HonestCasa logoHonestCasa
All Tax Guides
Updated 2025 Tax Year

Cobb County
Property Tax Guide

Everything you need to know about property taxes in Cobb County, GA. Rates, due dates, exemptions, and how it affects your monthly payment.

10 Official Sources
8 min read
Calculate Your True CostMortgage Calculator
Quick Facts
Tax Rate
0.846% (0.846 mills)
1st Due
Dec 20
Exemptions
4+ Available
Section 1

How Property Tax Works

Cobb County, Georgia operates a comprehensive property tax system that serves as a primary funding source for essential county services, including public schools, emergency services, infrastructure maintenance, and local government operations. Property taxes in Cobb County are assessed annually based on the fair market value of real estate, with the county assessing properties at 40% of their fair market value as of January 1st each year.

The current effective tax rate in Cobb County is 0.846 mills (0.846%), which is applied to the assessed value after any applicable exemptions. This rate is competitive within the metro Atlanta region and reflects the county's commitment to maintaining high-quality services while keeping tax burden reasonable for residents. Property owners can expect their effective tax rate to vary slightly based on special district assessments and available exemptions, with many homeowners qualifying for the standard Georgia homestead exemption that can reduce their annual tax liability.

Section 2

What Makes Up Your Tax Bill

ComponentRate (Mills)Description
County General Fund0.846Basic county operations, services, and administration
School DistrictIncluded in baseCobb County School District operations and facilities
Special AssessmentsVariesFire districts, municipal services (if applicable)
Total Base Rate0.846Standard rate applied to assessed value

Note: The millage rate of 0.846 represents the combined rate for county and school district taxes. Additional special district assessments may apply to properties in specific service areas.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Cobb County, property taxes are due in two installments:

First Installment
Dec 20
Delinquent after Dec 10
Pro tip: If you pay through mortgage escrow, your lender splits these payments across your monthly mortgage. If you pay directly, set calendar reminders to avoid late penalties.
Section 4

Supplemental Tax Bills

Supplemental taxes in Cobb County are additional property tax assessments that occur when there are significant changes to a property's value or ownership outside the normal annual assessment cycle. Common triggers include new construction completion, major renovations that increase property value, subdivision of land, or changes in property use classification.

When supplemental taxes are levied, they are calculated based on the difference between the old assessed value and the new assessed value, prorated for the remaining months in the tax year. For example, if a $100,000 home improvement project is completed in July, the additional assessed value would be $40,000 (40% of improvement value). The supplemental tax would be calculated as: $40,000 × 0.00846 × 3/12 months = $84.60 for the remainder of that tax year.

Example Calculation

Property Value: $300,000

  • Assessed Value (40%): $120,000
  • Less Homestead Exemption: -$2,000
  • Net Taxable Value: $118,000
  • Annual Tax (0.846%): $998.28
  • Monthly Escrow: $83.19

Property Value: $600,000

  • Assessed Value (40%): $240,000
  • Less Homestead Exemption: -$2,000
  • Net Taxable Value: $238,000
  • Annual Tax (0.846%): $2,013.48
  • Monthly Escrow: $167.79

Property Value: $1,000,000

  • Assessed Value (40%): $400,000
  • Less Homestead Exemption: -$2,000
  • Net Taxable Value: $398,000
  • Annual Tax (0.846%): $3,367.08
  • Monthly Escrow: $280.59

See How Taxes Affect Your Payment

Property taxes are just part of your total monthly cost. Get the full picture.

Calculate Now
Section 5

Escrow & Property Taxes

Most mortgage lenders in Cobb County require borrowers to maintain an escrow account for property tax payments, particularly for loans with less than 20% down payment. Your lender will estimate your annual property tax liability and collect 1/12th of that amount with each monthly mortgage payment. The collected funds are held in escrow and the lender pays your property taxes directly to Cobb County when they become due in October.

Lenders typically review and adjust escrow accounts annually, which may result in changes to your monthly mortgage payment. Since Cobb County tax bills are mailed by August 15th and due by October 15th, lenders usually make payments in September or early October. You can verify that your taxes have been paid by checking the Cobb County property tax portal at https://www.cobbcounty.org/tax/property-tax, where you can view payment history and current account status for your property.

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
  • Plan ahead instead of being surprised by "shortage" letters
Section 6

Frequently Asked Questions

Q: When are Cobb County property tax bills due? A: Tax bills are mailed by August 15th each year and are due by October 15th. Payments must be received or postmarked by the due date to avoid penalties.

Q: What homestead exemptions are available? A: The standard Georgia homestead exemption provides a $2,000 reduction from county and school taxes for primary residences. You must own and occupy the property as of January 1st and file the application by the property tax return deadline.

Q: How is my property's assessed value determined? A: Cobb County assesses properties at 40% of fair market value as of January 1st each year. The Tax Assessor's office conducts periodic revaluations and considers recent sales, property improvements, and market conditions.

Q: Can I appeal my property assessment? A: Yes, you can appeal your assessment through the Cobb County Board of Equalization. Appeals must typically be filed within 45 days of receiving your tax notice.

Q: What happens if I pay my taxes late? A: Late payments incur penalties and interest charges. Properties with delinquent taxes may eventually face tax lien proceedings or tax sales.

Q: Can I pay my property taxes online? A: Yes, Cobb County offers online payment options through their official portal at https://www.cobbcounty.org/tax. Various payment methods are accepted including electronic check and credit card.

Q: Do I need to file annually for my homestead exemption? A: No, once approved, the homestead exemption automatically renews each year as long as you continue to own and occupy the property as your primary residence.

Q: How can I get information about my specific property tax account? A: Visit https://www.cobbcounty.org/tax or contact the Cobb County Tax Commissioner's office directly for account-specific information, payment history, and current balances.

Verified Sources

Backed by 10 Official Government Sources

Every fact in this guide is sourced from official county, state, and federal documents.

01
County
2025 cobb county property tax billcobbtax.gov
02
County
Cobb County Real Estate Taxesnacdashboard.nara.gov
03
County
Taxation | Cobb County Georgiacobbcounty.gov
04
Tax Doc
Property Taxes Overviewcobbtax.gov
05
Tax Doc
Tax bill deadline arrives Wednesdaycloud.communications.cobbcounty.gov
06
County
County Property Tax Facts Cobb - Department of Revenuedor.georgia.gov
07
Tax Doc
Property Tax Homestead Exemptions - Department of Revenuedor.georgia.gov
08
CARLA JACKSONcobbtax.gov
09
Tax Doc
Exemptions - Property Taxescobbtax.gov
10
Tax Doc
Pay Property Tax Online - Department of Revenue - Georgia.govdor.georgia.gov
All sources verified as of 2025 Tax Year

See the Full Picture of Your Home Costs

Property taxes are just one piece of homeownership. HonestCasa helps you understand your total monthly cost and explore safe ways to access your home equity.

Total Monthly Cost

Mortgage + taxes + insurance + HOA

Equity Growth

Track how your equity grows over time

Safe Equity Access

Options for projects or debt payoff

Run Your ScenarioTry Calculator

Free • No credit check • 2-minute estimate