Whether you’re a first-time buyer in Lawrenceville or a long-time homeowner in Duluth, knowing how Gwinnett County property taxes work is a practical part of managing the cost of homeownership. Property taxes fund local schools, public safety, fire protection, and infrastructure. They also flow directly into your monthly mortgage payment if your lender escrows them.
This guide covers current 2025 millage rates, due dates, city-level comparisons, exemptions that can lower your bill, and what to do if you think your assessment is too high.
How Property Taxes Are Calculated in Gwinnett County
Georgia law requires that most real property be assessed at 40% of fair market value as of January 1 each year. That figure is your assessed value. Your tax bill is calculated by applying a millage rate to that assessed value.
One mill equals $1 of tax for every $1,000 of assessed value.
Here’s a straightforward example using 2025 figures:
| STEP | EXAMPLE |
|---|---|
| Fair Market Value | $450,000 |
| Assessed Value (40%) | $180,000 |
| Millage Rate (county + schools, unincorporated) | ~30.00 mills |
| Gross Tax Before Exemptions | $5,400 |
| Standard Homestead Exemption Savings | ~$360 |
| Estimated Net Tax | ~$5,040 |
Your actual bill will vary based on your property’s assessed value, whether you live in an incorporated city, which school district serves your area, and any exemptions you qualify for.
2025 Millage Rates in Gwinnett County
Gwinnett County sets separate millage rates for county operations and schools. If you live within an incorporated city, your city adds its own millage on top of the county and school rates.
County and School Millage Rates (2025)
| TAXING AUTHORITY | 2025 MILLAGE RATE |
|---|---|
| Gwinnett County | 6.95 |
| Gwinnett County Public Schools | 18.70 |
| School Bond | 1.45 |
| Recreation | 1.32 |
| Total Base Rate (Unincorporated) | 34.86 |
Unincorporated Gwinnett homeowners also pay Fire/EMS (2.90), Police (0.36), and an Economic Development levy (0.33) on top of the base, bringing the full unincorporated total to 34.86 mills.
2025 Total Millage Rates by City in Gwinnett County
Homeowners in incorporated cities pay a different total rate because city services replace some county service levies. The figures below reflect the total millage rate for a typical residential property in each city.
| CITY | TOTAL 2025 MILLAGE RATE | NOTES |
|---|---|---|
| Unincorporated Gwinnett | 34.86 | Includes county Fire/EMS and Police levies |
| Lawrenceville | 31.60 | No county Fire/EMS or Police levy |
| Duluth | 31.60 | No county Fire/EMS or Police levy |
| Suwanee | 31.60 | No county Fire/EMS or Police levy |
| Snellville | 31.60 | No county Fire/EMS or Police levy |
| Norcross | 31.60 | No county Fire/EMS or Police levy |
| Lilburn | 31.60 | No county Fire/EMS or Police levy |
| Peachtree Corners | 34.50 | Includes Recreation levy; no city police/fire levy |
| Sugar Hill | 34.50 | Includes Recreation levy |
| Dacula | 34.50 | Includes Recreation levy |
| Grayson | 36.485 | Includes city Dev/Code Enforcement levy of 1.985 |
| Berkeley Lake | 35.694 | Includes city levy of 1.194 |
| Buford | 14.35 | Operates its own school system; Gwinnett school millage does not apply to in-city Buford properties |
Source: Gwinnett County Tax Commissioner, 2025 Millage Rate Table. CID (Community Improvement District) rates are not reflected above as they apply to specific commercial zones, not standard residential properties.
A note on Buford: Properties inside Buford city limits are served by the Buford City School System rather than Gwinnett County Public Schools. As a result, the 18.70 Gwinnett school millage does not apply, which is why Buford’s total rate is dramatically lower than the rest of the county. If you are buying in Buford, confirm whether your specific parcel falls within city limits.
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When Are Gwinnett County Property Taxes Due?
Property tax bills in Gwinnett County are typically mailed in August or September. For the 2025 tax year, the due date is November 15.
| MILESTONE | DATE |
|---|---|
| Bills Mailed | August or September |
| Due Date | November 15, 2025 |
| Interest Begins | November 16, 2025 |
| Penalty Added | 120 days after due date |
One important note: the Gwinnett County Tax Commissioner does not send bills directly to mortgage servicers. If your taxes are escrowed, your lender can look up your account, but it remains your responsibility to confirm payment was made. Check your escrow account statement or contact your servicer around October to verify.
What Happens If You Miss the Due Date?
Late payments trigger immediate costs that compound over time.
Interest begins accruing at 0.88% per month starting the day after the due date, and again on the second day of each month thereafter. After 120 days, a 5% penalty is added to the remaining balance. That penalty increases by another 5% every 120 days, up to a maximum of 20%.
Continued nonpayment can result in a tax lien being placed on the property and ultimately a tax sale if the lien is not redeemed. If you’re having trouble paying, contact the Tax Commissioner’s Office early. Waiting makes the situation more expensive and harder to resolve.
How to Pay Gwinnett County Property Taxes
You have several options for paying your bill.
Online: Pay by eCheck, debit card, or credit card at the Gwinnett County Tax Commissioner’s website. Processing fees apply to card payments; eCheck is typically lower cost.
By mail: Send a check or money order with your payment stub to the Tax Commissioner’s Office. Mail early to avoid any delays that could result in a late penalty.
