Florida homebuyers who have been hit with surprise property tax bills after closing are about to get a little more warning. A new state law signed last Monday will change how online listings present taxes, forcing platforms to either show a standardized estimate of annual ad valorem taxes or send users to the county tax estimator instead of relying on the seller’s historical tax bill.
The law, officially titled the Disclosure of Estimated Ad Valorem Taxes, adds a new subsection to Florida Statute 689.261 and lays out how listing platforms must calculate those estimates. Sites must either use a Department of Revenue formula tied to the listing price or a countywide aggregate millage rate. The statute also prohibits using the current owner’s tax bill as the buyer’s estimate and directs the Department of Revenue to publish the formula and a table of county property appraiser links beginning December 15 so platforms have a standard source to pull from, according to the Florida Senate.
What platforms must do
If a site opts not to display an estimated tax figure, the law bars it from showing the seller’s prior tax bill and instead requires a link to the local property appraiser’s tax estimator or homepage. The change is aimed squarely at a common confusion point: longtime homesteaders often pay significantly less than a new buyer will, thanks to caps and exemptions, and that gap has been tripping up unsuspecting buyers. State and industry representatives say platforms and county appraisers will spend the rest of 2026 working out the technical side of the transition, as reported by Tampa Free Press.
Why appraisers pushed it
County property appraisers have been flagging cases for years in which buyers leaned on the tax number in a listing, only to see escrow payments or tax bills spike after the deed changed hands and homestead benefits dropped away. Pinellas County Property Appraiser Mike Twitty, who chairs the Property Appraisers’ Association of Florida’s legislative committee, has been one of the most vocal supporters. He told reporters that “prospective homebuyers deserve property tax information that reflects what they are actually likely to pay,” as Tampa Free Press noted. Twitty’s office has publicly detailed the push for the law and the real-world examples behind it, per the Pinellas County Property Appraiser.
Timeline and next steps
The Department of Revenue must publish the county-level formula and aggregate millage rates beginning December 15, 2026, giving listing platforms a standardized way to calculate estimates and line up their calculators with official data, according to a statewide summary of the appropriations package. The law’s compliance date is February 1, 2027, and county property appraisers are expected to supply millage and tax district information to the Department of Revenue so platforms can refresh their tools before the new rules kick in, per the Florida Association of Counties.
Legal implications
The enacted language includes immunity for people and companies that publish the estimates, limiting civil exposure if an estimate later proves inaccurate, as long as required disclaimers are in place. Those disclaimers must clarify that exemptions and non ad valorem assessments are not fully captured in the estimate. The statute also gives the Department of Revenue rulemaking authority and makes agency rule development, along with county cooperation, central to how the new disclosure system will function in practice. The detailed statutory language is set out in the bill text available from the Florida Senate.
