The millage rate is the number that turns your property's assessed value into an actual tax dollar amount. In Gwinnett County, multiple taxing authorities each set their own millage rate, and those rates combine to form your total property tax bill. Understanding millage rates is essential to knowing whether your taxes are going up — and why.
Key Points
- •One mill = $1 per $1,000 of assessed value.
- •Your total bill combines county, school, and (if applicable) city millage rates.
- •Each authority sets its rate based on its budget and the total tax digest.
- •The rollback rate is the rate that keeps revenue flat — exceeding it is a tax increase.
- •Stable millage rates can still mean higher bills when property values rise.
What Is a Millage Rate?
A mill is $1 of tax per $1,000 of assessed value. If your property's assessed value is $100,000 and the millage rate is 10 mills, your tax is:
$100,000 ÷ 1,000 × 10 = $1,000
Georgia law (O.C.G.A. § 48-5-2) defines the mill as the standard unit for property tax rates.
The Combined Millage Rate
Your Gwinnett County tax bill combines millage rates from multiple authorities:
| Authority | What It Funds |
|---|---|
| Gwinnett County Board of Commissioners | County government, public safety, roads, parks, libraries |
| Gwinnett County Public Schools | K-12 education, teacher salaries, school facilities |
| Your city (if incorporated) | Municipal services — police, fire, parks, planning |
| Gwinnett County bonds (if any) | Voter-approved bond debt service |
Residents in unincorporated Gwinnett County typically pay county and school taxes only. Residents inside a city pay an additional city millage rate.
How the Millage Rate Is Set
Each taxing authority follows a similar process:
- Budget adoption — the authority (county commission, school board, or city council) adopts a budget for the upcoming fiscal year.
- Revenue calculation — the authority determines how much property tax revenue is needed to fund the budget, after accounting for other revenue sources (sales tax, fees, state funding).
- Millage rate setting — the authority divides the needed revenue by the total taxable assessed value in its jurisdiction (the tax digest) to calculate the millage rate.
- Public notice and hearings — Georgia law requires public notice and hearings before a millage rate can be adopted, especially when the rate exceeds the "rollback rate."
The Rollback Rate and Tax Increases
Georgia law (O.C.G.A. § 48-5-32.1) requires taxing authorities to calculate a rollback rate each year — the millage rate that would generate the same total revenue as the prior year, given changes in the tax digest.
- If an authority sets its rate at or below the rollback rate, it is not considered a tax increase.
- If an authority sets its rate above the rollback rate, it is effectively a tax increase and requires public hearings and a formal vote.
This is why you may see headlines about a "backdoor tax hike" — when property values rise and an authority keeps the same nominal millage rate, tax bills still go up. WorthFighting.org reports on these decisions closely.
Why Millage Rates Vary by City
Each Gwinnett city sets its own millage rate based on its budget, service level, and tax base. Cities with larger commercial tax bases (more businesses relative to residents) may be able to fund services with a lower residential millage rate. Cities with mostly residential tax bases may need a higher rate.
How to Find Your Millage Rate
Your property tax bill shows the millage rate for each taxing authority. You can also look up rates on the Gwinnett County Tax Commissioner's website.
Millage Rate vs. Assessment: What Controls Your Bill?
Your tax bill is the product of assessed value and millage rate. Both can change from year to year:
- Assessed value changes — driven by the Board of Assessors and market conditions.
- Millage rate changes — driven by budget decisions of each taxing authority.
A stable millage rate does not mean a stable tax bill if your assessed value increases. Conversely, a millage rate decrease may not lower your bill if your assessment rose significantly.
Why It Matters to Gwinnett Residents
Millage rate decisions are where elected officials directly determine how much you pay. Understanding the rollback rate concept helps you distinguish between a genuine tax cut and a political talking point. WorthFighting.org holds Gwinnett officials accountable on every rate vote.
