decision.

The Maryland Tax Court appeal involves a filing fee and a more formal evidentiary process. At this level, many homeowners retain an attorney or a professional property tax consultant. The court conducts a de novo review — meaning it considers the case fresh, not limited to the evidence presented at the PTAAB level. You can introduce new evidence, call witnesses, and present expert testimony.

For properties with high assessments — particularly commercial properties or expensive residential properties where the potential tax savings justify the cost — hiring a property tax attorney or appraiser for the Tax Court appeal is a reasonable investment. Attorney fees for Tax Court appeals typically range from $1,500 to $5,000 for residential properties, though contingency arrangements (where the attorney takes a percentage of tax savings) are also common.

The Homestead Tax Credit: Automatic Protection Against Spikes

Even if you don’t appeal, Maryland’s Homestead Tax Credit provides automatic protection against large assessment increases. The credit caps the annual increase in your property’s taxable assessment at 10% or less, depending on your county. Many jurisdictions set their cap well below 10% — Baltimore City caps increases at 4%, Howard County at 5%, and several other counties have adopted reduced caps.

The Homestead Tax Credit applies only to your primary residence. You must apply once through SDAT, and once approved, the credit continues automatically. If you haven’t applied, you should — there’s no downside, and it prevents assessment spikes from translating into immediate tax increases. For full details on applying, see the property tax calculator page, which includes Maryland-specific rate information.

Note that the Homestead Tax Credit limits the rate at which your assessment can increase for tax purposes. It doesn’t cap the tax rate itself. If your county raises its property tax rate, your bill can still increase even with the Homestead Credit in place.

What a Successful Appeal Looks Like: Real Numbers

Consider a homeowner in Anne Arundel County whose property is reassessed at $450,000, up from $380,000. The combined property tax rate in their jurisdiction is approximately $1.10 per $100 of assessed value. At the new assessment, their annual tax bill would be approximately $4,950. If they successfully appeal and reduce the assessment to $400,000, the annual bill drops to $4,400 — a savings of $550 per year, or $1,650 over the three-year assessment cycle.

For homeowners in higher-tax jurisdictions like Baltimore County or Montgomery County, the savings from a successful appeal can be substantially larger. A $50,000 reduction in assessed value in Montgomery County, where combined rates approach $1.20 per $100, saves roughly $600 annually — $1,800 over the assessment cycle.

These savings compound. A reduced assessment in one cycle becomes the baseline for the next cycle. If your home’s market value genuinely hasn’t increased, a successful appeal can save thousands over a decade. The mortgage calculator can help you see how property tax changes affect total monthly housing costs.

Common Mistakes That Sink Property Tax Appeals

Using Zillow estimates as evidence. PTAAB boards and the Tax Court do not consider automated valuation models (AVMs) like Zestimates as reliable evidence of market value. Use actual comparable sales.

Choosing poor comparables. A comparable sale from 5 miles away in a different school district is not comparable. A teardown sale is not comparable to your maintained home. Select comparables that a reasonable buyer would consider alternatives to your property.

Arguing about tax rates instead of value. The appeals process addresses assessed value, not tax rates. Complaining that taxes are too high or that the county spends money unwisely is irrelevant. Your only question is whether the assessed value exceeds fair market value.

Missing the deadline. The 45-day window is non-negotiable. Mark your calendar when you receive your assessment notice. Late filings are rejected without exception.

Failing to document property condition. If your home has a cracked foundation, an aging roof, or outdated electrical systems, bring photographs and repair estimates. Assessors evaluate properties from the outside and from public records — they may not know about interior problems that reduce value.

Should You Hire a Professional?

For most residential property tax appeals at the PTAAB level, homeowners can handle the process themselves. The hearing is designed to be accessible to non-lawyers, and the evidence needed — comparable sales and property data — is publicly available.

Consider hiring a property tax attorney or consultant if:

• Your property’s assessed value exceeds $750,000
• You’re appealing to the Maryland Tax Court
• The property has complex valuation issues (mixed-use, unique construction, environmental problems)
• You’ve already lost at the PTAAB level and want professional guidance for the next step
• The potential tax savings justify the cost (most professionals charge 25-40% of first-year savings or a flat fee of $500-$3,000 for residential appeals)

Property tax consultants in Maryland are not licensed or regulated, so check references and confirm their track record with the specific PTAAB where your appeal will be heard. Attorneys who specialize in property tax law are a safer choice for Tax Court proceedings. Before hiring anyone, review your county’s closing cost breakdown to understand how property taxes fit into overall homeownership expenses.

After the Appeal: What Happens Next

If your appeal succeeds, SDAT adjusts your assessment and your tax bill is recalculated. If you’ve already paid taxes based on the higher assessment, you’ll receive a refund or credit. The reduced assessment remains in effect until the next triennial reassessment, at which point SDAT will reevaluate your property based on current market conditions.

If your appeal fails at the PTAAB level, you have 30 days to appeal to the Maryland Tax Court. If you choose not to pursue a further appeal, your current assessment stands until the next reassessment cycle. You can — and should — appeal again at the next reassessment if the same issues persist.

Keep your evidence organized and updated. Comparable sales data, property photographs, and condition documentation should be refreshed with each reassessment cycle. The work you do for one appeal makes future appeals faster and more effective.

For first-time buyers in Maryland who are still evaluating whether to purchase, understanding the property tax appeal process is part of calculating true homeownership costs. The affordability calculator factors in property taxes, and knowing you can challenge an inflated assessment adds a layer of financial control. Maryland also offers several first-time homebuyer programs that can offset initial costs.

Frequently Asked Questions

Can my assessment increase as a result of filing an appeal?

Yes. Maryland law permits the appeals board to raise, lower, or maintain your assessment. In practice, increases resulting from appeals are uncommon, but the risk exists. If your property’s market value clearly exceeds your current assessment, filing an appeal could draw attention to the undervaluation. Evaluate your case honestly before filing.

How long does the entire appeal process take from start to finish?

A supervisor review can be resolved in one to two weeks. PTAAB hearings are typically scheduled within one to three months of filing. If you appeal to the Maryland Tax Court, expect six to twelve months. The full process from initial filing through Tax Court resolution can take over a year, though most residential appeals are resolved at the PTAAB level within a few months.

Do I still have to pay my property taxes while the appeal is pending?

Yes. Maryland requires property owners to continue paying taxes based on the current assessment while an appeal is pending. If the appeal results in a lower assessment, you will receive a refund or credit for any overpayment. Do not withhold tax payments during the appeal process — doing so can result in penalties, interest, and potential tax sale proceedings.

Can I appeal my property tax assessment if I just bought my home?

Yes, and a recent purchase is actually strong evidence for an appeal. If you purchased your home through an arm’s-length transaction for less than the assessed value, the sale price is direct evidence of market value. Bring your settlement statement and purchase contract to the hearing. This is one of the strongest possible forms of evidence in a property tax appeal. Review the selling process guide for context on how sale prices are established and documented.

Is there any way to reduce my property taxes without filing a formal appeal?

Maryland offers several property tax relief programs beyond the appeal process. The Homestead Tax Credit caps assessment increases for primary residences. The Homeowners’ Tax Credit provides income-based property tax relief for qualifying homeowners. Senior citizens may qualify for additional credits depending on their county. These programs are administered by SDAT and your county government. You should apply for every credit and exemption you qualify for — they work independently of the assessment appeal process.