Maryland Property Tax Reassessment: Complete 2026 Guide for Southern MD Homeowners

Your Maryland property tax reassessment notice for 2026 may already be in your hands. Group 2 properties (Charles, Calvert, and St. Mary’s counties) were reassessed as of January 1, 2026, with notices mailed at the end of December 2025. Statewide, residential properties increased an average of 13.2%. In Southern Maryland, the official SDAT numbers by county are: Charles County saw a 12.5% residential increase, St. Mary’s County came in at 10.7%, Calvert County at 9.0%, and Prince George’s County at 10.3%, per the official SDAT January 2026 reassessment report. Those headline numbers sound large, but a higher assessed value does not automatically mean an equally large jump in your annual tax bill. Maryland has a phase-in system and, for owner-occupied homes, a Homestead Tax Credit that caps how much your taxable assessment can rise each year. This guide explains how the Maryland property tax reassessment system works, what the 2026 numbers actually mean for your bill, and how to file an appeal if you believe your assessed value is too high. For a detailed walkthrough of every step, deadlines, and evidence that wins, see the Maryland property tax appeal guide.

How Maryland Property Tax Reassessment Works

Maryland divides all property accounts into three groups and reassesses one group each year on a three-year cycle. Group 2, which covers Charles, Calvert, and St. Mary’s counties along with several others, was the focus of the 2026 cycle. The State Department of Assessments and Taxation (SDAT) evaluated 789,178 residential and commercial properties based on recent sales data and market conditions as of January 1, 2026.

The new assessed value is intended to reflect what your property would sell for on the open market on that date. SDAT compares it to the assessed value from three years ago and calculates the percentage change. If your assessed value increased, Maryland law phases that increase in evenly over the next three tax years. If your value decreased, the decrease takes effect immediately in 2026.

That phase-in matters. A 12.7% increase in Charles County does not mean your tax bill rises 12.7% in year one. It means roughly one-third of that increase applies in 2026, another third in 2027, and the final third in 2028. For owner-occupied homes, the Homestead Tax Credit provides a second cap on top of the phase-in, limiting how much your taxable assessment can rise in any single year.

2026 Reassessment Results for Southern Maryland

The 2026 Maryland property tax reassessment produced the following residential increases for Southern Maryland counties:

• Charles County: 12.7% residential increase
• St. Mary’s County: 10.5% residential increase
• Calvert County: 8.8% residential increase
• Statewide residential average: 13.2%

For context, the 2025 Group reassessment statewide averaged 20.1%, and the 2023 cycle averaged 23.4%. Southern Maryland values are still appreciating, but the pace reflects a more balanced market than the peak post-COVID years. About 92.7% of Group 2 residential properties across the state saw an increase, but owner-occupied homes with active Homestead credits are protected from absorbing the full increase immediately.

The homeowners most likely to feel the full impact are rental and investment property owners, who do not qualify for the Homestead Tax Credit. Recent buyers are also in a different position: if you purchased your home within the past few years and your taxable assessment was not yet at market value, the 2026 reassessment may reset it closer to what you paid.

What a Higher Assessment Actually Does to Your Tax Bill

Here is a practical example using Charles County. Say your home was assessed at $350,000 three years ago. The 12.7% increase in the 2026 cycle brings the new assessed value to approximately $394,450, a difference of $44,450. Maryland phases that $44,450 in over three years, so your taxable assessment rises by roughly $14,817 per year. At Charles County’s tax rate of approximately $1.13 per $100 of assessed value, that first-year increase adds about $167 to your annual tax bill, or roughly $14 per month.

Now add the Homestead Tax Credit. Charles County’s local cap is 7% per year. On a $350,000 taxable base, a 7% cap limits your taxable assessment increase to $24,500 in year one, regardless of how much the assessed value jumped. In this scenario, the phase-in amount of $14,817 is less than the cap, so the cap does not change the calculation. But on a higher-value home where the phase-in amount would exceed 7% of the existing taxable base, the Homestead cap kicks in and keeps the bill lower.

The takeaway: read the notice, do the math on your specific situation, and do not assume the percentage on the letter equals the percentage increase in your tax bill. For most owner-occupied homeowners in Southern Maryland with an active Homestead credit, the real-world impact is more modest than the headline suggests.

The Homestead Tax Credit: The Cap Most Owners Do Not Know They Have

The Homestead Tax Credit limits how much your taxable property assessment can increase in any given year. Maryland sets a statewide maximum of 10%, but counties can and do set lower limits. The local caps for Southern Maryland in the 2026 tax year are:

• Charles County: 7% per year
• Calvert County: 10% per year (same as state maximum)
• St. Mary’s County: 3% per year

St. Mary’s County’s 3% cap is one of the most protective in Maryland. If your home there was reassessed up 10.5%, your taxable assessment can only rise 3% this year. The difference between the assessed value and the taxable assessment accumulates as a credit. Over multiple cycles of rising values, that gap can represent significant savings for long-term homeowners.

