Save on Cobb County Property Taxes
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What Does the Average Cobb County Homeowner Pay in Property Taxes?
Cobb County property taxes are among the highest in Georgia. Here's what a typical homeowner pays and how that compares to your bill.
Median Home Value
~$401K
Ownwell 2026 data
Avg. Annual Bill
~$3,300
With the homestead exemption
Effective Tax Rate
0.9%-1.2%
Varies by location
Properties CCBTA Values
275K+
Across Cobb County
Is your bill fair and equal this year?
You may be over-assessed. A $30,000 over-assessment costs you about $270-$360 every single year and compounds each year you don't challenge it. Ownwell can tell you in seconds.
Why Cobb County Property Tax Bills Are Among the Highest in Georgia
Cobb County is one of Georgia's most prosperous counties, anchored by Marietta and home to some of the Atlanta metro area's most desirable neighborhoods. With a total tax digest projected to grow approximately 4% in 2026 and residential values continuing to rise across Smyrna, Kennesaw, Acworth, and unincorporated Cobb, knowing your assessed value and whether it is accurate matters more than ever.
Multiple Taxing Entities Stack on the Same Property
Your Cobb County property tax bill is the sum of levies from multiple entities: Cobb County, your school district (Cobb County Schools for most residents, or Marietta City Schools for homeowners within Marietta city limits), and your municipality if you live in an incorporated city (Marietta, Smyrna, Kennesaw, Acworth, Powder Springs, Austell, or Mableton). Each sets its own millage rate independently, and every dollar of over-assessment multiplies across all of them.
Annual Reassessment with Rising Values
Georgia reassesses properties annually. Cobb County opted out of the HB 581 floating homestead exemption, relying instead on its existing Cobb County floating homestead exemption, which has protected qualifying homeowners by freezing their county taxable value for decades. However, this protection applies only to the county portion of your bill. Your school district and city tax portions still increase as assessed values rise, which means an accurate assessed value continues to matter significantly.
A Failed Appeal Can Increase Your Value
Georgia is one of the few states where a failed property tax appeal can result in your assessed value being increased. Under Georgia law, if the Board of Tax Assessors finds during the appeal process that your property is undervalued, they may counter-appeal and raise your assessment. This makes working with experienced professionals, like Ownwell, essential before filing.
Win an Appeal: Lock In 3 Years of Protection (299c Freeze)
After a successful appeal in Georgia, your assessed value is frozen at the reduced level for three years under O.C.G.A. § 48-5-299(c). During this period, the county cannot increase your assessed value above the appeal-reduced level unless you make unreported improvements.
How Cobb County Property Tax Rates Work
In Georgia, properties are assessed at 40% of fair market value. Tax rates, called millage rates, are then applied to your assessed value. One mill equals $1 per $1,000 of assessed value. Your total bill is the sum of the millage rates from all taxing entities that cover your address.
Example: For a property with a $400,000 market value: assessed value (40%) is $160,000; gross bill at the 2026 unincorporated combined rate of 30.13 mills is ~$4,821 before exemptions; net bill after the standard basic homestead exemption and Cobb County's own floating homestead exemption is approximately $3,300.
| Taxing Entity | 2025 Rate (per $100 assessed value) | Notes |
|---|---|---|
| Cobb County General Fund | 8.46 mills | Unchanged since 2018 |
| Cobb County Schools | 18.70 mills | Applies to most Cobb County residents; Marietta city parcels use Marietta City Schools (17.97 mills) |
| Cobb County Fire Fund | 2.97 mills | Applies in unincorporated Cobb, Acworth, Kennesaw, Powder Springs, and Mableton areas |
| Unincorporated Total (general, schools, and fire) | 30.13 mills | Most Cobb homeowners and city residents pay additional city millage |
| Marietta (city) | 31.122 mills | Uses Marietta City Schools (17.97 mills) instead of county schools and Marietta City M&O/sinking fund rates; no county bond |
| Acworth | 39.08 mills | Adds 8.95 city millage to county rate |
| Kennesaw | 39.28 mills | Adds 9.15 city millage to county rate |
| Smyrna | 36.15 mills | No county bond; adds 8.99 city millage |
| Powder Springs | 39.63 mills | Adds 9.50 city millage to county rate |
| Austell | 35.41 mills | No county fire tax; adds 8.25 city millage |
| Mableton | 30.13 mills | No city tax; same as unincorporated rate |
| Effective Rate (as % of market value) | 0.9% - 1.2% | Median 0.98% per Ownwell data; lower than nominal rate due to 40% assessment + exemptions |
Rates are approximate and subject to annual adjustment by each taxing authority. Verify your specific millage rates at cobbtax.gov or through the Georgia Department of Revenue's millage rate database.
