March 11, 2026
Cobb County Property Taxes Explained: Rates, Exemptions, and How to Appeal
The Property Tax Question Nobody Thinks to Ask Until It’s Too Late
I have been selling homes in Cobb County long enough to know that property taxes almost never come up in the early conversations buyers have. Buyers want to know about the school districts, the commute, the condition of the home — and I get that. But I have watched buyers close on a home in late summer only to receive a property tax bill in the fall that was meaningfully higher than they had accounted for in their monthly budget.
I make it a point to walk every buyer through the property tax picture early in the process. And the good news is that Cobb County is one of the more favorable counties in Georgia for property taxes — our effective rate of 0.68% is below the Georgia state average of 0.74%, and below the national average by an even wider margin.
That said, understanding exactly how your bill is calculated — and whether you are taking every exemption you are entitled to — is worth an hour of your time. This post covers all of it, including the appeal process that many homeowners do not know is available to them.
If you have questions about what your property taxes would be on a specific home you are considering, give me a call. I look this up for my buyers as a standard part of my service.
How Cobb County Property Taxes Are Calculated
Georgia has a specific formula for calculating property taxes that is consistent across the state but applied with county-specific millage rates.
Step 1: Fair Market Value The Cobb County Tax Assessor’s office determines the Fair Market Value (FMV) of your property — their estimate of what it would sell for on the open market. This is reassessed periodically, and in a rising market, your assessed value will tend to increase over time.
Step 2: Assessed Value (40% Rule) Georgia law requires that property be assessed at 40% of its Fair Market Value. This is sometimes called the “taxable value” or “assessed value.”
So if your home’s Fair Market Value is $383,717 (the Cobb County median), the Assessed Value is: $383,717 × 40% = $153,487
Step 3: Apply Exemptions Before the millage rate is applied, any exemptions you qualify for are subtracted from the Assessed Value. For example, the basic homestead exemption of $10,000 reduces the taxable assessed value from $153,487 to $143,487.
Step 4: Apply the Millage Rate The millage rate is expressed in “mills” — one mill equals $1 of tax per $1,000 of assessed value. Cobb County’s total millage rate is a combination of several component rates levied by different taxing entities.
Step 5: Your Tax Bill Multiply the net assessed value (after exemptions) by the millage rate expressed as a decimal.
Cobb County’s Millage Rate Components
Your Cobb County property tax bill is not one single rate — it is a sum of several different levies from different governing bodies. Here are the components:
County General Fund This funds county government operations — roads, public safety (police and fire), courts, libraries, and other general services. The county millage rate is set annually by the Cobb County Board of Commissioners.
Cobb County School District The school millage rate is the largest single component of your tax bill. It funds the operations of Cobb County School District — the largest employer in the county. This is also the component that senior residents can exempt themselves from entirely under certain programs (more on that shortly).
City of Marietta / City of Kennesaw / City of Smyrna (if applicable) If your property is inside the incorporated limits of a city — Marietta, Kennesaw, Smyrna, Acworth, or Powder Springs — you pay an additional city millage rate on top of the county rate. If you are in unincorporated Cobb County, you pay only the county and school rates (and do not pay a city rate).
Fire Districts Some unincorporated areas of Cobb County have separate fire district millage assessments.
The total combined millage rate for most Cobb County properties (county + school, no city) results in an effective rate around 0.68% of fair market value for typical homesteaded properties.
Real Dollar Example: Property Taxes on a $383,717 Home
Let me walk through the actual calculation on the Cobb County median home price with the basic homestead exemption applied:
| Step | Calculation | Result |
|---|---|---|
| Fair Market Value | — | $383,717 |
| Assessed Value (40%) | $383,717 × 0.40 | $153,487 |
| Less Homestead Exemption | -$10,000 | $143,487 |
| Estimated Annual Tax (0.68% effective) | $383,717 × 0.0068 | ~$2,609 |
On a monthly basis, that works out to approximately $217 per month — a figure your lender will include in your escrow payment calculation.
If you are in an incorporated city like Marietta, add the city millage rate on top. The City of Marietta’s millage rate adds approximately $500 to $900 per year to a median-priced home depending on the specific rate for that tax year. This is a meaningful difference and one I always flag for buyers comparing homes inside versus outside city limits.
