HonestCasa logoHonestCasa
Updated 2025 Tax Year

Gwinnett County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
20.81 mills (total combined rate) - $20.81 per $1,000 of assessed value
1st Due
Nov 15
Exemptions
4+ Available
Section 1

How Property Tax Works

Gwinnett County operates a property tax system that serves as a primary funding source for essential local services including public schools, county operations, public safety, and infrastructure maintenance. Property taxes in Gwinnett County are assessed annually based on the fair market value of real property as of January 1st, with the county's Board of Assessors determining property valuations.

The 2025 Gwinnett County property tax rate is tentatively set at 12.427 mills for the county levy, representing a 27.63% increase from the previous year. When combined with all six tax levies (including school districts and special assessments), the total millage rate reaches 20.81 mills. This translates to approximately $20.81 per $1,000 of assessed value. Georgia's assessment ratio for residential property is 40% of fair market value, meaning a home valued at $300,000 would have an assessed value of $120,000 before exemptions.

Section 2

What Makes Up Your Tax Bill

ComponentRate (Mills)Description
County General12.427Gwinnett County operations, public safety, infrastructure
School District~8.0Local school district operations and maintenance
State School0.25State-mandated education funding
Fire/EMSVariableEmergency services and fire protection
Special DistrictsVariableMunicipal services, improvement districts
Total Combined20.81All tax levies combined

Note: Rates are subject to final approval through public hearings. Individual property locations may have additional municipal or special district assessments that vary by area.

Section 3

When Are Property Taxes Due?

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

First Installment
Nov 15
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 Gwinnett County are triggered by changes in property ownership, new construction, or significant improvements that occur after the January 1st assessment date. When you purchase property or complete construction/renovations during the tax year, a supplemental assessment calculates the difference between the previous assessment and the new assessed value, prorated for the remaining months of the tax year.

For example, if you purchase a newly constructed home in July valued at $400,000 (assessed at $160,000) on property previously assessed at $50,000, the supplemental tax would be calculated on the $110,000 difference in assessed value, multiplied by the current mill rate, then prorated for 6 months (July-December). Using the 20.81 mill rate: ($110,000 ÷ 1,000) × 20.81 × 0.5 = $1,144.55 in supplemental taxes due.

Example Calculation

$300,000 Home Value

  • Market Value: $300,000
  • Assessed Value (40%): $120,000
  • Less Homestead Exemption: -$2,000
  • Net Taxable Value: $118,000
  • Annual Tax (20.81 mills): $2,455.58
  • Monthly Escrow: $204.63

$600,000 Home Value

  • Market Value: $600,000
  • Assessed Value (40%): $240,000
  • Less Homestead Exemption: -$2,000
  • Net Taxable Value: $238,000
  • Annual Tax (20.81 mills): $4,952.78
  • Monthly Escrow: $412.73

$1,000,000 Home Value

  • Market Value: $1,000,000
  • Assessed Value (40%): $400,000
  • Less Homestead Exemption: -$2,000
  • Net Taxable Value: $398,000
  • Annual Tax (20.81 mills): $8,282.38
  • Monthly Escrow: $690.20

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 Gwinnett County require property tax escrow accounts to ensure timely payment of property taxes. Your lender collects monthly escrow payments as part of your mortgage payment, typically 1/12th of the annual tax bill plus a small cushion. The lender pays your property taxes directly to the county when due - first installment in January and second installment by December 20th.

Lenders perform annual escrow analyses to adjust monthly payments based on actual tax bills and account balances. If your property taxes increase significantly, you may receive an escrow shortage notice requiring additional payments or higher monthly escrow amounts. You can verify your property tax information and payment status online at the official Gwinnett County Tax Commissioner portal: https://www.gwinnettcounty.com/web/gwinnett/departments/taxcommissioner/propertytax

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 property taxes due in Gwinnett County? A: Property taxes are due in two installments - the first in January and the second by December 20th of each tax year.

Q: What is the homestead exemption amount? A: The standard homestead exemption in Georgia provides a $2,000 reduction in assessed value for county and school taxes on your primary residence.

Q: How do I apply for homestead exemption? A: You must file the homestead application by January 1st of the tax year, and you must have owned the property on January 1st to qualify for that year's exemption.

Q: When do I need to file a property tax return? A: Property tax returns must be filed with the county tax office between January 1 and April 1 of each year.

Q: How can I appeal my property assessment? A: You can appeal your assessment with the county board of tax assessors. You'll receive an annual assessment notice with information on filing an appeal for real property.

Q: What happens if I pay my taxes late? A: Late payments incur penalties and interest charges. Contact the Tax Commissioner's office for specific penalty rates and payment options.

Q: Can I pay my property taxes online? A: Yes, you can pay property taxes online through the official county website at https://www.gwinnettcounty.com/web/gwinnett/departments/taxcommissioner

Q: How is my property value determined? A: The county board of tax assessors determines property values based on fair market value as of January 1st, with residential properties assessed at 40% of market value.

Q: What services do my property taxes fund? A: Property taxes fund public schools, county operations, public safety, fire/EMS services, infrastructure maintenance, and various special district services.

Q: Do I still owe taxes if I sell my property during the year? A: Tax obligations typically transfer to the new owner as of the closing date, but this should be clarified in your sales contract and closing documents.

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

Free • No credit check • 2-minute estimate