Your Baltimore Property Tax Assessment Went Up. Here's How to Fight It Before You Overpay.

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SDAT mails each reassessment cycle's notices in late December. The 2026 notices (Group 2) went out last winter, so that window has closed. Group 3 owners in Baltimore City and Baltimore County are next, with notices expected at the end of December 2026.

I am Ed Drost, a Maryland State Certified Residential Appraiser (License #30004874) with 37 years of experience appraising homes across the Baltimore region. I also prepare SDAT appeal valuations, so I will tell you plainly when an appraisal is worth the fee and when it is not.

Why did my assessment go up when I didn't change a thing?

You open the notice and your house is worth $75,000 more than three years ago. No new kitchen, no new bath, not even a new deck.

Often that is simply the market. Buyers competed, rates moved, and neighborhood sales reset expectations. SDAT's 2026 Group 2 reassessment found values up in all 23 counties and Baltimore City, with 92.7% of Group 2 residential properties rising.

But a higher number is not proof of a wrong number. In 37 years of appraising, I have seen two houses on the same block carry very different market values because of condition, layout, renovations, site, or location. A statewide mass-appraisal model cannot see the water in your basement or the easement across your back lot.

So the only question that matters is this: is the state's estimate supported by what buyers would actually pay for your home?

Assessment vs. tax bill: what you are actually appealing

An appeal changes the state's estimate of market value. It does not touch the tax rate. Four numbers stack up to your bill:

• Market value: SDAT's estimate of what your property is worth. This is the number you appeal.
• Assessed value: the value after Maryland's three-year phase-in. A reassessment increase is spread evenly over three years.
• Taxable assessment: the figure the rate is applied to, after credits such as the Homestead cap.
• Tax bill: taxable assessment times the combined state, county or city, and any local rates.

The Homestead Property Tax Credit limits yearly growth in the taxable assessment of an owner-occupied principal residence. For the tax year that began July 1, 2026, SDAT lists the cap at 4% for both Baltimore City and Baltimore County. The City has reportedly moved to raise its cap to 5% beginning in fiscal 2028, so confirm the current figure with SDAT. The credit is not automatic: you must have applied once.

The cap does not limit your market value. A 20% jump in estimated value does not mean a 20% jump in your bill, but a wrong market value still follows you into future years.

When does your property get reassessed?

Maryland reassesses every property once every three years, with one-third of the state done each year. SDAT calls the cycles groups; in Baltimore City and Baltimore County you will also see them called areas.

Your group depends on your property's official reassessment area, not your ZIP code. A home in Towson and one in Parkton can land in different groups. Look yours up on SDAT's real property search before you plan around any date.

If your notice is dated December 30, 2026, day 45 is February 13, 2027. Your deadline is the date printed on your own notice, not the day it arrives or the day you open it.

Five signs your assessment is too high

1. The state's record is wrong. Check the worksheet for finished basement area, bathroom count, square footage, or features your home does not have. A wrong description produces a wrong value.
2. Comparable homes sold for less. If SDAT says $425,000 and truly competing homes sold for $370,000 to $395,000, look closer. But compare like with like: a renovated home with off-street parking will outsell a similar house that needs work.
3. Deferred maintenance. Foundation problems, water intrusion, failing mechanical systems and similar defects affect value. Photos, contractor estimates and inspection findings help, though not every repair dollar becomes a value dollar. What counts is how the market reacts.
4. A site or location problem. A pipeline or utility easement, limited access, a steep or partly unusable lot, flood concerns or heavy road noise can each pull value down. The market evidence has to show it.
5. Condition differences the model misses. Two Canton rowhouses can look identical on paper. One has a rooftop deck, new interiors and parking; the other needs everything. Buyers will not pay the same for both, and your appeal has to explain why.

What a successful appeal could save: City vs. County

The same $65,000 value correction is worth very different money depending on where the house sits. Both columns assume SDAT estimated $475,000 and the market supports $410,000. These are illustrations, not appraisal findings or promises.

The math is $65,000 × 0.0236 for the City and $65,000 × 0.01212 for the County.

Treat those as ceilings. Maryland phases a reassessment in over three years, the Homestead cap can limit the taxable increase, and rates change. The City has also announced homeowner rate reductions, so check your current bill. A smaller first-year saving is normal; the value you establish now keeps working in later cycles.

How to appeal your Baltimore assessment in 7 steps

1. Find your notice. Note the new market value, the notice date, and the control numbers. File online at SDAT's appeal portal or return the paper form to your local assessment office.
2. Check the public record. Search your property on SDAT's real property search and compare building description, above-grade area, bathrooms, basement and land against what physically exists.
3. Request the worksheet and area sales. Ask the Supervisor of Assessments for the property worksheet and the comparable sales SDAT used. Fees can apply at later appeal levels, so ask when you request them.
4. Know your valuation date. SDAT values your property as of the January 1 date of finality, the January 1 before the July 1 tax year the new value starts. For the 2027 Group 3 cycle that is January 1, 2027. Evidence close to that date carries the most weight, and Maryland's highest court has allowed comparable sales shortly after it.
5. Pick comparables that truly compete. Match location, type, size, condition and features. The best comps are not the three cheapest sales in the neighborhood; they are the ones that show what buyers pay for a home like yours.
6. Organize your evidence. Comparable sales with addresses, dates and prices, the worksheet, photos, contractor estimates, corrected property facts, easement documents, and an appraisal when the dollars justify it.
7. File on time, then escalate if needed. The first level is the Supervisor's appeal, which can be handled in writing or at a hearing. If you disagree with the final notice, appeal to the Property Tax Assessment Appeal Board within 30 days. A further appeal to the Maryland Tax Court is available within 30 days of the board's order.

