Taxes in Marietta
Marietta's property tax picture layers a genuinely stable City of Marietta municipal rate on top of Cobb County's own rate and an applicable school-district rate that depends on whether an address sits inside city limits -- plus Georgia's now-flat 4.99% state income tax and a modest local sales tax layer.
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Learn moreThe City of Marietta's own rate: flat for 25 consecutive years
The City of Marietta held its total municipal millage rate at 4.692 mills for the 2026 budget cycle -- unchanged for a 25th consecutive year, per Marietta Daily Journal and Cobb County Courier reporting. Because Georgia law still requires the county to advertise this as a technical "tax increase" whenever the overall property tax digest (total assessed value) rises even at a flat rate, rising home values mean rising total revenue and, for many homeowners, a rising bill despite the unchanged rate. This municipal rate applies only inside the actual city limits.
Cobb County's own layer
Cobb County's 2026 General Fund M&O millage rate is 8.46 mills, alongside a separate 2.97-mill Fire millage rate; a 2.45-mill Cumberland Special Services District II rate applies only to that specific district near the Cumberland/Galleria area, not citywide Marietta. These county-level rates apply across Cobb County generally, not just within Marietta's city limits.
The school-district millage layer was not resolved this pass -- a real, disclosed gap
Depending on whether a given address is inside Marietta city limits (Marietta City Schools) or in unincorporated Cobb County (Cobb County School District), a different school-district millage rate applies on top of the city and county layers above -- this pass did not verify a current, specific millage figure for either school district, and that gap is disclosed here rather than estimated. Confirm the applicable school millage directly with the Cobb County Tax Commissioner's office for a specific parcel.
Georgia's flat 4.99% state income tax, and a state sales tax base plus local add-ons
Georgia's state personal income tax is a flat 4.99% as of tax year 2026, down from a graduated system as recently as 2023 (see the state record for the full phase-down history). Georgia's state sales tax base rate is 4%, with counties and cities layering on local option taxes that push the statewide average combined rate to roughly 7.4% -- this pass did not independently verify Cobb County's specific combined local sales tax rate, so treat the statewide average as directional pending confirmation for a Marietta-specific transaction.
Georgia's homestead exemption, retirement income exclusion, and no tax on Social Security
Beyond the standard homestead exemption available after closing (see buying-a-home), Georgia excludes up to $65,000 of qualifying retirement income per person for taxpayers 65 or older (up to $35,000 for ages 62-64), and does not tax Social Security benefits at all -- real, state-level provisions relevant to anyone weighing Marietta for retirement (see retiring).
Key takeaways
- The City of Marietta's own municipal millage rate is 4.692 mills for 2026, unchanged for a 25th consecutive year -- though rising property values still mean rising total tax revenue and, for many owners, a rising individual bill. This rate applies only inside the actual city limits.
- Cobb County's 2026 General Fund M&O rate is 8.46 mills, plus a separate 2.97-mill Fire millage that applies countywide; a 2.45-mill Cumberland Special Services District rate applies only to that specific area, not citywide.
- The applicable school-district millage (Marietta City Schools vs. Cobb County School District, depending on address) was not resolved to a verified 2026 figure this pass -- a real, disclosed gap; confirm directly with the Cobb County Tax Commissioner for a specific parcel.
- Georgia's flat state income tax is 4.99% for 2026; the state sales tax base is 4%, with local add-ons pushing the statewide average combined rate to roughly 7.4% (Cobb-specific combined rate not independently verified this pass).
- Georgia excludes up to $65,000 of qualifying retirement income per person for filers 65+ ($35,000 for 62-64) and does not tax Social Security -- real provisions for retirees weighing Marietta.
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