The Gwinnett County Board of Assessors determines the value of every piece of real estate in the county. That value drives your property tax bill. Understanding the assessment process — how values are set, when notices go out, and what to look for — helps you catch errors and decide whether to appeal.
Key Points
- •The Board of Assessors determines fair market value; it does not set tax rates.
- •Assessed value is 40% of fair market value under Georgia law.
- •Annual assessment notices show your current and prior-year values.
- •Assessors use mass appraisal — computer-assisted models — which can sometimes miss individual property details.
- •Review your notice each year to catch errors before the appeal deadline passes.
Who Assesses Property in Gwinnett County?
The Gwinnett County Board of Assessors is an independent body responsible for determining the fair market value of all real and personal property in the county. The Board does not set tax rates or collect taxes — it only determines values. The Gwinnett County Tax Commissioner uses those values to calculate and collect your tax bill.
How Values Are Determined
Assessors use three standard appraisal approaches:
- Sales comparison approach — compares your property to recent sales of similar properties in your area. This is the most common method for residential property.
- Cost approach — estimates what it would cost to replace the structure, minus depreciation, plus land value. Often used for new or unique construction.
- Income approach — used primarily for commercial and investment properties, based on the income the property generates.
Fair Market Value vs. Assessed Value
- Fair market value — the assessor's opinion of what your property would sell for in an arm's-length transaction.
- Assessed value — 40% of fair market value, as required by Georgia law (O.C.G.A. § 48-5-7). This is the number the millage rate is applied to.
The Annual Assessment Notice
Each year, the Board of Assessors sends an annual notice of current assessment to property owners. This notice shows:
- The current fair market value
- The assessed value (40%)
- The prior year's values
- Whether the value changed from the prior year
- Information about your right to appeal
Review this notice carefully. If the market value seems too high, or if the description of your property is wrong (wrong square footage, wrong lot size, incorrect condition), you may have grounds for an appeal.
Property Records and the Tax Digest
The Board of Assessors maintains the tax digest — the complete list of all taxable property in Gwinnett County. The digest is used to calculate the total tax base, which helps taxing authorities set millage rates that generate the revenue they need.
Mass Appraisal and Automated Valuation
Gwinnett uses mass appraisal techniques — computer-assisted valuation models that analyze sales data and property characteristics across the entire county at once. While efficient, mass appraisal can sometimes miss individual property nuances, which is why the appeal process exists.
Where to Find Your Assessment
You can look up your property's assessment on the Board of Assessors website. You will need your parcel number or property address.
Why It Matters to Gwinnett Residents
Your property's assessed value is the single biggest factor in your tax bill. An inflated assessment means you pay more every year until it is corrected. Gwinnett's rapid growth has pushed values up, making it more important than ever to review your assessment.
