Gwinnett County Property Tax Appeal: How to Do It Yourself
If your Gwinnett County assessment notice shows a value that seems too high, you can appeal it — free, on your own, without hiring a company. The Board of Assessors handles valuations; the Board of Equalization hears appeals. This guide covers the grounds for appeal, how to file, and what evidence actually helps.
Grounds for Appeal: What You Can Actually Argue
Georgia law recognizes three grounds for a property tax appeal. Most homeowners use one or more of these:
- Value: the assessed value exceeds what your property would realistically sell for on the open market — the most common ground, supported by recent comparable sales of similar nearby homes that sold for less.
- Uniformity: your property is assessed at a higher ratio to market value than comparable properties in the county — neighbors with similar homes assessed lower supports a reduction.
- Taxability: the property (or a portion of it) should not be subject to taxation — less common for standard residential homes, but relevant for certain exemptions or property types.
You can raise value and uniformity on the same appeal. Most homeowners filing on their own focus on value, backed by comparable sales.
How to File Your Appeal
Gwinnett County accepts appeals by mail and in person at the Board of Assessors office. Under Georgia law, you have 45 days from the date on your notice — miss that window and you lose your opportunity for that tax year. Your appeal must state the grounds you are using and your opinion of the correct value; you cannot simply say the value is too high without providing a number. The appeal form is at gwinnettcounty.com — confirm the current deadline there before filing, and keep a copy with your confirmation.
After filing, the Board of Assessors may review your appeal and offer an adjusted value before a BOE hearing is scheduled. Many appeals resolve at this informal stage. If you reject the adjustment or the Board does not change its value, your case proceeds to the BOE.
Evidence That Moves the Board of Equalization
Print everything — the BOE panel will not scroll through your phone. The most useful evidence for a residential value appeal:
- Three to five comparable sales from the past 12 months: homes similar in size, age, condition, and location that sold below the assessed value, pulled from public deed records, Zillow, or Redfin.
- A recent independent appraisal from a refinance or purchase carries real weight if the appraised value is below the assessment.
- Photos and repair estimates for condition problems the assessor may not know about: roof damage, foundation issues, HVAC age, water intrusion. The assessor typically values from the exterior and public records, so interior condition evidence can shift the number.
- For a uniformity argument: assessed values per square foot for comparable neighboring properties, pulled from Gwinnett County's public property records. A simple spreadsheet showing your per-square-foot figure versus neighbors is enough.
A reduction is not guaranteed — it depends on how well your evidence lines up with market data and the BOE panel's judgment. Strong, recent comps are the most reliable path.
Gwinnett Has Held Its County Rate Flat — Which Puts the Focus on Valuation
Gwinnett County's millage has been 6.950 in every year from 2020 through 2024 without a single change. School millage moved only slightly, from 19.700 to 19.100. If your Gwinnett tax bill has grown over those years — and for most owners it has — the rate is not what changed. The assessed value is, and that is the figure an appeal addresses.
Gwinnett also assesses comparatively close to the statutory figure. The Department of Revenue puts its average level of assessment at 38.89%, against a statutory 40% and a statewide median of 38.00%. That places Gwinnett 116 of 159 counties counted from the lowest level upward — in the upper third. A county that assesses close to the statute leaves less room for a uniformity argument based on the county average, which shifts the weight of a Gwinnett appeal onto the specifics of your own property: its condition, and how comparable homes nearby are actually valued.
| Year | County millage | School millage | Combined |
|---|---|---|---|
| 2020 | 6.950 | 19.700 | 26.650 |
| 2021 | 6.950 | 19.700 | 26.650 |
| 2022 | 6.950 | 19.200 | 26.150 |
| 2023 | 6.950 | 19.200 | 26.150 |
| 2024 | 6.950 | 19.100 | 26.050 |
What a reduction is worth here. At the statutory 40%, a $400,000 Gwinnett home is assessed at $160,000 before exemptions, and the combined 26.050 mills make that about $4,168 a year from the county and school levies together. A 10% reduction in market value takes roughly $417 off that, repeated in every year the lower value holds — and Georgia normally holds an appealed value for the two following tax years. Because the rate has been stable, the entire increase in recent bills traces back to valuation, which is the one component you are entitled to contest.
Gwinnett County Appeals: Practical Questions
My Gwinnett bill went up but the rate did not. How?
Because the bill is rate multiplied by assessed value, and only the value moved. Gwinnett's county millage was 6.950 in each year from 2020 to 2024. Any increase you have seen came from reassessment, which is exactly what an appeal puts in question.
Is an appeal harder in a county that assesses near the statutory level?
The county-average argument is weaker, yes. At 38.89% Gwinnett sits close to the 40% statute, so you cannot lean on a county-wide shortfall. What still works is the comparison against specific neighbouring properties and any condition issue a mass appraisal would not see.
What counts as a comparable property in Gwinnett?
Same submarket, similar age, size and condition, and sold recently in an arm's-length transaction. Subdivision matters more than distance here — two homes a mile apart in different developments can be poor comparables, while four houses on the same street are usually good ones.
What happens at a Board of Equalization hearing?
A short hearing, commonly under half an hour, before a panel of three. You present your evidence, the county presents its basis for the value, and the board decides. It is informal in tone and you do not need representation to appear.
Should I accept the county's offer if one comes before the hearing?
Judge it against what your own evidence supports, not against the original number. An offer that closes half the gap is worth taking when your comparables support roughly that much; it is worth declining when they support considerably more, because the hearing costs you nothing further.
Sources. Millage rates for 2020 through 2024 and the average level of assessment are published by the Georgia Department of Revenue in the 2024 Property Tax Administration Annual Report. The level of assessment is the average median ratio of assessed value to sale price; the rank is the county's position among all 159 Georgia counties, counted from the lowest level upward.