Cobb County, GA

Appeal your Cobb County property assessment

2026 assessment cycle. Updated July 8, 2026.

Cobb County's 2026 property tax appeal deadline is on or before July 20, 2026 for most parcels. Your assessment notice states your parcel's exact window. If your home is over-assessed, you file Form PT-311-A with the Cobb County Board of Tax Assessors. Filing is free, and this page covers the steps.

The 2026 deadline

Cobb County mailed most 2026 assessment notices on June 5, 2026, and Georgia law gives you 45 days from the mailing date to appeal (O.C.G.A. 48-5-311). That puts the deadline for most parcels at July 20, 2026.

Your notice states your parcel's exact appeal window; the mailing date printed on it governs. A mailed appeal counts by its USPS postmark. There are no extensions; the next chance after the window closes is the 2027 notice.

Where to file

File Form PT-311-A with:

Cobb County Board of Tax Assessors
736 Whitlock Avenue, Suite 200
Marietta, GA 30064

Mail your appeal (USPS postmark counts) or hand-deliver it to the address above. On the form, choose the Board of Equalization (BOE) as your appeal method. The BOE route is free and hears every ground you can raise.

How the appeal works

Georgia counties appraise your home at fair market value each year and compute the tax on 40 percent of that value (O.C.G.A. 48-5-7). An appeal challenges the fair market value itself.

There are two independent grounds: the value is higher than the market supports, or your assessment is out of line with comparable homes (uniformity, O.C.G.A. 48-5-311). Either can lower your bill, and one appeal can claim both.

The Cobb County Board of Tax Assessors reviews your appeal first. If it isn't resolved there, it goes to a Board of Equalization hearing automatically. The hearing is informal and built for homeowners.

A successful appeal generally locks the resulting value in place for three years (O.C.G.A. 48-5-299(c)), so a reduction won in 2026 holds through 2028.

What Parcel prepares

Parcel prepares the complete appeal packet for your home: the filing form filled in, comparable-property evidence, and a step-by-step guide with this deadline and filing address built in. You preview the numbers for your home before paying anything; the completed packet is a fixed $49.

Start at savewithparcel.com, or look at a sample completed packet first.

Common questions

When is the 2026 deadline?

On or before July 20, 2026. The 45-day clock runs from the mailing date on your assessment notice, and there are no extensions. Your assessment notice states your parcel's exact window.

What does it cost to file?

Nothing. The county charges no filing fee, and the Board of Equalization route is free. Parcel's completed packet, if you want it, is a fixed $49.

What form do I use?

Form PT-311-A, Georgia's statewide Appeal of Assessment form. Parcel's packet includes it filled in for your home.

Do I need a lawyer or an agent?

No. The Board of Equalization process is built for homeowners. You file the form, and the hearing is informal.