Georgia homeowners who win a property tax appeal may save hundreds a year, and if the value is reduced, the 299(c) hold can keep that saving for up to three years, subject to the statutory exceptions. See millage data, Gwinnett outcomes, HB 581 changes.
# Lower an Overblown Georgia Assessment Before Your Appeal Deadline
Your assessment notice just arrived, and the number looks wrong. Maybe your county says your home is worth $50,000 more than last year. Maybe the figure doesn't match a single recent sale on your street.
Georgia law sets the deadline to challenge it at 45 days from the date printed on that notice. If you miss it, you cannot appeal that year's value. Your own count of the last day is an estimate. Confirm with your county before you file.
This guide covers the math: how Georgia assessments work, county-by-county millage rates, appeal outcome data from Gwinnett County, the 2025 HB 581 freeze rule changes, and a dollar-by-dollar breakdown of whether appealing makes financial sense for your home.
Your annual notice lists three numbers that matter: the fair market value (FMV) your county assessor assigned, the assessed value (40% of FMV for most Georgia property), and the millage rates applied by your taxing jurisdictions.
Georgia assesses most property at 40% of fair market value under O.C.G.A. section 48-5-7. The formula for your tax bill:
Tax Bill = FMV x 0.40 x (Total Millage / 1,000)
Here's what that looks like for a $400,000 home in unincorporated Gwinnett County:
Assessments spike for three common reasons:
The fastest check: compare your notice's FMV to recent closed sales of similar homes within a half-mile. If comparable sales don't support the assessor's number, you likely have a case.
The clock starts on the date printed on your notice, not the date it landed in your mailbox. You file by submitting Form PT-311A to your County Board of Tax Assessors (not the state Department of Revenue).
Key facts about filing:
After you file, the assessors may change your value. If they do, they mail a change notice (the state's form is the PT-306-30). If you disagree, you have 30 days from the date it was mailed to tell the assessors in writing that you are continuing your appeal. The last date printed on the notice governs; any date you count out yourself is only an estimate. Confirm with your county before you file. If you are happy with the new value, read the next section before you let it stand.
Georgia's O.C.G.A. section 48-5-299(c) has long been the most powerful tool for property owners. Until 2025, an appeal that ended with no change could still lock in your assessed value. HB 581 changed that.
Pre-2025 rules: An appeal could hold your assessed value for 3 years (the appeal year plus the next two years), even if you didn't win a reduction. The statute triggered as long as your value was "reduced or unchanged." That encouraged filing just to hold the value.
Post-2025 rules (HB 581): The words "or is unchanged" were struck from the statute, so you must win an actual reduction to get the hold. A no-change result, whether from the assessors or the Board, starts no hold. The length did not change: when an appeal lowers a property's value, by a Board, hearing officer, arbitrator or court decision, or by a written agreement signed by the assessors and the owner or the owner's authorized agent, the assessors cannot raise that lower value for the next two years. That is still 3 years counting the appeal year. The full 299(c) freeze mechanics are covered here.
Why this matters for your decision: Under the old system, even a weak case was worth filing for the freeze alone. Under the new rules, you need evidence strong enough to actually win. But if you do win, the math still compounds in your favor.
Example: A $400,000 home in Gwinnett County wins a 12% reduction (new FMV: $352,000). Assume that the reduced value holds, subject to the statutory exceptions, that without the hold the county would have pushed the value to $420,000 in each of the next two years, and that millage stays at about 34.86 mills.
The revised-value trap: If the assessors send you a lower value before a hearing and you are happy with it, know this: the state's change notice says that if you agree with the adjusted value, no action is required, and your bill will be based on it. Doing nothing is not a signed agreement, though. If you want the revised value held for the next two years, ask the assessors for a written agreement signed by both sides while your appeal is still open. A signed value agreement carries the hold unless both sides waive it in writing, and you do not need a hearing to get one. Some counties put a settlement on their own form, often called an appeal waiver and release. These forms can offer one option that fixes the value for the appeal year and the next two years, and another that leaves the value open to change later, which gives up the hold. Before you sign, check the value, the tax years listed, which option is marked, and that both sides sign. Understanding when to accept vs. continue is critical.
A 10% assessment reduction doesn't produce the same dollar savings in every county. Millage rates, the tax rate per $1,000 of assessed value, determine how much each dollar of overassessment costs you.
Millage varies by city, school district, and special tax district. Rates shown are approximate totals for unincorporated areas. See the full county millage table for your specific jurisdiction.
If the value is reduced, the 299(c) hold covers the appeal year and the next two years, subject to the statutory exceptions, so at unchanged millage the yearly saving can repeat in each of those years. A 10% reduction in DeKalb County is worth an estimated $2,112 over three years if the reduced value holds, subject to the statutory exceptions. A 15% reduction in Fulton totals an estimated $2,556.
There is no single statewide figure for how Georgia appeals turn out. Gwinnett County's records give one county's picture:
Source: Gwinnett County public records request, 2025 tax year.
These are Gwinnett numbers, not a Georgia average, and your county may differ. Evidence quality, not luck, is the differentiator.
