On a $400,000 purchase in DeKalb County, GA, property tax comes to about $3,232 a year — roughly $269 a month — at this county's effective rate of 0.81%.
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Effective rate 0.81% = this county's median owner-occupied tax bill ($2,856, ACS 2022 5-year estimate) divided by the typical home value at the time ($353,455, Zillow, 2022-12-31). Exemptions the seller holds — homestead, senior, veteran — usually do not transfer with the deed, so a new purchase can run above this figure. The county assessor sets the assessed value; this is an estimate, not a quote.
If you pay late
There is a 5% penalty for late payment of the first or second installment if the envelope is not postmarked by September 30 or November 15.
Calendar tax year; bills are mailed in August with the first installment due September 30 and the second November 15. If a due date lands on a weekend or public holiday, most counties move it to the next business day — check the county's own notice before relying on the shift.
How to pay
Online: through dekalbtaxga.gov — the only portal this county operates.
By post: mail a cheque to the treasurer's office; the postmark date usually counts, not the arrival date.
In person: the treasurer's office during business hours; bring your bill or parcel number.
Mortgage escrow: if your taxes are escrowed, the servicer pays — you still owe the difference if your escrow is short.
Common questions
When are property taxes due in DeKalb County, GA?
2nd installment (2026 tax year): November 16, 2026. 1st installment (2027 tax year): September 30, 2027.
What happens if I pay late in DeKalb County?
There is a 5% penalty for late payment of the first or second installment if the envelope is not postmarked by September 30 or November 15.
How do I pay DeKalb County property tax?
Pay online through dekalbtaxga.gov, the county's own payment portal, or by post or in person at the treasurer's office.
Is the DeKalb County deadline the same every year?
Calendar tax year; bills are mailed in August with the first installment due September 30 and the second November 15. Counties shift dates when billing is delayed, so confirm against the county source linked on this page.
How much is property tax on a $400,000 house in DeKalb County, GA?
About $3,232 a year, or $269 a month, at this county's effective rate of 0.81%. That rate is the county's median owner-occupied tax bill ($2,856) divided by the typical home value ($353,455). A seller's homestead or senior exemption usually does not transfer, so a new purchase can cost more.
What if I can't pay in full?
Most counties offer instalment plans or partial payment — ask the treasurer before the due date, not after. Once the bill is delinquent the options shrink and the fees start.
Does a late payment affect my mortgage?
Unpaid property tax is a lien on the property in most states, which your servicer may pay and then bill you for, with fees. It does not disappear.
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CountyTaxDates is an independent reference and is not a government agency. Deadlines change and exceptions apply — always confirm with your county treasurer using the official link on this page. Nothing here is tax, legal or financial advice.