Tax lien sales happen at the county level, not online, and you bid against other buyers for the right to collect unpaid taxes

A tax lien sale is an auction where your county sells the right to collect unpaid property taxes. You do not buy the property itself at this stage — you buy a lien, which is a legal claim against the property. The county holds the sale to recover tax money owed by the property owner. If you win the bid, you pay the amount you offered, and the county gives you a certificate or deed (depending on your state) that lets you collect the taxes plus interest from the property owner, or eventually foreclose and take ownership if they never pay.

The process and timeline vary significantly by state. Some states sell tax liens as certificates that sit for years while the owner has time to pay you back. Other states move directly to a tax deed sale, where you can own the property within months. Before you attend any auction, you need to know which type your state uses, when sales happen, and what happens if you win.

Key Takeaways

  • Tax lien sales are run by your county treasurer or tax assessor's office, and most require you to show up in person or bid through an authorized online platform.
  • You must research the property before bidding — check for existing liens, code violations, and whether the property is worth more than the tax debt you are bidding on.
  • Winning a bid means you pay the county when ready, usually by cashier's check or wire transfer, and you receive a certificate or deed depending on your state's law.
  • In certificate states, the original owner has years to pay you back with interest; in deed states, you may own the property within months if they do not pay.
  • Many properties at tax lien auctions have environmental problems, structural damage, or title issues that make them worthless or impossible to sell later.

How your county runs the auction and when it happens

Your county treasurer or tax assessor's office publishes a list of properties with unpaid taxes, usually 30 to 90 days before the sale. The list includes the property address, the amount of back taxes owed, and sometimes a legal description. You can request this list in person, by mail, or read it from the county website. Some counties now post lists online; others still require you to visit the office or call.

The auction itself happens on a set date each year, often in spring or fall. Most counties still hold auctions in person at the courthouse or county office, though a growing number use online bidding platforms. You will need to register before the sale — this usually means showing proof of identity and, in some cases, a deposit check to show you can pay if you win. The deposit amount varies by county but is often a percentage of the opening bid or a flat fee like $500 or $1,000.

On auction day, properties are called one at a time. The opening bid is usually the amount of back taxes, penalties, and costs owed. You bid against other buyers, and the highest bidder wins. Payment is due when ready or within a few days — most counties require a cashier's check, money order, or wire transfer. Personal checks are rarely accepted.

What you need to research before you bid

Bidding on a property you have not researched is how people lose money at tax lien auctions. You cannot inspect the inside of most properties before the sale, and you have no right to enter the building. But you can and must check several things from public records.

First, visit the property in person and look at it from the street. Note whether it appears abandoned, occupied, or in obvious disrepair. Check the county assessor's website for the property's tax history — how many years of taxes are unpaid, whether there are code violations or liens filed against it, and what the property was last assessed at. Search the county recorder's office for any mortgages, second liens, or judgments against the property. These all take priority over your tax lien, meaning you will have to pay them off before you can foreclose and take ownership.

Run a title search through a title company or online title service. This costs $50 to $200 but can reveal problems that public records do not show clearly — such as boundary disputes, easements, or claims from previous owners. Check whether the property is in a flood zone or has environmental issues by searching the EPA database and your county's environmental records. A property in a flood zone or with contamination may be impossible to sell or develop, even if you eventually own it.

Finally, compare the opening bid to what similar properties in the area sell for. If the opening bid is $50,000 and comparable homes sell for $80,000, you might make money. If the opening bid is $80,000 and comparable homes sell for $60,000, you will lose money even if you win and eventually take ownership.

The difference between tax lien certificates and tax deeds

Your state uses one of two systems, and this determines what you own after you win the bid and what happens next.