For a reduction decided at a hearing, the freeze does not apply if you or your representative failed to attend the hearing or provide the Board of Equalization, hearing officer, or arbitrator with some written evidence supporting your opinion of value. Counties read this rule differently, and some require attendance, so if you can, attend (or send a representative) and submit written evidence.
For a deeper analysis of how these numbers apply to different property types and counties, see Property Tax Appeal Odds.
An AppealAlly DIY evidence packet costs $79. Here's how small a reduction you need to recoup that investment, and then some:
Range reflects lowest (Forsyth, ~26.5 mills) to highest (DeKalb, ~44.0 mills) total millage among major metro Atlanta counties. If the value is reduced, the 299(c) hold covers the appeal year and the next two years, subject to the statutory exceptions, so at unchanged millage the yearly figure can repeat in each of those years.
Conservative scenario: A 5% reduction on a $400,000 Gwinnett home saves an estimated $279 per year. Over three years, if the reduced value holds, subject to the statutory exceptions, and millage stays the same, that's an estimated $837 in total savings.
Moderate scenario: A 10% reduction on the same home saves an estimated $558 per year. Over three years, if the reduced value holds, subject to the statutory exceptions, and millage stays the same: an estimated $1,673.
What about risk? On appeal, your value can be lowered but cannot be raised above what the assessors set, unless you filed the appeal while a 299(c) hold was in effect on that value. If your value is not under a hold, the realistic worst case is that it stays the same and you're out only the time you invested.
To estimate what a reduction would mean for your specific property, try our savings calculator.
1. Letting a revised value stand without a signed agreement. If the assessors mail a change notice (the state's form is the PT-306-30) with a lower value you can accept, doing nothing is not a signed agreement, and it is not clear the hold applies. While your appeal is still open, ask for a written agreement at that value, signed by the assessors and you. If the revised value is still too high, tell the assessors in writing within 30 days of the date the notice was mailed that you are continuing your appeal. The last date printed on the notice governs, and your own count is an estimate. Confirm with your county before you file.
2. Using asking prices instead of closed sales. Zillow estimates, Redfin listings, and "for sale" prices carry zero weight at a BOE hearing. What matters: actual closed sales within the past 12 months.
3. Missing the appeal deadline. Georgia law sets the appeal deadline at 45 days from the date printed on your notice, not the day it arrives. File early and confirm receipt with your county. The date printed on your notice controls. Confirm with your county before you file.
4. Skipping the hearing or the written evidence. For a reduction decided at a hearing, the freeze does not apply if you or your representative failed to attend the hearing or provide the Board of Equalization, hearing officer, or arbitrator with some written evidence supporting your opinion of value. Counties read this rule differently, and some require attendance, so if you can, attend (or send a representative) and submit written evidence. An owner can appear before the Board in person, through an authorized agent, or both, and the Board can hold the hearing by audio or video if everyone agrees.
5. Filing emotional arguments instead of comparable sales data. "My taxes are too high" is not evidence. Three to five comparable sales with adjustments for differences in size, age, and condition: that's evidence. For help structuring your argument, see our PT-311A appeal letter template.
6. Not understanding the HB 581 freeze changes. The 299(c) freeze now requires a real win. Filing without preparation to "lock in" your value no longer works. Budget your time for evidence gathering before you file.
Not sure where you stand? Check your estimated savings: enter your address and assessed value, and we'll show you what a successful appeal could be worth.
Can the county raise my assessment if I appeal? On appeal, your value can be lowered but cannot be raised above what the assessors set, unless you filed the appeal while a 299(c) hold was in effect on that value. If your value is not under a hold, the worst outcome is no change.
What if I lose my appeal? If your value was not under a 299(c) hold when you filed, it stays at the value on your notice. If you appealed a value that was already under a hold, the appeal can move it up or down on the evidence, unless both sides agree otherwise in writing. You owe $0 in filing fees for BOE appeals. The only cost is the time you spent preparing and attending the hearing.
BOE vs. Hearing Officer vs. Arbitration: which should I choose? For most homeowners, the county Board of Equalization is the standard path. It hears value, uniformity, taxability and denied exemptions. The hearing officer route is open to nonhomestead real property with a fair market value over $500,000 as shown on the annual assessment notice, and to contiguous nonhomestead property the same owner holds. A hearing officer decides value and uniformity. Nonbinding arbitration is open to any owner on value only. The PT-311A notes that additional costs or fees may apply for some routes.
Can I appeal if my assessment didn't change from last year? Yes, you can challenge your assessed value any year you receive a notice. However, under HB 581, the three-year 299(c) hold only starts if you win an actual reduction from the value on your notice. Be careful if your value is unchanged because it is already under a hold: if you appeal a value that is already under a hold, the appeal can move the value up or down on the evidence, unless both sides agree otherwise in writing. A new appeal during the two years can also end the hold early.
What if I missed the appeal deadline? If the appeal deadline on your notice has passed, you cannot appeal this year's assessment. Start planning for next year: file your homestead exemption if you haven't already and begin gathering comparable sales data.