Marietta, GA: Is Your Property Tax Assessment Too High? (2026)
The median Marietta homeowner pays $2,697/year in property taxes. That is 3.71% of median household income. See how Marietta compares and check your savings potential.
Key Takeaways
Appeal deadline: 45 days from your assessment notice date - strictly enforced.Median home value: $448,500 in Marietta.Median annual tax bill: $2,697.Tax burden: 3.71% of median household income in Marietta.Potential savings: ~$540/year from a 10% reduction, or $1,620 over 3 years with the 299c freeze.Filed with: Cobb County Board of Assessors (not the city).No risk: Georgia law guarantees your assessment cannot increase from filing an appeal.
Marietta is the Cobb County seat with more than 62,000 residents and a median home value around $448,500 -- about 10% above the county figure. Between the historic Square, established neighborhoods, and new development, there's a wide range of values within the city, and assessments don't always capture those differences accurately.
Marietta Appeal Quick Facts
Appeal Deadline: 45 days from the date of the assessment notice
Median Home Value: $448,500 (10% above Cobb County median)
Estimated Annual Tax Bill: $2,697
Tax Burden: 3.71% of median household income
Is your Marietta property tax assessment too high?
The median home in Marietta is valued at $448,500, producing an estimated annual tax bill of $5,408 at Cobb County's 3.015% combined rate. That means the typical Marietta homeowner spends 3.71% of household income on property taxes alone. Marietta combines higher-than-average home values with a heavy tax burden. If your home is overassessed by even 10%, the cost adds up fast. Higher home values mean a larger tax bill and a bigger payoff from a successful appeal. At $448,500, Marietta home values are 10% above the Cobb County median, 163% above Georgia's statewide median of $170,200, 41% above the national median of $318,000.
How does Marietta compare to other Cobb County cities?
Smyrna leads Cobb County in home values, but your individual assessment could still be too high regardless of where Marietta falls in the county ranking.
What evidence matters for Marietta appeals?
With a population of 62,263, Marietta has plenty of recent sales to draw from. The strongest evidence is 3-5 comparable sales: homes similar to yours in size, age, and condition that sold recently for less than your assessed value. Focus on per-square-foot price comparisons and adjust for differences in lot size, condition, and amenities. For the full evidence strategy, exemption details, and step-by-step filing instructions, see our Cobb County Property Tax Guide.
How much can you save in Marietta?
Based on a combined tax rate of 3.015%. Your actual rate may vary by tax district.
A 10% reduction on the median Marietta home ($448,500 down by $44,850) would save approximately $541 per year, or $1,623 over three years with the 299c value freeze.
At 3.71% of household income, even a modest reduction in your assessed value makes a real difference in your annual budget.
File your appeal through Cobb County
Property tax appeals in Marietta are filed with the Cobb County Board of Assessors. You have 45 days from the date of your assessment notice to submit a PT-311A form.
Cobb County Board of Assessors: 736 Whitlock Avenue, Suite 200, Marietta, GA 30064 | 770-528-3100 For the full appeal process and deadline details, see our Cobb County Property Tax Guide.
Based on 2024 American Community Survey estimates and Cobb County millage rates.
Frequently Asked Questions
Is my Marietta property tax too high?
The median annual property tax bill in Marietta is $2,697. Using Cobb County's millage rate of 3.015%, the computed tax on the median home ($448,500) is approximately $5,408. If your assessed value is higher than what your home would actually sell for, you are overpaying.
Who do I contact to appeal my Marietta property tax?
Appeals are filed with the Cobb County Board of Assessors, not at the city level. File a PT-311A form within 45 days of your assessment notice.
How much of my income goes to property taxes in Marietta?
At the median, Marietta homeowners pay 3.71% of their household income ($72,725/year) in property taxes. That is a significant burden -- a successful appeal directly increases your take-home.
How do Marietta property taxes compare to Smyrna?
Smyrna leads Cobb County with a median home value of $449,500, compared to Marietta's $448,500. But a lower county ranking does not mean your individual home is correctly assessed -- overassessments happen at every price point.
How is my Marietta property tax bill calculated?
Georgia taxes property at 40% of fair market value. For Marietta's median home ($448,500), the assessed value is $179,400. Multiply by Cobb County's millage rate of 3.015% to get your annual bill. In growing cities like Marietta, reassessments often outpace actual market conditions -- compare your assessed value per square foot to recent closed sales within 1 mile of your home.
What evidence wins a property tax appeal in Marietta?
The strongest evidence is 3-5 comparable sales -- homes similar to yours in size, age, and condition that sold recently for less than your assessed value. In Marietta, there are typically enough recent sales to build a strong case. Focus on per-square-foot price comparisons and adjust for differences in lot size, condition, and amenities.
Can my property tax go up if I appeal?
No. Georgia law (O.C.G.A. § 48-5-311) protects you: the county cannot raise your assessed value above what they originally set just because you filed an appeal. The Board of Equalization only rules on the disputed value. Worst case, your appeal is denied and you keep your current assessment -- your taxes will not increase as a result of appealing.