How to Appeal Property Taxes in Gwinnett County, Georgia (2026 Guide)

Gwinnett County mailed 2026 Annual Notices of Assessment on May 15, 2026, and the county’s 45-day appeal deadline was June 29, 2026. File with the Gwinnett County Board of Tax Assessors through Gwinnett-Assessor.com, or mail/hand-deliver a PT-311A or signed disagreement letter to ATT: Appeals – Gwinnett County Assessors’ Office, 75 Langley Drive, Lawrenceville, GA 30046. The 2026 filing period is now closed, according to the county’s appeal-data page.

How assessments work in Gwinnett County

Gwinnett’s 2026 assessment cycle values real property as of January 1, 2026. The Board of Assessors mailed about 311,000 residential and commercial notices on May 15, 2026; the notice is not a tax bill, but it shows the county’s fair market value, prior-year value, exemptions/credits/preferential assessments, and the appeal deadline printed at the top of the notice.

Georgia law requires property to be appraised at fair market value each year. Gwinnett explains that changes commonly come from market conditions, such as sales in your neighborhood, or property changes like additions. The assessed value used for taxation is 40% of fair market value unless changed by appeal. In plain English: if the county says your house is worth $500,000, the starting assessed value is $200,000 before exemptions.

The Assessors’ Office says it updates values across groupings such as neighborhood, property type, and use when market analysis shows values are out of line. Gwinnett’s 2026 notice also says the documents and records used to determine your 2026 value are available on request and must be provided within 10 business days. That is worth using before a hearing.

Whether you should appeal

Appeal if you can show one of Gwinnett’s accepted grounds: value, uniformity, taxability, exemption denied, breach/denial of covenant, or another ground listed on the PT-311A. For most homeowners, the strongest cases are usually:

• Market value is too high: similar homes that sold before January 1, 2026 support a lower value.
• Uniformity: comparable houses in your subdivision are assessed lower even after adjusting for size, condition, basement, lot, and renovations.
• County data is wrong: square footage, finished basement, bath count, condition, acreage, or quality grade is overstated.
• An exemption is missing or denied: especially if you occupied the home as of January 1.

Do not appeal just because the tax bill feels high. Gwinnett’s Board of Equalization page states that only sales before January 1 of the tax year will be considered at the hearing. Screenshots from Zillow can help you spot issues, but your evidence should be county records, MLS/closing data, photos, repair estimates, appraisal reports, or a clear comp grid.

I did not find an official Gwinnett-published residential appeal success rate or median reduction for the 2025 or 2026 cycle. Do not rely on marketing claims from appeal companies unless they show the underlying county data.

Step-by-step how to file

1. Read the top-right corner of your notice. For 2026, the sample and county pages show a notice date of May 15, 2026 and a last day to appeal of June 29, 2026. Online appeals had to be submitted by 11:59 p.m. Eastern on the deadline. Starting an online appeal before the deadline did not count unless it was completed and submitted.

2. Choose your filing method. Gwinnett accepts initial assessment appeals only by:

• Online portal: use Gwinnett-Assessor.com / the Assessors’ Office online portal.
• Mail: send the completed form or letter to ATT: Appeals – Gwinnett County Assessors’ Office, 75 Langley Drive, Lawrenceville, GA 30046.
• In person: deliver to the Assessors’ Office at 75 Langley Drive, Lawrenceville, GA 30046.

Gwinnett explicitly says the Board of Assessors does not accept initial appeals by email or fax. Mailed appeals must be postmarked by the deadline; near the deadline, use a trackable method or proof of timely mailing.

3. Use the right form—or a valid letter. The official form is PT-311A, Appeal of Assessment for Digest Year. Gwinnett will also accept a letter of disagreement if it identifies the property by parcel number or address and is received or postmarked within the 45-day period. The PT-311A requires your owner’s value assertion, appeal ground, property ID/account number, contact information, signature, and appeal route.

4. Pick the appeal route carefully. Most homeowners choose BOE: county board of equalization, because it covers value, uniformity, taxability, and exemption denial and has no additional taxpayer cost. Arbitration is for value only and requires a $25 Superior Court filing-fee check plus a certified appraisal within 45 days of filing the notice of appeal; the party farthest from the arbitrator’s value pays the arbitrator costs. Hearing officer appeals generally apply to non-homestead real property or wireless property with fair market value over $500,000.

