How to Appeal Property Taxes in Cobb County, Georgia (2026 Guide)

Cobb County’s 2026 residential assessment notices were mailed Friday, June 5, 2026, and the appeal deadline is Monday, July 20, 2026. File with the Cobb County Board of Tax Assessors online through the assessor’s appeal/property-search portal, by mail to P.O. Box 649, Marietta, GA 30061-0649, or in person at 736 Whitlock Avenue, Suite 200, Marietta, GA 30064. A normal Board of Equalization appeal is free.

How assessments work in Cobb County

Cobb’s assessment year is built around one date: January 1. The value on your 2026 Notice of Assessment is the Cobb County Board of Tax Assessors’ opinion of your property’s fair market value as of January 1, 2026, based on the property’s condition and use on that date. Georgia taxes real property at 40% of fair market value, so a $500,000 notice value becomes a $200,000 assessed value before exemptions and millage rates are applied.

For 2026, Cobb says commercial, residential, and personal property notices were mailed June 5. The notice is not the tax bill. Cobb says tax bills are expected around August 15 and due around October 15, while 2026 rates may not be adopted until later in the summer. That timing matters: you have to appeal the value before you know the final bill.

Cobb explains its values using recent comparable sales, location, size, age, and condition. The county’s 2026 public digest notes say the housing market has been stable, with prices up slightly, more homes for sale, and longer selling times. The 2026 digest was closing with a little more than 5% growth countywide. If your home jumped more than nearby comparable homes, or the county’s record card is wrong, that is where your appeal starts.

One local detail many homeowners miss: Cobb’s floating homestead exemption protects the county general-fund portion of a homesteaded property from increases caused solely by reassessment. It does not wipe out school, fire, city, bond, or special-district taxes. If your notice looks high but you have homestead, estimate the real bill before deciding whether the appeal is worth your time.

Whether you should appeal

Appeal when you can support a lower January 1, 2026 market value with facts. Strong Cobb evidence usually includes: comparable sales before January 1, 2026; photos and contractor estimates for condition problems that existed on January 1; a recent appraisal; or errors in the county record such as square footage, basement finish, bath count, grade, condition, or land characteristics.

Do not appeal only because the value increased a lot from last year. Cobb’s own FAQ says the amount of year-to-year change is not a valid basis by itself. Your question is narrower: would this property have sold for the county’s 2026 value on January 1, and is it valued uniformly with similar homes?

Georgia DOR publishes appeal-volume statistics, but not a clean homeowner “success rate” or median reduction for Cobb. The latest official appeal-statistics report available during this research showed Cobb had 259,626 parcels, 14,509 total appeals for the prior digest year, and 13,454 of those went the Board of Equalization route. The report does not say how many won reductions, so any advertised Cobb win rate should be treated cautiously unless the source explains its data.

Savings example using Cobb’s actual adopted 2025 unincorporated rate: Cobb’s 2026 estimator uses 2025 adopted millage rates, and the 2025 unincorporated county total is 30.13 mills: 8.46 county general, 2.97 fire, and 18.70 county school. Suppose your 2026 notice says $525,000, but three good pre-January 1 sales support $475,000. A $50,000 fair-market reduction lowers assessed value by $20,000 because Georgia assesses at 40%. At 30.13 mills, estimated annual tax savings are $20,000 × 0.03013 = $602.60 before city taxes and exemption interactions. If the reduction qualifies for Georgia’s multi-year appeal-value freeze, that could matter for more than one tax year, but do not count the same savings twice if Cobb’s floating homestead already shields part of your county general tax.

Step-by-step how to file

1. Pull your notice and property record. Confirm the parcel ID, notice date, 2026 fair market value, exemptions, and appeal deadline. Check the assessor’s property search for the full property card, not just the notice summary.

2. Choose your appeal grounds. Most homeowners choose value and, where appropriate, uniformity. Georgia also allows appeals based on taxability and exemption denial. If Cobb denied or omitted an exemption, say that clearly.

