Property tax
Cobb's 2026 millage table puts a parcel in the Marietta tax district (code 4) at 31.122 mills: 8.46 Cobb County general, 4.692 city general and bond, and 17.97 for Marietta City Schools.
For investors: Marietta parcels skip Cobb's 18.70 school and 2.97 fire mills, yet the 31.122 total still tops unincorporated Cobb's 30.13. Rentals inside the Downtown Marietta Development Authority district (Marietta DMDA) add 1.272 mills, for 32.394 in all.
Source: Cobb County Tax Commissioner, 2026 Millage Rates of Cobb County Bills (Marietta, code 4, and Marietta DMDA rows), Oct 2026
Marietta's 2026 notices proposed keeping the city rate at 4.692 mills for a 25th year, yet advertised a 5.73% tax increase because the 2.788-mill operating rate tops the 2.637-mill rollback rate.
For investors: The city's floating homestead exemption, in place since 2002, freezes city assessments on owner-occupied homes at purchase price until sale. A rental gets no freeze, so its city taxes track Cobb's current appraisal, and a home bought from a longtime owner-occupant resets upward.