Gwinnett County, GA — Property Tax Underwriting Guide
Georgia · Annual review at fixed assessment ratio
What this means for multifamily underwriting
Gwinnett County is one of the fastest-growing Atlanta-metro counties with strong multifamily absorption. Tax = (FMV x 0.40) x millage.
Transaction type breakdown
Property is assessed annually at 40% of fair market value. A recent arm's-length sale is the strongest evidence of FMV.
Refinance does not affect the FMV determination.
Ownership change does not cap value; annual FMV review continues.
Tax appeal information
27.5 mill applied to 40% of FMV yields ~1.1% effective rate on market value.
Guide review
County guidance last reviewed: June 15, 2026
Tax-rate scope: County-level underwriting placeholder; not a parcel-specific tax rate.
Official sources: Gwinnett Board of Assessors
40% ratio and annual review model are firm; millage is a blended county-level placeholder.
Parclio estimates are underwriting guidance, not legal or tax advice. Always verify millage rates, the seller's assessed value, and appeal deadlines with the county assessor or local counsel before relying on these numbers for a credit decision.
Run a tax reset estimate for Gwinnett County
Use Parclio's estimator to model the post-closing tax bill, NOI impact, DSCR change, and underwriting memo language for your next Gwinnett County deal.