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///GEORGIA · COUNTY GUIDE

Property Tax Appeals in Gwinnett County, Georgia (2026)

The 2026 deadline to appeal a Gwinnett County property tax assessment is June 29, 2026. The filing window runs from May 15, 2026 to June 29, 2026.

For an annual assessment appeal in Georgia/Gwinnett County, file within 45 days of the date located in the upper right-hand corner of the assessment notice; online appeals must be submitted by 11:59pm on the appeal deadline, and mailed appeals must be postmarked by the deadline.

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Gwinnett County appeal, at a glance

Gwinnett County, Georgia property tax appeals at a glance
2026 appeal deadlineJune 29, 2026
Filing window opensMay 15, 2026
File withGwinnett County Board of Tax Assessors / Gwinnett County Assessors’ Office, 75 Langley Drive, Lawrenceville, GA 30046
Governing jurisdictionGwinnett County Board of Assessors
After a successful appealThe reduced value is frozen for the two following tax years (O.C.G.A. §48-5-299(c)).
Can a board raise the value?Yes — see below (O.C.G.A. §48-5-311)
Deadline sourceHow to Read Your Gwinnett County Annual Notice of Assessment — 2026 Assessment Explanation
Last verifiedAugust 16, 2026

When is the 2026 appeal deadline in Gwinnett County?

The 2026 deadline is June 29, 2026. The window opens May 15, 2026. For an annual assessment appeal in Georgia/Gwinnett County, file within 45 days of the date located in the upper right-hand corner of the assessment notice; online appeals must be submitted by 11:59pm on the appeal deadline, and mailed appeals must be postmarked by the deadline.

Who do I file with?

Appeals are filed with the Gwinnett County Board of Tax Assessors / Gwinnett County Assessors’ Office, 75 Langley Drive, Lawrenceville, GA 30046. The governing jurisdiction is the Gwinnett County Board of Assessors.

How the appeal process works in Georgia

Georgia counties mail an Annual Notice of Assessment, and an appeal must be filed within 45 days of the notice date (O.C.G.A. §48-5-311). Appeals go to the county Board of Assessors and, if not resolved there, to the Board of Equalization — most settle on the evidence, and Georgia allows remote hearings. A successful appeal freezes the reduced value for the two following tax years (O.C.G.A. §48-5-299(c)), so one appeal can lower the bill for three.

Can an appeal raise my assessment?

Yes, it's possible — a Georgia Board of Equalization may increase, decrease, or sustain an assessed value on appeal (O.C.G.A. §48-5-311). That's why we check for that exposure before filing: we don't file when we see it, and if it surfaces after filing we withdraw. We'd rather lose the case than leave you worse off than when you started.

FAQ

When is the 2026 property tax appeal deadline in Gwinnett County?
The 2026 deadline is June 29, 2026. The window opens May 15, 2026. For an annual assessment appeal in Georgia/Gwinnett County, file within 45 days of the date located in the upper right-hand corner of the assessment notice; online appeals must be submitted by 11:59pm on the appeal deadline, and mailed appeals must be postmarked by the deadline.
Who hears property tax appeals in Gwinnett County?
Appeals are filed with the Gwinnett County Board of Tax Assessors / Gwinnett County Assessors’ Office, 75 Langley Drive, Lawrenceville, GA 30046. The governing jurisdiction is the Gwinnett County Board of Assessors.
What does it cost to appeal with Castellan?
Nothing up front. $0 upfront. Our fee is 35% of your first-year savings, only if we win. If your properties with Castellan are assessed at more than $5 million combined, your rate is 30% on everything. The same schedule applies in every state we serve, and it is in the agreement in front of you before you sign. If we don't win, you pay nothing.
Can an appeal raise my assessment?
Yes, it's possible — a Georgia Board of Equalization may increase, decrease, or sustain an assessed value on appeal (O.C.G.A. §48-5-311). That's why we check for that exposure before filing: we don't file when we see it, and if it surfaces after filing we withdraw. We'd rather lose the case than leave you worse off than when you started.
Does Castellan handle appeals in Gwinnett County?
Serving California, Georgia, and Florida. Enter your address and we'll tell you either way — if it's outside what we cover today, you'll hear that plainly.

Sources

Last verified August 16, 2026.

Know where you stand.

Enter your address and we'll check Gwinnett County's own records at no cost. If there's no case, we'll tell you that too.

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Serving California, Georgia, and Florida.

Georgia property tax appeals. Any estimate is based on county assessment data and public records and is not a guarantee of any outcome. Representation and fee terms are provided in writing before any filing. Deadline information reflects published county materials as of the date shown above — verify with the Gwinnett County Board of Tax Assessors / Gwinnett County Assessors’ Office, 75 Langley Drive, Lawrenceville, GA 30046 before relying on it.