Marietta homeowners get two bills: Cobb County's is due Oct. 15 and the city's is due Oct. 31. The 2026 total rate is 31.122 mills. City: 770-794-5680.
Last checked Oct. 5, 2026. Sources: the City of Marietta Tax Division, the Cobb County Tax Commissioner and its 2026 millage rate chart (PDF).
A homeowner inside the Marietta city limits is on what the city calls a dual taxing system: two bills from two offices. The Cobb County Tax Commissioner bills the county share. The city of Marietta’s Tax Division bills the city share and the Marietta City Schools share, because the city runs its own school district. Cobb County fire and Cobb County school taxes do not appear on a Marietta city homeowner’s bill.
Who to call
- City of Marietta tax bill (city and Marietta City Schools): Tax Division, 770-794-5680, City Hall, 205 Lawrence St., first floor; automated information 24 hours a day at 770-794-5130; search or pay a city bill
- Cobb County tax bill: Cobb County Tax Commissioner, 770-528-8600, 736 Whitlock Ave., Suite 100; pay online
- Property value, appeals and tax returns: Cobb County Board of Tax Assessors, 770-528-3100, 736 Whitlock Ave., Suite 200
- Official pages: city Tax Division and Cobb County property FAQs
Due dates for 2026
| Bill | Who sends it | Due |
|---|---|---|
| Cobb County | Cobb County Tax Commissioner, mailed by Aug. 15 | Thursday, Oct. 15 |
| City of Marietta (city and schools) | Marietta Tax Division, mailed in August | Saturday, Oct. 31 |
The county says a payment postmarked by the U.S. Postal Service by midnight on the due date is on time; metered or kiosk postage dates do not count. The city accepts exemption applications postmarked by the deadline. If a bill never arrives, you still owe it: both offices let you look up and print a copy online.
The 2026 tax rate
Rates are in mills. One mill is $1 for every $1,000 of assessed value, and property in Georgia is assessed at 40% of its fair market value. The Cobb County Tax Commissioner’s 2026 rate chart lists the Marietta rates:
| Levy | Mills | Billed by |
|---|---|---|
| Cobb County general | 8.46 | Cobb County |
| City of Marietta general | 2.867 | City |
| City of Marietta bond | 1.825 | City |
| Marietta City Schools | 17.97 | City |
| Total | 31.122 |
The total has not changed since 2023, according to the county’s rate charts for 2023 to 2026. In 2022 it was 31.247 mills, with a city bond levy of 1.95.
Property in the downtown district of the Downtown Marietta Development Authority pays an extra 1.272 mills in 2026, and property in the Gateway Marietta Community Improvement District pays an extra 5 mills.
A worked example, before any exemption: a home with a fair market value of $400,000 is assessed at $160,000. At 31.122 mills, the tax before exemptions is $4,979.52 for the year, split between the two bills.
The city says Marietta’s property taxes are the lowest of any metro Atlanta city with more than 10,000 residents. Its own comparison table lists Smyrna at 36.15 mills and Kennesaw at 39.28.
Homestead exemptions
You qualify for the city’s exemptions if you own the home, live in it and claim it as your legal residence by Jan. 1. The city’s exemptions page lists:
- Regular homestead exemption: $4,000 off the assessed value. Bring a Georgia driver’s license or ID showing the property address.
- Floating exemption: the city freezes the taxable value of a reassessed home at a base year, so later increases in value are exempt from city taxes. City voters approved it in November 2001.
- School tax exemption: for owners 62 or older by Jan. 1, on no more than 1 acre.
- Disability exemption: $2,000 for a homeowner who is totally disabled, with proof from a physician.
- Veteran’s disability exemption: for veterans with a 100% disability rating from the U.S. Department of Veterans Affairs, and for an unremarried surviving spouse or minor children.
Apply by April 1. The city says state law now also allows an application until the end of the 45-day assessment appeal window. A form filed late counts for the next year. Apply online with the city’s one-signer or two-signer application. Exemptions renew automatically unless ownership changes. County exemptions are filed separately with the Cobb County Tax Commissioner.
How to appeal your value
The Cobb County Board of Tax Assessors mails an assessment notice to every property owner before July 1. It is not a bill. It shows the fair market value as of Jan. 1, the previous value and an estimate of exemption savings. If you think the value is wrong, file an appeal with the assessors during the 45-day window on the notice; call 770-528-3100.
An appeal does not delay the bill. The county says you must pay at least the undisputed amount by the due date to avoid the 5% penalty, and interest builds on any balance.
Late payment
- Cobb County: a 5% penalty plus interest every month after Oct. 15. After that a tax lien (fi. fa.) can be issued if the bill stays unpaid 30 days after a written notice.
- City of Marietta: interest at the prime rate plus 3%, and a 5% penalty 120 days after the due date and every 120 days after that, up to 20%.
What this means for you
- Two bills, two dates: Oct. 15 for Cobb County, Oct. 31 for the city.
- Moved in this year? Apply for the city and county homestead exemptions before April 1.
- If your mortgage company pays from escrow, the city sends it the bill only if the lender asks in time. Check that both bills were paid.
Related guides: home prices, moving to Marietta and who to call at City Hall.
Frequently asked questions
When are Marietta property taxes due?
Marietta homeowners pay two bills. The Cobb County Tax Commissioner’s bill is due Oct. 15, and the City of Marietta’s bill, which includes Marietta City Schools, is due Oct. 31.
What is the property tax rate in Marietta?
The 2026 total is 31.122 mills: 8.46 for Cobb County, 2.867 for the city’s general fund, 1.825 for city bonds and 17.97 for Marietta City Schools. Property is taxed on 40% of its fair market value.
How do I appeal my property value in Cobb County?
File an appeal with the Cobb County Board of Tax Assessors within the 45-day window that starts with the annual assessment notice mailed before July 1. You must still pay at least the undisputed amount by the due date.
What is the Marietta homestead exemption?
Owners who live in their Marietta home by Jan. 1 qualify for a $4,000 city homestead exemption. Apply to the city Tax Division by April 1, or within the 45-day appeal window.
What is the penalty for paying Cobb County property tax late?
Cobb County adds a 5% penalty plus monthly interest to taxes not paid by Oct. 15. The city charges interest and a 5% penalty every 120 days, up to 20%.
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