How the Cobb County Board of Tax Assessors Determines Your Value
Your Annual Notice of Assessment (mailed in spring, typically by mid-May) shows two values: fair market value and assessed value (40% of fair market). Tax rates are applied to the assessed value after any exemptions are subtracted.
Scale-Driven Errors
With more than 275,000 parcels to value annually, the CCBTA relies almost entirely on automated mass appraisal models. Individual property conditions, interior updates, unpermitted improvements, and hyperlocal market factors are frequently missed, creating real opportunities to appeal.
Neighborhood Boundaries May Not Reflect Your Street
The CCBTA groups properties into assessment neighborhoods for mass appraisal. Homes on the edges of these zones may be compared to properties in very different micro-markets, leading to systematic over-assessment in certain areas.
Condition and Deferred Maintenance Ignored
Assessors working from aerial imagery and data records cannot capture roof condition, foundation issues, flood damage history, or deferred maintenance. These factors can meaningfully reduce a property's true market value and your assessed value.
First Informal Offers Are a Starting Point
The BOA informal review process resolves appeals quickly — for the county. Many homeowners accept a minor reduction without realizing Ownwell's data-driven approach can often support a significantly larger reduction.
Cobb County Property Tax Appeal Dates for 2026
The Cobb County Board of Tax Assessors mails Annual Notices of Assessment each spring. You have 45 days from the date on your notice to file an appeal. The 2026 deadline for residential and commercial properties is July 20, 2026.
Missing this deadline means waiting until the following year. Ownwell monitors your account and files before the window closes.
| Date | What Happens |
|---|---|
| January 1, 2026 | Valuation date — CCBTA assesses your property's value as of this date |
| April 1, 2026 | Homestead exemption application deadline for the 2026 tax year; per HB 92 (2025), late applications accepted through the appeal deadline on your notice |
| ~May 2026 | Annual Notice of Assessment mailed by CCBTA |
| July 20, 2026Key Date | Appeal filing deadline (residential & commercial) — 45 days from notice date. File with CCBTA (informal appeal). Ownwell files for you. |
| ~90 days after filing | CCBTA informal review period; CCBTA may adjust your value. |
| ~Fall 2026 | If still disputed, appeal forwarded to the Board of Equalization (BOE) for a formal hearing. |
| September 1, 2026 | Property tax bill issued by Cobb County Tax Commissioner. |
| October 15, 2026 | Property tax bill due — pay in full to avoid penalties. Georgia law requires you to pay the temporary assessed value even if an appeal is pending. |
| 120 days after due date | Penalties begin accruing — 5% penalty at 120 days, up to 20% maximum. |
Important: Georgia law requires you to pay the temporary assessed value — the lesser of the prior year's assessed value or 85% of the current year's proposed value — by October 15, even if an appeal is pending. Failure to pay results in penalties regardless of the appeal outcome.
Cobb County Exemptions You May Be Missing
Exemptions reduce your taxable assessed value before millage rates are applied. Filing for every exemption you qualify for — and appealing your assessed value — works together to minimize your bill. The homestead exemption deadline is April 1 each year; per HB 92 (2025), late applications are also accepted through the appeal deadline on your assessment notice.
Important — Apply Online: Apply for all Cobb County homestead exemptions through the Cobb County Tax Commissioner at cobbtax.gov. Once granted, exemptions renew automatically as long as you continue to occupy the property as your primary residence.
However, it is now your responsibility to notify Cobb County if you're eligible for the homestead exemption. Failing to do so will result in owing all unpaid taxes and interest, plus a 50% penalty on the amount that was improperly reduced.
No age or income limit. For all owner-occupants as of January 1. Reduces your assessed value by $10,000 in both the county general and county school general tax categories, saving the average homeowner approximately $272 in annual taxes before the floating homestead is applied. Apply through the Cobb County Tax Commissioner.
Cobb County's existing floating homestead exemption has protected qualifying homeowners for decades. It freezes the county taxable value of your property at the level established when you first filed for homestead, protecting you from annual county tax increases as property values rise. This is why Cobb opted out of the statewide HB 581 exemption. It applies only to the county portion of your bill; school and city taxes are still calculated on your current assessed value — which is why appealing your assessed value still matters.
Homeowners age 62 or older as of January 1 qualify for a total exemption from all county school general and school bond taxes. Since school taxes represent the largest share of most Cobb County bills, this exemption can save qualifying homeowners thousands of dollars per year. No income requirement. Apply through the Cobb County Tax Commissioner.
