Gwinnett County Property Tax: Exemptions & Appeals (2026)

Direct answer: Gwinnett County mailed 2026 Annual Notices of Assessment on May 15, 2026, and the last day to appeal was June 29, 2026 — 45 days after the notice date. File with the Gwinnett County Board of Tax Assessors, preferably through the online portal at Gwinnett-Assessor.com, or by mail/in person at ATTN: Appeals – Gwinnett County Assessors’ Office, 75 Langley Drive, Lawrenceville, GA 30046. Gwinnett does not accept assessment appeals by email or fax.

How assessments work in Gwinnett County

Gwinnett reassesses taxable real property every year for fair market value as of January 1. For 2026, the notice reflects what the Board of Assessors believes your property would have sold for on January 1, 2026 — not what it is worth today, and not automatically your purchase price. The county says residential values are typically set using the sales comparison approach, with prior-year sales grouped by neighborhood, property type, and use; the cost and income approaches may be considered where appropriate.

Your tax bill is not based directly on the full fair market value. Georgia assesses property at 40% of fair market value. Gwinnett’s own formula is: Annual Property Tax = [(40% × Fair Market Value) – Exemptions] × Millage Rate. So a $500,000 fair market value generally starts as a $200,000 assessed value before exemptions.

The 2026 notice is also different from older Gwinnett notices. County FAQs say state legislation changed the notice format for 2026: estimated taxes, assessed values, and rollback estimates were removed, while estimated exemption savings were added. Do not rely only on the “tax savings” box; review the fair market value, reason for change, parcel details, and exemptions.

Whether you should appeal

Appeal if you can show one of these Gwinnett-recognized grounds:

• Value: the county’s fair market value is higher than what the property would likely have sold for on January 1, 2026.
• Uniformity: your property is assessed higher than similar properties in the same neighborhood or class.
• Taxability/exemption: the property should not be taxable as shown, or an exemption was denied.

Start with Gwinnett’s property search. The county specifically points homeowners to the QPublic property information search, including “Recent Sales In Area” and the “Comp Report Generator.” Use sales before January 1, 2026; the Gwinnett Board of Equalization page says only sales prior to January 1 of the tax year will be considered at the hearing.

Good appeal evidence in Gwinnett is practical: three to five nearby sales from 2025, your closing statement if you bought near January 1, photos of condition problems, repair estimates, a plat or property card correction, and screenshots showing comparable homes with lower assessed values. Weak evidence is “my taxes are too high” or “Zillow says less” without comps.

I did not find an official Gwinnett County page publishing residential appeal success rates, median reductions, or win rates. Treat any third-party success-rate claims as nonofficial unless the county releases the underlying data.

Step-by-step how to file

1. Read the notice date and deadline. For the main 2026 residential mailing, Gwinnett mailed about 311,000 notices on May 15, 2026. The sample 2026 notice and county appeal page show the deadline as 45 days from the notice date; for May 15 notices, the deadline was June 29, 2026. Online filings had to be submitted by 11:59 p.m. on the deadline.

2. Choose the form or portal. The official paper form is PT-311-A, Appeal of Assessment Form. Georgia’s Department of Revenue calls this the uniform appeal form; Gwinnett also hosts the same form. The form asks for the property type, parcel/account number, appeal grounds, your asserted value, and your appeal route.

3. Pick the appeal route. Most homeowners choose BOE: appeal to the county board of equalization with appeal to superior court. The PT-311-A also lists arbitration, hearing officer, and direct superior court with Board of Assessors consent. Arbitration can involve appraisal and arbitrator costs, so it is usually not the first choice for a standard owner-occupied home.

4. File for free. Gwinnett says there is no cost to file directly with the Assessors’ Office, online, in person, or by mail.