For context, these tax figures factor into the overall cost of living picture I describe in my Kennesaw cost of living guide.
Every Property Tax Exemption Available in Cobb County
This is the part of property taxes where most homeowners leave money on the table. Georgia offers several powerful exemptions, and they are not automatically applied — you have to apply for them.
Basic Homestead Exemption — $10,000
Available to any owner-occupant who uses the property as their primary residence. The exemption reduces your Assessed Value by $10,000, saving you roughly $200 to $400 per year depending on your millage rate. You must apply through the Cobb County Tax Assessor’s office. The deadline to file for the exemption is April 1st for it to apply to that year’s tax bill.
You only need to apply once — the exemption stays in place as long as you own and occupy the property.
Senior Exemption — Age 62+, School Tax Exemption
This is one of the most valuable exemptions in the state for qualifying seniors. Georgia homeowners who are 62 years of age or older can apply to have their home’s value frozen for school tax purposes at the level it was assessed when they first qualified, AND receive an exemption from some or all school district taxes.
The school tax component is the largest part of your property tax bill. For a senior homeowner in Cobb County, this exemption can save $1,000 to $2,500 per year or more depending on home value.
Income limits apply for some tiers of the senior exemption. Contact the Cobb County Tax Assessor’s office directly or ask me for a referral to a CPA who handles these applications — the paperwork is straightforward but the savings are significant.
Age 65+ Additional County Exemption
Once you reach age 65, additional county tax exemptions may be available depending on your income. Georgia Code Section 48-5-47 provides for expanded homestead exemptions for seniors meeting income thresholds. Combined with the age 62+ school tax exemption, qualified seniors in Cobb County can dramatically reduce their annual property tax burden.
Disability Exemption
Georgia provides property tax exemptions for certain disabled individuals. The specific exemption amount and eligibility requirements vary — some disability exemptions are based on a documented total and permanent disability, while others apply to disabled veterans specifically.
Veteran Exemptions
Disabled Veterans with a service-connected disability rating of 100% from the VA are eligible for a complete exemption from property taxes on their primary residence under Georgia Code Section 48-5-48. This is one of the most generous veteran property tax benefits in the South.
Veterans with lower disability ratings may qualify for partial exemptions. Surviving spouses of veterans killed in action also qualify for exemption continuation.
Conservation Use Valuation Assessment (CUVA)
If you own rural or agricultural land in Cobb County (less common, but not unheard of in the western portions of the county), you may qualify for a Conservation Use Valuation Assessment that freezes your assessed value at current use value rather than development value. This is primarily relevant for larger land parcels.
City vs. Unincorporated Cobb County: The Tax Difference
I want to be clear about something that surprises many buyers: living inside a city limits in Cobb County means paying both city AND county property taxes. If you live in unincorporated Cobb County, you pay only county and school taxes.
Here is what that means in practice for the major cities:
City of Marietta: Adds a city millage rate that increases total property taxes. Marietta provides its own city services (police, parks, etc.) in exchange for this additional tax.
City of Kennesaw: Kennesaw has its own millage rate for city services. Kennesaw is known for its low overall tax burden relative to what you receive in services.
City of Smyrna: Smyrna levies a city millage on top of county taxes. Proximity to the Cumberland employment corridor and excellent city services make Smyrna very popular despite the additional city tax.
City of Acworth: Similar structure — city millage on top of county.
Unincorporated Cobb County: You pay county and school taxes only. No city millage. For many homeowners, this represents meaningful annual savings — potentially $500 to $1,200 per year compared to living inside a city of comparable home value.
When I am helping buyers compare two homes — one inside city limits and one in unincorporated Cobb — I always run the actual tax numbers on both. It occasionally changes the calculus on which home is the better value.
How to Appeal Your Cobb County Property Tax Assessment
If you believe the Cobb County Tax Assessor has overvalued your home, you have the right to appeal. The appeal process is not complicated, and it is more common than most homeowners realize. Here is how it works:
Step 1: Review Your Assessment Notice Cobb County mails annual assessment notices, typically in the spring. Review it carefully. Compare the Fair Market Value stated on the notice to recent sales of comparable homes in your neighborhood.