Disabled veterans and surviving spouses qualify for a minimum $32,500 exemption or the maximum amount under the index set by the U.S. Secretary of Veterans Affairs ($126,526 in 2026), whichever is greater. Any assessed value beyond the exemption amount remains taxable.
Surviving spouses of U.S. military members killed in the line of duty receive a $60,000 exemption plus an additional index-based amount. Surviving spouses of law enforcement officers and firefighters killed on duty are fully exempt from property taxes on their homestead as long as they continue to reside there.
Ownwell Handles Your Cobb County Appeal From Start to Finish
Appealing your Cobb County property taxes with Ownwell takes less than five minutes to start. Our technology analyzes your property, builds your case, and handles every step with CCBTA — so you never have to attend a hearing or file a single form.
Enter Your Address
Ownwell instantly analyzes your property, pulls your current assessed value from CCBTA records, and identifies your best path to a reduction.
We Build Your Case
Our technology and local Cobb County property tax experts compare your assessment against recent comparable sales, neighborhood data, and property condition factors.
We File & Represent You
Ownwell files your appeal with the CCBTA before the July 20 deadline and represents you through the informal review and, if necessary, the formal Board of Equalization (BOE) hearing.
You Save and Stay Protected
You only pay 35% of the actual savings we secure, plus a $20 fee for securing the three-year 299c freeze. No reduction means no fee — ever.
How to Pay Your Cobb County Property Taxes
Penalties begin accruing on October 16 for any unpaid balance, with a 5% penalty applied on the 120th day after the due date and an additional 5% every 120 days thereafter, up to a maximum of 20% of the total bill. If you have a pending appeal, you are still required to pay the temporary assessed bill on time to avoid penalties.
Pay Online
Visit cobbtaxpayments.org to pay by credit card, debit card, e-check, or other accepted methods using your parcel ID number.
Pay by Mail
Mail your check or money order, payable to the Cobb County Tax Commissioner, to P.O. Box 100127, Marietta, GA 30061. Allow adequate mailing time to ensure receipt before October 15.
Pay In Person
Pay in person at any Cobb County Tax Commissioner location. The main office is located at 736 Whitlock Ave NW, Suite 100, Marietta, GA 30064. Additional service locations and kiosks are available across the county.
Payment Plans
Cobb County does not offer standard installment payment plans for current-year bills. For delinquent tax situations, contact the Tax Commissioner's office at cobbtax.gov for available options.
Frequently Asked Questions About Cobb County Property Taxes
What is the Cobb County property tax appeal deadline for 2026?
How much does Ownwell charge to appeal my Cobb County property taxes?
Is there any risk to appealing my Cobb County property taxes?
What is the Cobb County homestead exemption and how do I apply?
When you apply, Cobb County's floating homestead exemption also applies, freezing the county taxable value of your property. The application deadline is April 1 each year, though per HB 92 (2025), late applications are accepted through the appeal deadline on your notice.
Apply through the Cobb County Tax Commissioner at cobbtax.gov. Once granted, exemptions renew automatically as long as you remain the primary occupant.
What is the 299c freeze and how does it benefit me?
During this period, the Board of Tax Assessors cannot increase your assessed value above the appeal-reduced level unless you make unreported improvements. Because Cobb County's school taxes and any applicable city taxes are both based on your assessed value, the 299c freeze delivers compounded savings across multiple taxing entities.
What is the effective property tax rate in Cobb County?
With a median home value of approximately $401,000, the median Cobb County homeowner pays roughly $3,300 per year in total property taxes.
How do I look up my Cobb County property tax assessment?
Do I still have to pay taxes while my appeal is pending?
What happens at a Board of Equalization (BOE) hearing?
What exemptions beyond the Basic Homestead Exemption should I check?
• Cobb County Floating Homestead: Freezes the county taxable value of your property when applied. In place for decades; applies only to the county portion of your bill. Apply at cobbtax.gov by April 1.
• School Tax Exemption (Age 62): Full exemption from all county school general and school bond taxes for homeowners 62 or older. No income requirement.
• $22,000 Disability Exemption: $22,000 off assessed value in all tax categories except state for homeowners who are 100% disabled and with income under $12,000.
• State Veteran's Disability Exemption: Full exemption in all tax categories for veterans with a 100% service-connected disability rating.
• Surviving Spouse (Peace Officer / Firefighter): Full homestead value exemption for unremarried surviving spouses of peace officers or firefighters killed in the line of duty.