3. Use the official form or a written letter. The form is the Georgia/Cobb PT-311A Appeal of Assessment / Appeal of Assessment for Digest Year form. Cobb also accepts any timely written appeal that identifies the property by parcel number or address and states the appeal route. The form asks you to choose Board of Equalization, arbitration, hearing officer, or Superior Court if mutually agreed.

4. For most homeowners, choose Board of Equalization. BOE is available for value, uniformity, taxability, and exemption-denial issues and has no filing fee unless you hire help. Non-binding arbitration is limited to value and requires a certified appraisal and filing fee. Hearing officer appeals are generally for non-homesteaded real property or wireless personal property over the statutory value threshold and are not the normal owner-occupied-home path.

5. Attach only useful evidence. A concise package is better than a dump. Include a one-page value summary, three to five comparable sales, photos of condition issues, repair estimates, and screenshots of record-card errors. Use sales before January 1, 2026; the Cobb BOE says only sales before January 1 of the tax year are considered at the hearing.

6. Submit by July 20, 2026. Online filing is available through Cobb’s assessor appeal/property-search system; Cobb’s tutorial shows the online appeal starting from the blue “Appeal to Board of Assessors” button. Mail must be USPS postmarked by the deadline; Cobb warns that metered mail is not proof of timely filing. Hand delivery is to Cobb County Board of Tax Assessors, 736 Whitlock Avenue, Suite 200, Marietta, GA 30064. Mailing address: Cobb County Board of Tax Assessors, P.O. Box 649, Marietta, GA 30061-0649. Cobb publishes CobbTaxAssessor@cobbcounty.gov for questions; do not rely on email filing unless the notice or assessor confirms it for your specific appeal.

What happens after

First, the Board of Tax Assessors acknowledges your appeal and an appraiser reviews the file. Cobb’s appeal summary says the BTA renders a decision and notifies the owner in writing within 180 days; if a certified appraisal was submitted with the appeal, the response timeline can be shorter.

If the assessor changes the value, you get written notice. If you are still dissatisfied, you must file a written request within 30 days to continue to the Board of Equalization. If the assessor makes no change, Cobb says the appeal is automatically forwarded to BOE.

The proper hearing body for the typical homeowner is the Cobb County Board of Equalization, managed by the Cobb County Superior Court Clerk, not the Tax Assessor. BOE hearings are public. A county appraiser attends and presents the county’s evidence; you or your authorized representative present your evidence; both sides may make closing statements; then the three-member citizen board deliberates and gives a decision. Cobb’s BOE office is at 10 East Park Square, Building C, 1st Floor, Marietta, GA 30090, and BOE email is boe@cobbcounty.org.

If you cannot attend, ask for the one-time reschedule in time. Cobb’s BOE page says failure to appear results in “No Change in Value.” You may also present written evidence; Cobb’s FAQ notes the appeal-value freeze can apply where a taxpayer files written evidence to the BOE, hearing officer, or arbitrator and receives a reduction.

After a BOE or hearing-officer decision, either side may appeal to Cobb Superior Court within 30 days. Cobb lists a Superior Court appeal filing fee of $25, subject to change.

Local tips

Check homestead before you appeal. For 2026, Cobb’s assessment notice page says homestead applications or removals must be handled before the July 20 appeal deadline. Cobb’s basic homestead exemption, floating homestead protection, age-62 school tax exemption, age-65 exemptions, disability exemptions, disabled-veteran exemptions, and surviving-spouse exemptions are worth reviewing with the Tax Commissioner. The age-62 school exemption can be especially valuable because school millage is the largest part of the unincorporated Cobb rate.

Use Cobb’s 2026 Property Tax Estimator, but remember it is an estimate. It uses current assessment data and 2025 adopted millage rates; it does not include city taxes. If you live in Marietta, Smyrna, Kennesaw, Acworth, Austell, Powder Springs, or Mableton, check your city tax situation separately.

Finally, be specific. “My taxes are too high” is weak. “The county used 2,900 square feet, but the appraisal and floor plan show 2,520,” or “the county value is $525,000, but four similar pre-January 1 sales in the same area support $475,000 to $485,000” is the kind of Cobb appeal a reviewer or BOE panel can actually act on.