The envelope in your mailbox from the county tax assessor is easy to mistake for a bill. It is not one. It is a countdown. Under a new state law, the Annual Notice of Assessment that Georgia counties are mailing this year starts a hard 45-day clock to challenge the value the county has placed on your home - and this year the notice itself looks completely different than it did before.
For homeowners with a mortgage, this is not just a tax-office story. A higher assessed value flows through to a higher property-tax bill, which your loan servicer pays out of escrow, which raises your monthly payment. If you are going to do something about it, the window is short and it is already closing across much of metro Atlanta.
What Senate Bill 566 changed
Georgia Senate Bill 566, signed into law and effective retroactively to January 1, 2026, requires every county to use a single, uniform statewide format for the annual notice of assessment. The 2026 notices are the first to use it. The law amends the state's ad valorem (property) tax code - specifically the annual-notice statute (O.C.G.A. § 48-5-306) - that governs what the notice must contain.
If you compared this year's notice to last year's, you would notice what is gone. The redesign removes the old property-tax-estimate table and the estimated millage and rollback rates (the School Bond, County Bond, and Fire Operations lines many owners used to see). In their place the new notice puts the focus on the property's fair market value, adds an "estimated tax savings" figure, and includes plain-language instructions for how to appeal and how to claim a homestead exemption. Local coverage from WRDW/News 12 in Augusta and the Marietta Daily Journal describes the same shift in how the notice reads.
SB 566 also does one quiet but useful thing for owners: it extends the homestead-exemption filing period so that it runs through the same 45-day window that follows the notice's mailing. If you have moved into a home as your primary residence and never filed for the exemption, that deadline now lines up with your appeal deadline.
How the 45-day clock actually runs
This is the part that catches people. The 45 days are counted from the date the notice was mailed - the date printed on the notice - not the day it landed in your mailbox and not the day you opened it. Weekends and holidays do not extend the deadline. If day 45 falls on a Sunday, it is still the deadline.
Miss it, and you forfeit your right to appeal the assessed value for the entire tax year. There is no informal grace period and no do-over until next year's notice. As the appeal-deadline guidance at AppealDesk lays out, the clock is unforgiving precisely because it runs from mailing, not receipt - so a notice that sat in your mailbox for a week during a trip has already burned a week of your window.
One more thing worth repeating because the confusion is so common: the Notice of Assessment is not a tax bill. It tells you what the county thinks your home is worth. The actual bill comes later. In Cobb County, for example, the tax assessor's office notes the real tax bill mails around August 15 and is due around October 15 - separate document, separate deadline.
Metro Atlanta deadline tracker
Because counties mail on their own schedules, the deadlines are staggered. Metro Atlanta counties generally mail from spring into early summer - roughly April through June - which means many 2026 deadlines are hitting right now. Do not assume your neighbor's deadline is yours, and certainly do not assume the county next door matches.
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Cobb County mailed 2026 notices on Friday, June 5, which puts the filing deadline at roughly July 20, 2026.
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Augusta / Richmond County mailed notices on June 29, 2026, putting the appeal deadline at August 13, 2026.
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Fulton, DeKalb, and Gwinnett typically mail spring to early summer, with deadlines landing in this same stretch. Read the mailing date off your own notice to know your exact day 45.
The single most important number on the page is the mailing date. Find it, count 45 days forward on a calendar, and treat that as a hard stop.
Why this is a mortgage story, not just a tax story
If you own your home free and clear, a higher assessment is a tax question. If you have a mortgage, it is a monthly-payment question. Most homeowners with a loan pay property taxes through an escrow account: a portion of every monthly mortgage payment goes into that account, and the servicer uses it to pay your property taxes and homeowners insurance when they come due.
The Consumer Financial Protection Bureau explains the mechanism plainly in its guide to escrow accounts: the servicer pays your property taxes out of escrow, and when those taxes rise, "your escrow payment - and with it, your total monthly payment - will change accordingly." In other words, a higher assessed value can quietly push up the monthly payment you have budgeted around.
There is a second-order effect too. If your taxes jump partway through the year, the escrow account can come up short of what it needs to cover the bill. Servicers make up that gap through an escrow shortage adjustment - either a lump-sum catch-up or, more commonly, a spread of the shortfall across your next 12 payments on top of the already-higher amount. That is how a single line on an assessment notice can turn into a payment increase you feel for a year. Appealing a value you believe is too high is, for a financed homeowner, a direct way to protect the monthly payment.
How to actually win the appeal
An appeal is not a complaint. The county is not moved by the argument that your taxes feel too high. What works, per the appeal guidance at AppealDesk, is evidence:
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Recent comparable sales - actual closed sales of similar nearby homes, not current listings and not asking prices.
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A specific requested value. Tell the county what you believe the home is worth and back it with the comps, rather than just saying the number is wrong.
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A clean, professional presentation. Organized evidence that a reviewer can follow gets taken seriously.
What loses: "my taxes are too high," Zillow or other automated estimates, emotional appeals, and out-of-state or far-flung comparables that do not reflect your local market. If your notice also flags that you are not receiving a homestead exemption you qualify for, remember SB 566 now lets you file for it inside the same 45-day window - handle both at once.
Your action checklist
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Pull the notice out and find the mailing date. That date starts the clock.
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Count 45 calendar days forward - including weekends and holidays - and write that deadline down.
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If the value looks high, gather recent comparable sales near you and decide on a specific value you will request.
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File before the deadline, online or by mail, per the instructions printed on your notice.
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If you qualify for a homestead exemption and are not getting it, file for that in the same window.
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Remember the tax bill is a separate document that arrives later in the fall - do not wait for it to act on the assessment.
Don't confuse this with the homestead-freeze law
You may have seen separate coverage of Georgia's homestead-value-freeze measure (SB 33). That is a different subject. SB 566 is about the format of the notice and the appeal window - the document design, the 45-day clock, and the appeal and exemption instructions. It does not cap or freeze your home's assessed value. Keep the two stories separate so you know which deadline and which right actually applies to the notice in front of you.
Related reading
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The $832,750 Line: Why Fewer Atlanta Buyers Will Need a Jumbo Loan in 2026
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[Nurses, Teachers and First Responders Can Now Get $12,500 Down in Georgia — Inside the 2026 Georgia Dream 'PEN Choice' Boost](/article/georgia-dream-pen-choice-12500-down-payment-2026)
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Don't Bank on a July Rate Cut: A Cut Is Off the Table, and a Hike Is the Only Live Surprise
Sources
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Tax assessment notices mailed to Augusta property owners (WRDW/News 12)
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O.C.G.A. § 48-5-306 - Annual notice of current assessment (Justia)
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[Georgia Property Tax Appeal Deadline 2026: 45 Days from Notice (AppealDesk)](https://www.appealdesk.com/blog/property-tax-appeal-deadline-georgia)
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New state law results in changes to property tax assessments (Marietta Daily Journal)