Local examples of how I think about comps: in Canton, match rowhouses by renovation level and parking. In Towson, match style, age and location influences. In Parkton or Hereford, weigh usable acreage and site access. In Pikesville or Owings Mills, account for updates and competing subdivisions.

For residential property, SDAT's own procedure manual says the value may not be raised because of information learned at your appeal hearing.

What if you missed the 45-day deadline?

You may still have a route, but it points at a later tax year, not the one you missed.

• Petition for Review. In the two years between reassessments, you can petition for a new valuation. The petition may be filed as late as the first working day after January 1, and the property is then valued as of that new January 1 date. It is meant for value changes since the last assessment, and it is not a substitute for appealing a notice you already received.
• New-owner appeal. If the property transferred between January 1 and June 30, the new owner generally has 60 days from the transfer date to appeal, if the requirements are met.

Do not assume any missed deadline can be reopened. Confirm which procedure fits your property and which tax year it can change.

What wins, what doesn't, and when an appraisal is worth paying for

A winning appeal reads like a market-value argument, not a complaint about taxes. Here is the difference:

These arguments feel right but do not prove the value is wrong:

• "My assessment rose 25%." An increase alone is not an error.
• "I haven't improved anything." Markets rise without renovations.
• "My neighbor pays less." Credits, cycles and phase-in explain most differences between bills.
• "The city won't fix my street." Services and spending do not set market value.
• "An online estimate says it's worth less." Automated estimates are context, not evidence.

You may not need an appraisal. If the gap is small and the facts are simple, such as a wrong square footage or a few clear comps, you can prepare the appeal yourself.

An appraisal earns its fee when the dollars are large, the property is unusual, or the value rests on professional judgment: custom or older homes, serious deferred maintenance, acreage, easements, or land-use limits. A hired appraiser does not guarantee a reduction, and the report must be built for the right valuation date and the right purpose. Settle the date, intended use and scope before you order one. This is the work I do, including SDAT tax appeals, estate and probate, and divorce valuations, so I will tell you plainly whether an appraisal makes sense for your numbers.

Frequently asked questions

How long do I have to appeal?

Generally 45 days from the date printed on your SDAT reassessment notice. Petitions for review, new-owner appeals, and later appeal levels have their own deadlines.

What does it cost to file?

I know of no SDAT fee to file a regular appeal, but confirm on SDAT's site. Worksheet copies can carry a reasonable fee at later levels, and an independent appraiser charges separately.

Can I appeal online?

Yes. Use SDAT's appeal portal with the control numbers on your notice.

Does it work the same in Baltimore City and Baltimore County?

Yes. SDAT runs the process statewide; your appeal goes to the assessment office for your property's location.

Do I need an appraisal?

No. Corrected records and good comparable sales can be enough. An appraisal helps in harder cases.

Can my value rise just because I appealed?

For residential property, SDAT's procedure manual says the value may not be increased as a result of information learned at your appeal hearing.

Will winning cut my bill dollar for dollar?

Not necessarily. Phase-in, the Homestead cap, credits and rates all sit between value and bill.

What if I lose at the first level?

Appeal to the Property Tax Assessment Appeal Board within 30 days of the Supervisor's final notice, then to the Maryland Tax Court within 30 days of the board's order.

Are there other tax relief programs?

Yes. The Homestead credit and the income-based Homeowners' Property Tax Credit are separate from a value appeal, and you may qualify for more than one.

Before you pay more, make sure the value is right

A fair assessment is the goal, not the lowest possible number. Pull your records, test the comparable sales, and mark your deadline the day the notice arrives.

If you want an honest read on whether an appraisal would pay for itself on your property, call me at 443-904-5229 before you file.

Sources

• SDAT 2026 Group 2 reassessment release
• SDAT 2026-2027 tax rates and Homestead caps
• Baltimore City real property tax rate
• Property Tax Assessment Appeal Board FAQ
• SDAT assessment procedure manual: petitions for review.aspx?LID=163)
• Maryland fiscal note: notice timing and appeal deadlines
• SDAT assessment appeal process
• SDAT tax credit programs

An appraisal is an independent opinion of market value. It does not guarantee an SDAT appeal outcome or a tax reduction. This article is general information, not legal or tax advice. Deadlines and tax treatment depend on your circumstances, so verify current requirements with SDAT or a qualified professional. Last reviewed October 30, 2026.

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