Tax lien certificates are sold by county governments, not through brokers or online marketplaces
A tax lien certificate is a document issued by a county when a property owner fails to pay property taxes. The county sells these certificates to raise money when ready rather than waiting years for the taxes to be collected. When you buy one, you are lending money to the county in exchange for a certificate that pays you interest — typically 8% to 36% per year depending on the state and the specific auction — once the property owner pays their back taxes.
The county treasurer's office or tax assessor's office in each county runs these sales. There is no national marketplace. You cannot buy them through a bank, a brokerage, or an online platform the way you would buy stocks or bonds. Instead, you attend an auction held by the specific county where the property is located, or you bid remotely if that county offers online bidding.
The process varies significantly by state and even by county within a state. Some counties hold auctions monthly, others once or twice a year. Some allow remote bidding, others require you to be present in person. Some sell certificates for the full tax debt, others sell the property itself if the debt goes unpaid. Understanding which county you want to buy from, and what that county's rules are, is the first step.
Key Takeaways
- Tax lien certificates are sold only by county governments at auctions they run themselves — there is no national marketplace or online broker.
- Each county sets its own auction schedule, bidding rules, and interest rates, so you must research the specific county where the property is located.
- You can find upcoming auctions through the county treasurer's website, the tax assessor's office, or third-party listing sites that aggregate county auction schedules.
- Most counties require you to register before bidding, provide proof of funds, and bid in person or online depending on the county's system.
- The interest rate you receive depends on the state law and the auction method — some counties use a fixed rate, others let bidders compete on the rate itself.
Finding which county auctions are happening and when
Start by identifying the county where the property is located. Property tax records are public, and you can search them through the county assessor's website using the property address. Once you know the county, go to that county's treasurer or tax assessor website and look for a section labeled "Tax Sale," "Tax Lien Sale," "Delinquent Tax Sale," or "Auction Schedule." The exact name varies by county.
The county website will list upcoming auction dates, the properties included in that auction, and the rules for that specific sale. Some counties post this information months in advance; others post it only weeks before. Many counties also publish a list of properties that will be auctioned, including the amount of back taxes owed on each one. This list is your chance to research properties before you bid.
If you cannot find the information on the county website, call the county treasurer's office directly. They can tell you when the next auction is, how to register, and whether the county offers remote bidding. A few third-party websites, such as Bid4Assets and Real Auction, aggregate tax lien auctions from multiple counties and let you search by state or county. These sites do not run the auctions themselves — they straightforward list what is coming up — but they can save you time if you are looking across multiple counties.
Understanding the different auction formats and how bidding works
Counties use different methods to decide who wins a certificate and what interest rate they receive. The most common method is the interest rate bid: the county sets a starting interest rate, and bidders compete by offering lower rates. The bidder willing to accept the lowest interest rate wins the certificate. This means if you bid 8% and another bidder bids 7%, the other bidder wins, and you go home empty-handed.
A second method is the premium bid: bidders compete by offering to pay more than the tax debt itself. If the back taxes are $5,000, you might bid $5,500, and the county receives the extra $500 as a premium. The bidder willing to pay the highest premium wins. In this case, you still receive the standard interest rate set by state law, but you paid more upfront to win the certificate.
A third method, used in some states, is the property sale: if the taxes remain unpaid after a set period (often several years), the county forecloses and sells the property itself at auction rather than just the certificate. This is a different transaction entirely and carries different risks. Some counties use a hybrid: they sell the certificate first, and if it is not redeemed within a set time, the property goes to auction.
Before you bid in any auction, read the county's auction rules document. It will specify which method that county uses, what the interest rate is (or the range of rates you can bid), what happens if the property owner redeems the certificate, and what happens if they do not. These rules are not negotiable and vary widely.
How to register and prepare to bid
Most counties require you to register before the auction begins. Registration typically involves providing your name, address, phone number, and proof that you have funds available to pay for the certificates you win. "Proof of funds" usually means a bank statement showing you have enough cash on hand, or a letter from your bank confirming your account balance. Some counties ask for a cashier's check or a deposit held in escrow.
If the county offers in-person auctions, you will attend on the scheduled date at the county courthouse or tax assessor's office. Bring your registration confirmation and a valid ID. Bidding happens in real time, and you signal your bids by raising your hand or using a paddle. Once you win a certificate, you typically pay when ready — usually by cashier's check or wire transfer on the same day.
If the county offers online bidding, you will register on their website or a third-party platform they use, set up login credentials, and place bids remotely. Online auctions may run for a set period (for example, 24 hours or one week) rather than all at once. You will receive confirmation of your winning bids by email, and payment instructions will follow. Payment important date vary but are usually within a few days of the auction closing.
