Clayton County homeowners faced a 31% tax hike but most don't know they can appeal. Here's the full process, deadlines, and evidence strategy.
How to Appeal Your Property Tax Assessment in Clayton County, Georgia Clayton County homeowners recently faced a 31.11% property tax increase over the rollback millage rate — one of the sharpest jumps in metro Atlanta. With a median home price around $244,000 and a 2025 millage rate of 14.552 mills, even a modest overassessment can cost hundreds of dollars per year. Yet over 80% of Georgia homeowners have never filed a Clayton County property tax appeal, and more than half don't realize they have the right to do so. If your assessment notice arrived with a number that doesn't reflect what your home is actually worth, you have 45 days to challenge it. This guide walks through every step of the Clayton County appeal process — from understanding how your assessed value is calculated to presenting evidence at a Board of Equalization hearing — so you can pursue a fair assessment with confidence. How Does Clayton County Calculate Your Property Tax? Georgia law requires that all property be assessed at 40% of its fair market value. The Clayton County Board of Tax Assessors determines your home's fair market value as of January 1 each year, then multiplies that by 0.40 to arrive at your assessed value. Your tax bill is calculated by multiplying the assessed value by the applicable millage rate. Here's how that works for a Clayton County home valued at $244,000: Step Calculation Result ------ ------------- -------- Fair market value Set by Board of Assessors $244,000 Assessed value (40%) $244,000 x 0.40 $97,600 Millage rate (2025) 14.552 mills 14.552 Annual property tax $97,600 x 0.014552 $1,420 The millage rate is the combined rate from all taxing authorities — county government, school district, and any special districts. Clayton County's 2025 net millage rate of 14.552 mills dropped slightly from…