It is a public sale, often held online, where a county sells tax lien certificates on delinquent properties to investors. Bidders compete by bidding the interest rate down or by paying a premium above the lien amount.
The certificate you win is explained in our guide to tax lien certificates, including its sale and bidding sections. This entry focuses on how the bidding itself works and how to prepare.
Bid-Down vs Premium: How Your Rate Gets Set
In a bid-down auction, the state sets a maximum rate and bidders compete by accepting less. Florida county tax collectors start at a maximum of 18% per year, and bids drop in quarter-point (0.25%) steps. The bidder willing to take the lowest rate wins. Certificates nobody bids on are struck to the county at the maximum rate.
Arizona works on the same principle with a lower cap: the lien goes to the bidder who accepts the lowest interest rate, up to 16% per year. In both states, heavy competition on attractive parcels can push the winning rate far below the ceiling.
In a premium auction, the rate is not what you bid on. Colorado bidders pay an amount above the lien, and that premium goes to the county general fund. It does not come back when the owner redeems, so every dollar of premium lowers your effective return.
Some places blend the two. In New Jersey, bids start at 18% and go down, and once bidding falls below 1%, bidders may offer a cash premium. A reform bill, S2052, was introduced in 2026, so confirm current terms with the municipality.
Registration and Deposits
Most of the work happens before the sale opens. Many counties require bidders to register in advance and post a deposit, and the deadlines for both can fall well ahead of auction day. Miss them and you cannot bid, however much research you have done.
Plan your cash around the deposit and the payment terms the county publishes. Funds tied up in a deposit are not earning anything, and a payment deadline you cannot meet can cost you the certificate. Confirm every amount and deadline with the county.
Preparation also means building your bid list early. Decide your floor rate or maximum premium for each parcel before bidding starts, because live bidding moves fast and leaves little room to reconsider.
Where a Tax Lien Auction Happens Online
GovEase, RealAuction and Bid4Assets are among the online platforms counties now use for lien sales. Each platform has its own account setup, and each county sets its own rules on top of it, so two counties on the same platform can still differ on deposits and timing.
Online sales open the door to counties far from home, which multiplies the dates and deadlines you need to watch. MarketplacePro’s opportunity tracking combines an auction calendar with downloadable bid lists, so you arrive at each sale with parcels researched and limits set. You still register and bid on the county’s chosen platform.
Before sale day, log in to each platform, read the county’s bidder terms posted there, and note the time zone the sale runs in. A login problem or a missed start time costs you parcels just as surely as a missed deposit.
Example: The Same $1,000 Lien Under Two Formats
Hypothetical, bid-down format: A county with an 18% ceiling offers a $1,000 lien. Bidding falls in quarter-point steps until it stops at 8%. The winner pays $1,000. If the owner redeems after one year, the winner collects $1,080.
Hypothetical, premium format: A county pays an assumed fixed 10% per year on the lien amount. The winner bids a $200 premium and pays $1,200 in total. After one year the owner redeems, and the winner collects the $1,000 lien plus $100 in interest. The premium does not come back, so the winner gets $1,100 on a $1,200 outlay and loses $100.
The lesson: a premium can wipe out the interest entirely, and a low winning rate in a bid-down sale still beats an oversized premium.
FAQ
Quick answers for first-time bidders.
What happens to liens nobody bids on?
It depends on the state. In Florida, unsold certificates are struck to the county at the maximum rate. Elsewhere, confirm with the county.
Does the lowest bid always win?
In a bid-down auction, the lowest accepted rate wins. In a premium auction, the highest premium wins.
Can I bid in other states’ auctions online?
Often, yes, since many counties sell online. Registration and eligibility rules vary, so confirm with each county.
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