5. Include evidence early. Attach a short explanation, 3–5 comparable sales before January 1, photos of condition problems, repair estimates, and any record-card corrections. If an agent signs for you, include written authorization.

What happens after

First, Gwinnett appraisal staff reviews your appeal. The appraiser may accept your value, issue a new proposed value, or make no change. If you receive an Amended Notice of Assessment (PY-306C), you have 30 days from the notice date to accept or reject it. If you do nothing, Gwinnett treats the amended value as accepted.

If no adjustment is made—or you reject the amended value—the appeal goes to the Gwinnett County Board of Equalization. The BOE is under the oversight and supervision of the Clerk of Superior Court, not the Tax Assessor. A BOE panel has three members appointed by the Grand Jury. Gwinnett says the panel hears evidence from both the property owner and the Assessors’ Office, then renders a decision; the court’s BOE page says the decision is rendered at the conclusion of the hearing and reduced to writing.

For the hearing, expect the county appraiser to present market/cost support for the county value. You present your evidence and explain your requested value. You may bring an agent, attorney, or appraiser if you notify the BOE in writing. Gwinnett asks hearing evidence to be submitted to BOEEvidence@gwinnettcounty.com at least seven days before the hearing. You get one reschedule if requested at least 48 hours before the hearing.

If you still disagree after the BOE decision, Gwinnett’s next local step is an Appeal Continuance / Settlement Conference. File that form within 30 days of the BOE decision with the Assessors’ Office. The 2026 form says the Board of Assessors has 45 days to notify you of a settlement conference, and the conference must occur no later than 30 days from the notification letter. Gwinnett offers Webex and in-person options; if you do not attend, the conference still occurs and the evidence already provided is reviewed. If no settlement is reached, you have 20 days to further certify the appeal to Superior Court and pay the filing fee.

If your tax bill is issued before the appeal is final, do not assume the appeal is over. Gwinnett says the Tax Commissioner may issue a temporary partial bill using the lesser of 100% of the prior-year value or 85% of the most recent value; pay it by the due date to avoid penalties while the final bill waits on the appeal result.

Local tips

Check homestead before you fight value. Gwinnett’s 2026 homestead rules are unusually important. The Tax Commissioner says homeowners who owned and occupied the home on January 1 may apply year-round, but to reduce current-year taxes the application must be received by the appeal deadline on the assessment notice. For 2026, that was June 29.

The basic S1R Regular Homestead Exemption has no age or income limit and, per the Tax Commissioner’s current 2026 page, includes $10,000 off assessed value for county, $8,000 off school, and $7,000 off recreation. Senior, disability, disabled-veteran, surviving-spouse, public-service-employee, and school exemptions may be worth much more. The Value Offset Exemption (VOE) is automatically applied when any homestead exemption is granted and freezes the assessed value for the county-tax portion only; schools and cities still use current assessed value.

Use the county’s actual rate when estimating savings. Gwinnett’s latest finalized published millage table is the 2025 table; the 2026 county millage was still in public-hearing/adoption mode as of July 23, 2026. For unincorporated Gwinnett, the 2025 total rate is 34.86 mills—county 6.95, school 18.7, school bond 1.45, recreation 1.0, fire/EMS 3.2, police 2.9, development/code enforcement 0.36, economic development 0.3. One mill equals $1 per $1,000 of assessed value.

Worked example: suppose your unincorporated Gwinnett home is noticed at $520,000, but good pre-January 1 comps support $480,000. A successful $40,000 fair-market-value reduction lowers assessed value by 40%, or $16,000. At 34.86 mills, estimated annual tax savings are $16,000 × 0.03486 = $557.76, before considering how exemptions, VOE, city taxes, or Buford/city billing change your actual bill.

Finally, preserve proof. Save the submitted portal confirmation, certified-mail receipt, hand-delivery copy, amended-notice response, and every evidence email. In Gwinnett, timeliness is not flexible.