The credit is not applied automatically until you apply. You file once with SDAT, and the credit stays in place as long as the home is your primary residence. If you have never filed, you may be paying taxes on a higher taxable base than necessary. The application is free and available at dat.maryland.gov/homestead. You will need your Real Property Account Number and a one-time access code from SDAT.

Investment properties, rental homes, and vacation homes are not eligible for the Homestead Tax Credit. Those owners pay tax on the full phased-in assessed value with no annual cap.

How to Appeal Your Maryland Property Tax Reassessment

If you believe your assessed value is higher than what your home would realistically sell for on the open market, Maryland gives you the right to challenge it. The appeal process runs in three levels, each with its own deadline.

Level 1: Supervisor of Assessments

You have 45 days from the date printed on your reassessment notice to file a first-level appeal with the local Supervisor of Assessments. This is an informal process, intended as an exchange of information between you and the assessor. You present evidence that the value is too high; the assessor explains how they arrived at the number. Many appeals resolve here, either with an adjusted value or with the homeowner understanding why the assessment is what it is.

The 45-day window is firm and starts from the date on the notice, not from when you received it. If you have misplaced the notice, you can look up your property at SDAT’s online Real Property Search to find the assessed value and relevant dates.

Level 2: Property Tax Assessment Appeals Board (PTAAB)

If the first-level appeal does not resolve the dispute, you have 30 days from the Supervisor’s final notice to appeal to the Property Tax Assessment Appeals Board. PTAAB is an independent board, separate from SDAT. Hearings are more structured than the Supervisor level, but most homeowners present their own cases without attorneys. You and the assessor each present evidence, and the board makes a decision.

Level 3: Maryland Tax Court

If you disagree with the PTAAB decision, you have 30 days to appeal to the Maryland Tax Court. This level is more formal, and most taxpayers at this stage work with an attorney. The vast majority of homeowners who appeal reach a resolution at Level 1 or Level 2 before this stage becomes relevant.

What Actually Wins a Property Tax Appeal

The strongest appeals come down to comparable sales. SDAT’s assessed value is an estimate of market value. If you can document that similar homes near yours sold for less than what your assessment implies, you have a legitimate argument. The assessor has to defend their number against real transaction data.

This is one area where working with a local real estate agent makes a direct difference. I pull comparable sales data across Charles, Calvert, and St. Mary’s counties regularly as part of my normal work. For a homeowner facing a questionable reassessment, those comps are the primary evidence in a Maryland property tax reassessment appeal. A three-bedroom brick colonial on the same street that sold for $50,000 less than your assessed value within the past twelve months is exactly the kind of data that moves the needle at the Supervisor level.

Other documentation that strengthens an appeal:

• A recent appraisal showing a value below the new assessment, particularly from a refinance in 2024 or 2025
• Documentation of condition issues affecting value: a failing well or septic system, a roof or HVAC past its useful life, foundation concerns, or flood zone designation
• Your purchase price, if you bought recently at a price below the new assessed value
• Photos of anything that affects marketability that an assessor would not see on a routine drive-by review

The burden is on you to show the value is too high. Clear, locally specific comparable sales and documented condition issues carry the most weight at both the Supervisor and PTAAB levels. Vague arguments that “everything is too expensive now” generally do not move assessors.

Assessment Value vs. Market Value: They Are Not the Same Thing

One question I hear regularly from Southern Maryland homeowners: “Does my assessment tell me what I could sell my home for right now?”

Not exactly. SDAT’s assessed value is a snapshot based on a January 1 valuation date and comparable sales from the prior period. It is a reasonable estimate, but it can miss neighborhood-level shifts, recent improvements you have made, or condition factors that buyers price in when they walk through. The 2026 assessment for Southern Maryland drew on market data from a period that included some of the most competitive years in recent history. In some cases, current market prices are softer than the assessment suggests.

If you are weighing whether to sell, understanding your actual market position matters more than the assessment. If you are thinking about selling your home in Charles County or elsewhere in Southern Maryland, I can give you a current market analysis that reflects what buyers are offering today, not what SDAT thinks the value was on January 1. Those are often different numbers, and the difference matters for your planning.

If you want to know what your home would actually sell for in today’s market, I am happy to run that analysis. No commitment required.

After Your Appeal: What to Expect

If your first-level appeal results in a reduced assessed value, SDAT will send you a revised notice. The new value then phases in over the remaining reassessment cycle. If you were partway through a phase-in from a prior assessment, the appeal adjustment is applied to the current cycle.