Filing methods:

• Online: use the real estate appeal portal linked from Gwinnett-Assessor.com. Finish the filing; Gwinnett has a written policy that an appeal started online but not submitted by the deadline is not timely.
• Mail: mail a completed PT-311-A or a letter of disagreement identifying the property to ATTN: Appeals – Gwinnett County Assessors’ Office, 75 Langley Drive, Lawrenceville, GA 30046. Mail must be postmarked by the deadline; use tracking and request a postmark if close to the deadline.
• In person/hand delivery: deliver to the Assessors’ Office at 75 Langley Drive, Lawrenceville, GA 30046. Ask for a stamped receipt copy if available.
• Not allowed: Gwinnett states the Board of Assessors does not accept assessment appeals by email or fax.

5. Attach enough evidence to be taken seriously. You can file first to preserve the deadline, but include comments and evidence if you already have them. If an agent signs for you, the PT-311-A says a letter of authorization must accompany the filing.

What happens after

First, Gwinnett appraisal staff reviews the appeal. An appraiser may accept your value, set a new proposed value, or make no change. If staff issues an Amended Notice of Assessment (PY-306C), you have 30 days from the notice date to accept or reject it. If you do nothing within 30 days, Gwinnett says the amended value becomes the default.

If there is no adjustment, or if you reject the amended value, the appeal goes to the Gwinnett County Board of Equalization. The BOE is overseen by the Clerk of Superior Court, not the Tax Assessor. Gwinnett describes BOE panels as three-person panels appointed by the Grand Jury; members must reside in and own property in the county and complete Georgia Department of Revenue training.

At the hearing, you present your evidence and the county appraiser presents the county’s support. Gwinnett offers hearings in person or by WebEx video conference. Submit BOE hearing evidence to BOEEvidence@gwinnettcounty.com at least seven days before the hearing. The BOE page says the board must render its decision at the conclusion of the hearing, reduce it to writing, and deliver it to the taxpayer by certified/registered mail or statutory overnight delivery.

If you lose at BOE, Gwinnett offers an Appeal Continuance Form to request a settlement conference within 30 days of the BOE decision letter. That form can be emailed to Assessors_Continuance@GwinnettCounty.com, mailed, or delivered to the Assessors’ Office. If no agreement is reached, you have 20 days to further certify the appeal to the Clerk of Courts and pay the filing fee.

If tax bills are issued before the appeal is final, you still must pay the temporary bill. Gwinnett’s Tax Commissioner says pending-appeal bills are calculated using the lesser of 85% of the current-year assessment or 100% of the prior-year assessment. A final bill, refund, or supplemental amount follows after the appeal is resolved.

Local tips

Check exemptions before you fight value. Gwinnett’s regular homestead exemption is for owners occupying the home on January 1 and, according to the Tax Commissioner, includes $10,000 off county assessed value, $8,000 off school, and $7,000 off recreation. Gwinnett’s Value Offset Exemption (VOE) is automatically applied when a homestead exemption is granted and holds the assessed value constant for the county portion of the bill; it does not apply to school or city taxes. Seniors should check the L5A Senior School Exemption, which for 2026 uses a $124,648 income threshold and can exempt school and school bond taxes for qualifying age-65 homeowners.

Use the right tax rate for savings estimates. As of July 25, 2026, Gwinnett’s 2026 county millage rates had not yet been adopted; the county scheduled consideration for August 4, 2026. The latest full official rate table available is 2025. For unincorporated Gwinnett, the 2025 total rate was 34.86 mills; the county-only rate for unincorporated property was 14.71 mills.

Worked example: Suppose your unincorporated Gwinnett home is noticed at $525,000, but 2025 comparable sales support $475,000. A $50,000 fair-market-value reduction lowers assessed value by 40%, or $20,000. At the 2025 unincorporated total rate of 34.86 mills, estimated annual savings are $20,000 ÷ 1,000 × 34.86 = $697.20 before considering how your exemptions, VOE, city taxes, and final 2026 millage rates apply. Even a smaller $25,000 value reduction would be about $348.60 at that rate.

Do not miss the portal deadline. Gwinnett’s policy is unusually explicit: starting an online appeal is not enough. It must be completed and submitted by the deadline.

If you missed June 29, 2026: you generally cannot file a normal 2026 assessment appeal for the May 15 notice. Your next practical options are to verify exemptions with the Tax Commissioner, correct obvious property-record errors with the Assessors’ Office, and prepare comps early for the next annual notice cycle.