2026 fiscal calendar
Know the tax date before it becomes a penalty date.
Tax bills, payment rules, and valuation-review windows are controlled by the local jurisdiction and the governing state framework. The verified record below separates published figures from dates that require confirmation with Cobb County Board of Tax Assessors.
Effective rate
the reviewed official sources publish local millage information and tax administration rules, but not a single countywide effective property-tax percentage.
Statement mailing
June 5, 2026; Cobb County's official 2026 assessment information states notices were mailed Friday, June 5.
Payment deadline
December 20, 2026 is Georgia's statutory default ad valorem payment deadline; a local governing authority may instead set December 1 or November 15 or use installment billing, so verify the county bill. Georgia law gives taxpayers 60 days from the tax-bill postmark before interest accrues.
Valuation protest
45 days from the date on the 2026 Notice of Assessment; Cobb County's official appeal FAQ states Georgia law provides 45 days and no extension.
Critical payment warning
Do not assume a grace period.
The verified county record identifies the payment timing above but does not establish a universal penalty schedule for this page. Late charges, interest, collection costs, tax-sale procedures, and lien or foreclosure timelines can depend on state law and the local collector’s process. If the deadline is close or a balance is delinquent, contact the tax collector directly and request the current payoff amount in writing.
Treat the published payment deadline as a hard operational date and retain your receipt or confirmation number.
Read the calendar in order
From assessment to collection
1. Valuation and notice
Review the assessment notice as soon as it arrives. The protest window may run from the notice date rather than from the payment due date.
2. Statement and account review
Match the tax statement to the parcel or account number and confirm exemptions, assessed value, taxing units, credits, and balance.
3. Payment confirmation
Use the official collector channel, then save the receipt, transaction reference, and date posted. A bank submission is not always the same as a county posting date.