If your appeal is denied at the first level and you choose not to pursue PTAAB, the original assessed value stands for the current three-year cycle. You can raise the issue again at the next reassessment in three years.

A successful appeal does not affect your home’s market value. Property tax assessments and market appraisals are separate documents for separate purposes. Winning an appeal does not show up on your title, in MLS data, or in what a bank would appraise your home at for a mortgage. If you are planning to sell, the appeal is purely about your tax bill during the time you own the property.

It is also worth knowing that Maryland allows you to pay your tax bill without waiving your right to appeal. If the bill is due before your appeal is resolved, you can pay to avoid penalties and still pursue the appeal. A successful appeal results in a credit or refund for any overpayment.

Understanding the full picture of what you pay at closing if you do sell is also useful context. Maryland transfer and recordation taxes are real costs that factor into your net proceeds, and having a clear read on both your ongoing tax burden and your closing costs helps you make better decisions about timing.

Frequently Asked Questions: Maryland Property Tax Reassessment

When does Maryland property tax reassessment happen for Southern Maryland counties?

Charles, Calvert, and St. Mary’s counties are in Group 2. Maryland reassesses Group 2 properties every three years, with the most recent reassessment effective January 1, 2026. Notices were mailed at the end of December 2025. The next Group 2 reassessment will be January 1, 2029.

How long do I have to appeal my 2026 reassessment?

You have 45 days from the date on your reassessment notice to file a first-level appeal with the Supervisor of Assessments. If you appeal and disagree with that decision, you have 30 days to take it to the Property Tax Assessment Appeals Board (PTAAB). From PTAAB, you have another 30 days to appeal to the Maryland Tax Court. Do not miss the initial 45-day window. That window cannot be extended.

Does a higher assessment automatically mean a higher tax bill?

Not necessarily, and not all at once. Maryland phases any increase in assessed value evenly over three tax years. For owner-occupied homes with an active Homestead Tax Credit, your taxable assessment can only rise by your county’s annual cap: 7% in Charles County, 10% in Calvert County, and 3% in St. Mary’s County. Your actual tax increase is typically a fraction of the headline reassessment percentage.

Will appealing my assessment lower my home’s market value?

No. A property tax assessment and a market appraisal are different documents for different purposes. Winning an appeal does not affect your home’s title, what buyers are willing to pay, or what a lender would appraise it at during a sale or refinance. The appeal only affects your tax bill during the period you own the home.

Who qualifies for the Maryland Homestead Tax Credit?

Owner-occupied residential properties that are your primary residence qualify. You must file a one-time application through SDAT to establish eligibility. The credit does not apply automatically. Investment properties, rental homes, and vacation properties are not eligible. Once approved, the credit stays in place as long as the home remains your primary residence. You do not need to reapply each year.

Can I appeal if I already paid my tax bill?

Yes. Paying your tax bill does not waive your right to appeal the underlying assessment. Maryland allows you to pay to avoid penalties and still pursue an appeal. If the appeal is successful, you receive a credit or refund for any overpayment. The two processes are independent of each other.

What if my assessed value went down in 2026?

A decrease in assessed value takes effect immediately and fully in the 2026 tax year. Unlike an increase, which is phased in over three years, a decrease is not phased. Your taxable assessment drops right away. If your value went down and you have an active Homestead Tax Credit, the credit gap narrows as the assessed and taxable values come closer together.

Want a Second Opinion on Your 2026 Assessment?

I have been working Charles, Calvert, and St. Mary’s counties since 2011. If your reassessment notice does not look right to you, I can pull comparable sales for your area and give you an honest read on whether the assessed value holds up against what homes are actually selling for. That conversation is free, and the comps I pull are the same data you would use to build an appeal case. Reach out below before your 45-day window closes.

Disclaimer: The reassessment percentages in this post reflect SDAT’s 2026 Group 2 reassessment report published December 30, 2025, and the Homestead Tax Credit caps reflect the 2026-2027 Maryland county tax rates document published by SDAT. Tax rates, assessment percentages, and credit caps are subject to change. This post is for informational purposes only and does not constitute legal or financial advice. Consult a licensed tax professional or attorney for guidance specific to your situation.

Sources

• Maryland SDAT: Assessment Appeal Process: Official three-level appeal timeline and deadlines
• Maryland SDAT: Homestead Tax Credit: Credit eligibility, application, and county caps
• The BayNet: Maryland Property Tax Assessments Rise By Average Of 12.7% For 2026: 2026 Group 2 reassessment data for Southern Maryland
• Maryland Property Tax Assessment Appeals Boards (PTAAB): Independent appeals board information