Doorlark
Short answer: in many states the tax bill on the listing is the seller's bill, not the buyer's. A sale can reset the assessed value to about the price paid, and the seller's exemptions and caps usually don't transfer. So the buyer's first full bill can be much higher. Budget on the purchase price, not on last year's bill.
Why the bill changes after a sale
- Reassessment on sale. Some states cap how fast a home's assessed value can rise while the same owner keeps it. When it sells, the cap ends and the value resets.
- Exemptions don't carry over. Homestead, senior, veteran and disability exemptions belong to the owner. The buyer has to apply for their own, and may not qualify for the same ones.
- Timing. The reset often shows up a year later, or as a separate supplemental bill. Buyers who budgeted off the escrow figure at closing get a payment increase after the first escrow analysis.
Two states where this hits hardest
Florida. A homestead's assessed value can rise only 3% a year or the CPI change, whichever is lower (2.7% for 2026). That's the Save Our Homes cap. After a sale, the home is assessed at just (market) value on the next January 1. A seller who's owned for 15 years may be taxed on far less than market value. The buyer won't be.
California. Under Proposition 13, assessed value generally rises no more than 2% a year until the home changes ownership. A sale resets it to market value as of the transfer date, which is usually the price. The county then sends a supplemental tax bill for the rest of the fiscal year, separate from the regular bill and usually not paid through escrow.
Worked example (illustrative numbers)
| Seller's assessed value after years under a cap | $180,000 |
| Buyer's price, and roughly the new assessed value | $400,000 |
| Seller's tax at a combined 1.8% of assessed value | $3,240 a year |
| Buyer's tax at the same rate | $7,200 a year |
| Difference in the monthly payment | $330 a month |
Example numbers to show the effect, before any exemption the buyer qualifies for. Real rates and exemptions vary by county.
How to estimate the buyer's bill
- Look up the county's tax rate (millage) for that address on the tax collector or assessor site.
- Multiply it by the purchase price, or by the assessed value the assessor would likely set.
- Subtract any exemption the buyer will qualify for and apply for.
- Give that number to the lender so the payment estimate uses it, not the seller's bill.
What to tell your buyer
"The tax on the listing is what the seller pays today. After you buy, the county will likely reassess it closer to your price, and the seller's exemption doesn't come with the house. I'd budget about [estimate] a year, and we'll file your homestead application as soon as you move in."
Need the closing figure? The property tax proration calculator splits this year's bill between buyer and seller. That proration uses the seller's current bill, which is one more reason the first year can surprise the buyer.
General information, not tax advice. Rules differ by state and county. Check with the county assessor.
Sources
- Florida Statutes §193.155, Save Our Homes and reassessment after change of ownership
- Florida Department of Revenue, Save Our Homes annual cap by year
- Florida Department of Revenue, Save Our Homes and portability (PT-112)
- California BOE, Change in ownership FAQ
- California BOE, Supplemental assessments
Checked Oct 30, 2026.
FAQ
Will my property taxes go up when I buy a house?
Often, yes. In states with assessment caps, like Florida and California, a sale resets the assessed value toward the price, and the seller's exemptions don't transfer. Estimate taxes from the purchase price and the local rate.
Why is the buyer's tax bill higher than the seller's?
The seller may have years of capped increases and exemptions they qualified for. Those belong to the seller, not the house.
What is a supplemental tax bill in California?
A separate bill for the difference between the old and new assessed value for the rest of the fiscal year after a change in ownership. It's usually not paid through the lender's escrow.
Does the Florida homestead exemption transfer to the buyer?
No. The buyer applies for their own homestead exemption, and the home is reassessed at just value on January 1 after the sale.
How should agents estimate taxes for a buyer?
Multiply the local tax rate by the purchase price, subtract exemptions the buyer will qualify for, and give that number to the lender.