Step 2: File Your Appeal by April 1st The deadline to appeal is April 1st of the tax year. This is non-negotiable. File through the Cobb County Board of Tax Assessors — you can file online at the Cobb County Tax Commissioner’s website or in person.
Step 3: Gather Your Evidence The strongest appeals are supported by evidence. Gather:
- Recent comparable sales (within the last 6-12 months, similar size and age, within your neighborhood or nearby)
- Any condition issues with your home that would reduce its market value (foundation problems, outdated systems, deferred maintenance that is not reflected in the assessment)
- A recent appraisal if you have one
- Photos documenting condition issues
Step 4: Board of Equalization Hearing If the Tax Assessor’s office does not resolve your appeal administratively, it goes to the Cobb County Board of Equalization — a three-member panel of citizens who hear property tax appeals. You present your evidence, the assessor’s office presents theirs, and the Board makes a determination.
Step 5: Further Appeal Options If you disagree with the Board of Equalization’s decision, you can appeal further to Superior Court. Most homeowners resolve their appeals at the Board of Equalization level.
Does It Work? Yes — a well-prepared appeal with good comparable sales data is often successful. In a market where home values increased rapidly, some assessments lag the market (meaning your home is correctly valued at current market). But in neighborhoods where prices have softened or for homes with condition issues, appeals can produce meaningful reductions.
I frequently help my clients understand whether an appeal is worth pursuing. If you have received an assessment that seems high relative to what you paid for the home or what comparable homes have sold for, give me a call.
Property Taxes and the Homebuying Decision
For buyers choosing between Cobb County and neighboring counties, the property tax picture is part of the overall cost analysis. Here is a quick comparison:
- Cobb County effective rate: ~0.68% (below Georgia and national averages)
- Cherokee County: Slightly lower, but farther from Atlanta employment centers
- Fulton County: Significantly higher effective rates, especially in Atlanta proper
- Gwinnett County: Comparable to Cobb
For buyers considering Cobb County versus Fulton, the property tax savings can be several thousand dollars per year on a comparable home — which, over a decade, is a substantial difference in cumulative cost.
For a full picture of what it costs to own a home in this market, my closing costs Georgia explained guide covers the one-time costs at purchase, and my understanding the Georgia real estate market in 2026 post covers where prices are heading.
Frequently Asked Questions
What is the property tax rate in Cobb County, Georgia?
Cobb County’s effective property tax rate is approximately 0.68% of fair market value for homesteaded properties — below the Georgia state average of 0.74%. This effective rate already factors in the basic homestead exemption. Note that properties inside the incorporated limits of cities like Marietta, Kennesaw, or Smyrna pay an additional city millage rate on top of the county rate.
How is property tax calculated in Cobb County?
Your property is assessed at 40% of its fair market value as determined by the Cobb County Tax Assessor. Applicable exemptions (such as the $10,000 homestead exemption) are subtracted from the assessed value. The resulting net assessed value is multiplied by the combined millage rate (county + school + city, if applicable) to produce your annual tax bill.
What is the homestead exemption in Cobb County?
The basic homestead exemption reduces your assessed value by $10,000, saving approximately $200-$400 per year. You must apply by April 1st of the tax year through the Cobb County Tax Assessor’s office. The exemption applies only to your primary residence. Additional exemptions are available for seniors (age 62+ for school tax relief, 65+ for additional county relief), disabled individuals, and veterans.
Can seniors reduce their property taxes in Cobb County?
Yes, significantly. Homeowners age 62 and older can apply for an exemption from some or all Cobb County School District taxes — the largest component of the property tax bill. This can reduce annual taxes by $1,000 to $2,500 or more depending on home value. Homeowners age 65 and older may qualify for additional county exemptions based on income. Applications are filed with the Cobb County Tax Assessor’s office.
How do I appeal my property tax assessment in Cobb County?
File an appeal with the Cobb County Board of Tax Assessors by April 1st of the tax year. Support your appeal with recent comparable sales, condition documentation, and any independent appraisal you have. If the assessor’s office does not resolve the appeal administratively, it proceeds to a hearing before the Board of Equalization. Well-supported appeals can result in meaningful reductions in assessed value.