How is the County allowed to sell a certificate on my property?
Florida Statute 197.432 requires that the Tax Collector sell tax certificates on properties with unpaid taxes on or before June 1. A tax certificate (lien) sale is a public auction for investors to earn interest for paying other people's property taxes. A certificate is auctioned off to the bidder who is willing to accept the lowest interest rate. If there are no bids on a tax certificate, it would be "struck off" to the County at 18%; the highest interest rate allowed by Florida Statutes.
Someone bought a certificate on my property, does that mean they now own it?
No. The certificate holder has no claim on the property. However, two years after taxes become delinquent, the certificate holder can place a Tax Deed Application on your property. (Example - 2015 unpaid taxes which had a certificate sold by June 1 of 2016, can have a Tax Deed Application made on it beginning on April 1, 2018). After a tax deed application is made, the property will be scheduled for auction and if the taxes are not paid, will be sold to the highest bidder. If that happens, you have lost any claim or ownership on it.