Why the seller's property tax bill is not your property tax bill

How Florida assesses property

Each January, county property appraisers determine every property's just value — essentially market value — and then apply any assessment limitations and exemptions to reach taxable value. Local taxing authorities set millage rates through the public Truth in Millage process, and the tax bill is taxable value times those rates, plus any non-ad valorem assessments such as community development district charges. The Florida Department of Revenue's taxpayer pages lay out the full cycle.

The structure matters for buyers because two of its pieces — the assessment limitation and the homestead exemption — attach to the owner, not the house. They do not ride along with the deed.

What Save Our Homes does for the current owner

Under the Save Our Homes limitation in section 193.155, Florida Statutes, once a home has a homestead exemption, its assessed value cannot rise each year by more than three percent or the change in the Consumer Price Index, whichever is lower — regardless of what the market does. Over a long tenure in an appreciating market, the gap between market value and capped assessed value grows large. That accumulated gap is the owner's Save Our Homes benefit.

This is why a longtime owner of a valuable home can be paying taxes on an assessed value far under what the home would sell for. The system is working as designed — for them.

What the sale does

When the property changes ownership, the limitation resets. The property appraiser reassesses the home at just value as of January first following the sale, the seller's accumulated benefit disappears, and your taxes are computed from a market-value assessment going forward. You then start your own clock: file for your homestead exemption, and the Save Our Homes cap begins limiting increases from your new, higher base.

If you are moving from a previous Florida homestead, portability may soften the reset: the Department of Revenue explains that you can transfer some or all of your prior Save Our Homes benefit to the new homestead by filing the transfer form with your homestead application within the statutory window. Portability helps repeat Florida homesteaders; it does nothing for first-time buyers or arrivals from out of state.

Where budgets go wrong

The failure mode is mechanical. A listing shows the seller's most recent tax bill — a bill computed on a capped assessment and the seller's exemptions. A buyer, or a hurried estimate, projects that bill forward. The first post-reset bill arrives computed on the purchase-price-level assessment, and it can be a multiple of the number in the listing.

With a mortgage, the surprise compounds: your escrow account was funded at the old figure, so the higher bill produces an escrow shortage, and your monthly payment rises to cover both the correct taxes and the shortfall repayment. Nothing about the loan changed — the tax estimate was simply wrong from the start.

How to budget it correctly

The correction is straightforward and worth doing before you write an offer:

• Estimate taxes from your purchase price and the local millage, not from the seller's bill. Most county property appraiser sites offer a buyer tax estimator for exactly this reason.
• Subtract only the exemptions you will hold — and remember your homestead exemption and any portability apply beginning with the first assessment year you qualify.
• Check the bill for non-ad valorem assessments, which do not reset but also do not go away.
• Ask us to run qualification and escrow numbers on the reassessed estimate, so the loan is sized against the taxes you will actually pay.