If My Home Value Goes Up, Will My Georgia Property Taxes Automatically Go Up?

Not automatically. In Georgia, your property-tax bill depends on four main pieces: the county’s assessed value, applicable exemptions, millage rates and the taxing jurisdictions that apply to your property.

Most residential property is assessed at 40% of fair market value. If your assessment increases while exemptions and millage rates remain unchanged, your bill will generally increase. However, a government may adopt a lower or “rollback” millage rate that offsets some digest growth. Georgia Department of Revenue property-tax explanation, accessed August 13, 2026.

A higher neighborhood sale price does not immediately determine your individual assessment. Tax assessors review sales data when estimating fair market value, but your home’s characteristics, assessment history, exemptions and local rules also matter.

What changed locally?

McDonough kept its city millage rate unchanged — confirmed

On August 10, the McDonough City Council adopted a 3.033-mill rollback rate, keeping its municipal rate stationary for the fifth consecutive year. The city’s 2026 net tax digest is approximately $1.992 billion, down from $1.998 billion in 2025. City of McDonough announcement, August 10.

What that means:

• This applies to the City of McDonough’s portion of a property-tax bill.

• It does not guarantee that every McDonough homeowner’s total bill will remain unchanged.

• County, school-system and other applicable taxes are separate.

• An individual bill can still change because of a reassessment, exemption change or property improvement.

July sale prices provide market context—not tax assessments

Georgia MLS’s newly available July 2026 data show average sold prices increased year over year by approximately 5.9% in Henry County and 0.9% in Spalding County, while Fayette County’s average declined approximately 7.7%. Georgia MLS county report, accessed August 13.

Those averages describe the mix of Georgia MLS homes that closed during July. They should not be presented as countywide appreciation rates or predictions of individual tax assessments.

Who is affected?

• McDonough: Directly affected by the confirmed 3.033-mill city rate.

• Henry County outside McDonough: Not directly affected by McDonough’s municipal decision.

• Fayette and Spalding counties: The Georgia tax explanation applies, but I found no comparable consequential millage decision from the past seven days to connect to this question.

Homeowners generally have 45 days from the mailing date of an assessment notice to appeal based on value, uniformity, taxability or denial of an exemption. Deadlines are property- and county-specific. Georgia DOR assessment and appeal guidance.

This is general education, not legal or tax advice. Property owners should verify their assessment, exemptions, appeal deadline and complete tax calculation with the appropriate county assessor or tax commissioner.

Here’s the simple version of how property taxes work in McDonough:

1. Market value: The county estimates what your home is worth.

2. Assessed value: Georgia taxes property based on 40% of that value. A $400,000 home has an assessed value of $160,000.

3. Exemptions: Homestead and other qualifying exemptions can reduce the amount you’re taxed on.

4. Millage rate: This is the tax rate applied to your taxable assessed value. On August 10, 2026, McDonough kept its city millage rate at 3.033 mills for the fifth straight year.

For a $400,000 home, the City of McDonough portion would be about $485 per year before applicable exemptions.

Important: That $485 is only the city portion. Your total property tax bill may also include Henry County, Henry County Schools, and other applicable taxes.

Simple formula:
Home Value × 40% − Exemptions × Millage Rate = Property Tax

Wondering how your property’s assessed value compares with recent neighborhood sales? I’d be happy to provide a complimentary market-value update—no pressure and no obligation.