Before you register, confirm what payment methods the county accepts. Most accept cashier's checks, wire transfers, and credit cards, but some accept only checks. Confirm the important date for payment as well — missing it can result in forfeiture of your winning bid and loss of your registration deposit.
What happens after you buy a certificate
Once you own a tax lien certificate, the county sends you a document confirming your ownership. You now have a lien on the property — a legal claim that the property owner must satisfy before they can sell the property or refinance it. The property owner has a set period, called the redemption period, to pay you back the amount you paid plus the interest rate specified in your certificate. This period ranges from six months to three years depending on the state.
During the redemption period, you receive no payments. You are straightforward waiting. If the property owner pays their back taxes during this time, they redeem the certificate, and you receive your principal plus accrued interest. The interest accrues daily or monthly depending on state law, and you receive a lump sum when the certificate is redeemed.
If the property owner does not redeem the certificate by the end of the redemption period, you may have the right to foreclose on the property and take ownership of it. However, foreclosure is a legal process that requires filing paperwork with the court, paying court fees, and potentially dealing with other liens on the property. Many certificate holders never foreclose; they straightforward let the certificate expire and move on to the next one. The rules about what happens to your money if you do not foreclose vary by state, so confirm this before you bid.
State-by-state differences in interest rates and redemption periods
Interest rates on tax lien certificates are set by state law, not by individual counties. Some states set a fixed rate — for example, Florida pays 5% interest, and Texas pays 25%. Other states allow the rate to vary by county or let bidders compete on the rate itself. A few states use a penalty system instead of interest: you receive your principal back plus a flat penalty if the certificate is redeemed, rather than daily or monthly interest.
Redemption periods also vary by state. Some states give property owners only six months to redeem; others give them three years. A longer redemption period means you wait longer to be paid, but it also means the property owner has more time to catch up on taxes, so redemption is more likely. A shorter period means faster payment but higher risk that the certificate will not be redeemed and you will have to decide whether to foreclose.
Before you buy certificates in any state, research that state's tax lien laws. Your state's Department of Revenue or Department of Taxation website usually has a summary. If you are buying in multiple states, the rules will be different in each one, and mixing them up is an expensive mistake.
Red flags and common pitfalls when buying certificates
Do not buy a certificate on a property you have not researched. Before you bid, find out whether the property has other liens on it (such as a mortgage or a judgment lien), whether it is in a flood zone or an area with environmental contamination, and whether the property is worth more than the tax debt. If a property has a mortgage, the mortgage holder has priority over your lien, meaning they get paid first if the property is sold. If the property is worth less than the total debt, you may never be paid even if you foreclose.
Do not assume the interest rate is may provide. In states where bidders compete on the rate, you might win a certificate at 8% interest, but if the property owner does not redeem it and you do not foreclose, you receive nothing. The interest is only paid if the certificate is redeemed. If you foreclose and take ownership of the property, you own real estate, not a certificate — a very different situation with different costs and risks.
Do not miss registration important date or payment important date. Counties enforce these strictly. If you win a bid and do not pay by the important date, you forfeit the certificate and your registration deposit. If you miss a registration important date, you cannot bid in that auction at all.
Frequently Asked Questions
Can I buy tax lien certificates online?
Some counties offer online bidding through their own websites or third-party platforms. However, not all counties do. You must check the specific county's website to see whether they offer remote bidding. Even if they do, you still must register with that county and meet their proof-of-funds requirement before you can bid.
What is the difference between a tax lien certificate and owning the property?
A tax lien certificate gives you a lien on the property and the right to receive interest if the owner redeems it. You do not own the property. If the owner does not redeem the certificate and you choose to foreclose, then you can take ownership — but foreclosure is a separate legal process that takes time and money. Most certificate holders never foreclose.
How much money do I need to buy a certificate?
You must have enough cash on hand to cover the amount you bid. If you bid $10,000 on a certificate, you must be able to pay $10,000 when ready after winning. The county will ask for proof of funds before the auction. The amount varies depending on which properties are being auctioned in that county.
What happens if the property owner never redeems the certificate?
After the redemption period ends, you have the option to foreclose on the property and take ownership. However, foreclosure requires filing court paperwork, paying court fees, and potentially dealing with other liens. Many certificate holders do not foreclose. What happens to your money if you do not foreclose depends on state law — some states allow you to renew the certificate, others do not.
Can I sell a tax lien certificate to someone else?
In most states, yes, but the process and restrictions vary. Some counties allow you to assign your certificate to another person, while others do not. If assignment is allowed, you typically must notify the county in writing. Check your county's rules before you assume you can sell a certificate you own.