In person: Visit a Gwinnett County Tax Commissioner office during regular business hours (8 a.m. to 5 p.m., Monday through Friday, excluding holidays). Contact the office at (770) 822-8800 or tax@gwinnettcounty.com to confirm current locations.
Through escrow: If your mortgage servicer handles your taxes, verify payment was submitted before the due date.
Homestead Exemptions: How to Lower Your Tax Bill
Gwinnett County offers several exemptions that can meaningfully reduce your property tax liability. The most important one for new homeowners is the standard homestead exemption.
Standard Homestead Exemption
If your primary residence is in Gwinnett County, you qualify for the standard homestead exemption. It reduces your assessed value for purposes of calculating county and school taxes.
| EXEMPTION APPLIED TO | ASSESSED VALUE REDUCTION |
|---|---|
| County Tax | $10,000 |
| School Tax | $4,000 |
Deadline to apply: April 1 to receive the exemption for that tax year. Applications submitted after April 1 take effect the following year.
Estimated Savings for a First-Time Buyer
Here’s how the homestead exemption affects a typical first-time buyer scenario:
| WITHOUT EXEMPTION | WITH EXEMPTION | |
| Home Market Value | $350,000 | $350,000 |
| Assessed Value (40%) | $140,000 | $140,000 |
| County Exemption Reduction | -- | $10,000 |
| School Exemption Reduction | -- | $4,000 |
| Net Assessed Value (County) | $140,000 | $130,000 |
| Net Assessed Value (School) | $140,000 | $136,000 |
| Estimated Annual Savings | -- | $200-$400+ |
Additional Exemptions
Gwinnett County offers additional exemptions for qualifying homeowners, including senior exemptions such as the L5A, which eliminates school taxes for homeowners 62 and older who meet income thresholds, disabled veteran exemptions, and surviving spouse exemptions. Contact the Tax Commissioner’s Office or visit their website to confirm current eligibility requirements and application deadlines.
How to Dispute Your Gwinnett County Property Tax Assessment
If you believe your property has been assessed above fair market value, you have the right to appeal. The process is more accessible than most homeowners realize.
Step 1: Review Your Notice of Assessment
Each year, the Board of Assessors sends a Notice of Assessment showing your property’s estimated fair market value. This is not a tax bill. It is the starting point for your tax calculation and the document you use to initiate an appeal if you disagree.
Step 2: File Within 45 Days
You have 45 days from the date printed on your Notice of Assessment to file an appeal. Missing this window forfeits your right to challenge that year’s assessment.
Step 3: Gather Comparable Sales Data
Your appeal will be stronger with evidence. Pull recent sales of similar properties in your neighborhood from public records or a real estate website. If your home’s assessed value is higher than what comparable homes are actually selling for, that gap is your argument.
Step 4: Choose Your Appeal Method
Gwinnett County offers three appeal options: an appeal to the Board of Assessors, a hearing before the Board of Equalization (a panel of citizen volunteers), or binding arbitration. Most homeowners start with the Board of Assessors, which is the simplest path.
What Happens During an Appeal
While your appeal is pending, Georgia law requires that you be billed at the lower of 85% of the current year’s assessment or 100% of the prior year’s assessment. You won’t overpay while waiting for a resolution.
If your appeal is successful, your assessed value is reduced and you receive a refund for any overpayment.
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Frequently Asked Questions
When are Gwinnett County property taxes due?
Bills are mailed in August or September and are due November 15 for the 2025 tax year. Interest begins accruing the following day.
How is property tax calculated in Gwinnett County?
Your home’s fair market value is assessed at 40%, then multiplied by the applicable millage rate. Your total rate depends on whether you live in an incorporated city and which school and special districts apply.
What is the homestead exemption in Gwinnett County?
The standard exemption reduces your assessed value by $10,000 for county taxes and $4,000 for school taxes. Apply by April 1 through the Tax Commissioner’s Office to receive it for the current year.
How do I dispute my property tax assessment?
File an appeal within 45 days of the date on your Notice of Assessment. Bring comparable sales data to support your case. During the appeal, you are billed at the lower of 85% of the current assessment or 100% of the prior year’s.
What happens if I miss the due date?
Interest accrues at 0.88% per month starting the day after the deadline. A 5% penalty is added after 120 days, escalating every 120 days to a maximum of 20%. Continued nonpayment can result in a lien and tax sale.
Does Gwinnett County send tax bills to mortgage companies?
No. Your servicer can look up your account, but it is your responsibility to confirm payment was made before the due date.
Want to Learn More?
Property taxes are a significant ongoing cost in Gwinnett County, and understanding how assessed value, exemptions, appeals, and due dates work can help you budget confidently. At JVM Lending, we help Georgia homebuyers and homeowners understand how property taxes fit into mortgage payments and long-term plans. Whether you are buying in Suwanee or refinancing in Lilburn, we are here to guide you.
Contact JVM Lending today at (855) 855-4491 or email hello@jvmlending.com to get started.
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Please note: The information in this post is for educational purposes only. JVM Lending is not a tax professional or financial advisor. Property tax laws can be complex and vary by location and circumstance. Consult a certified tax professional for personalized guidance. If you need a referral, contact us and we’ll connect you with a trusted professional in our network.