In a tax lien certificate state (including Florida, Illinois, Indiana, Iowa, and others), you receive a certificate, not a deed. The original owner has a "redemption period" — usually two to seven years, depending on the state — to pay you back the amount you bid plus interest. The interest rate is set by state law and ranges from 5% to 36% per year depending on the state. During this time, you own nothing but the right to collect. If the owner pays you back, you keep the interest and the certificate is done. If they do not pay by the end of the redemption period, you can foreclose and take ownership of the property.

In a tax deed state (including Arizona, Georgia, Texas, and others), you receive a deed to the property itself, not a certificate. The original owner has a much shorter redemption period — often 30 to 180 days — or no redemption period at all. Once that period ends and the owner has not paid, you own the property outright. You can then sell it, rent it, or develop it. The tradeoff is that you own the property sooner but you also own any problems with it — liens, code violations, environmental damage — when ready.

Some states use a hybrid system where you receive a certificate first, but if the owner does not redeem within a set time, you can petition the court to foreclose and receive a deed. Check your state's tax assessor website or call your county treasurer to find out which system applies where you are buying.

What happens after you win the bid

You pay the county within the time frame they set — usually the same day or within three business days. The county records your certificate or deed and sends you documentation. In a certificate state, you now wait for the redemption period to end. During this time, you can contact the property owner and offer to buy the property outright, or you can straightforward wait and collect interest if they pay you back.

If the owner does not pay by the end of the redemption period (or when ready in a deed state), you own the property. At this point, you can sell it, but you will need to clear any title issues first. If there are other liens or code violations, you may need to pay those off or negotiate with the city before you can sell. Many properties that seemed like bargains at auction turn out to cost thousands more to make saleable.

In a certificate state, if you want to foreclose and take ownership before the redemption period ends, you can petition the court, but this requires hiring an attorney and costs money. Most investors wait out the redemption period rather than foreclose early.

Common mistakes that cost money

The biggest mistake is bidding on a property without checking for other liens. If a property has a $30,000 mortgage and $5,000 in back taxes, and you bid $10,000 for the tax lien, you will eventually have to pay off the $30,000 mortgage to take ownership. You lose money when ready.

Another common mistake is underestimating the cost of repairs or code violations. A property that looks cheap at auction may have foundation problems, roof damage, or code violations that cost $20,000 to $50,000 to fix. By the time you own it and fix it, you have spent far more than you would have spent buying a normal property on the market.

A third mistake is not understanding your state's redemption period. In a long-redemption-period state like Florida, you may wait five years to own the property while the owner pays you interest. During that time, you cannot sell it, rent it, or develop it. Your money is tied up, and you earn only the interest rate set by law, which may be lower than you could earn elsewhere.

Finally, many people bid emotionally at auctions and pay more than the property is worth. Set a maximum bid before you arrive and stick to it. If you go over that number, you have already lost money.

How to find the auction list and register

Start by calling your county treasurer's office or visiting their website. Ask for the tax lien sale schedule and the list of properties. Many counties post lists online; some mail them or require you to pick them up in person. The list usually comes out 30 to 90 days before the sale.

Once you have the list, research the properties you are interested in using the steps described above. Then contact the county to register for the auction. Registration requirements vary — some counties require you to show up early on auction day with a deposit check, others let you register online weeks in advance. Ask about payment methods, deposit amounts, and whether online bidding is available.

If your county does not hold auctions or has already held this year's sale, ask when the next one is scheduled. Most counties hold one sale per year, but some hold multiple sales or hold sales on demand when enough properties accumulate.

Frequently Asked Questions

Can I bid online, or do I have to go to the courthouse?

It depends on your county. Some counties now use online bidding platforms where you can bid from home; others require you to bid in person at the courthouse. Call your county treasurer to find out. Even if online bidding is available, you may still need to register in advance and provide a deposit.

What if I win the bid but cannot pay within the important date?

You will lose your deposit and forfeit the property. The county will re-auction it or move to the next bidder. Never bid more than you can pay when ready. Have the money ready before the auction starts.

Do I have to pay property taxes on the property while I hold the certificate?

In most certificate states, no — the county collects taxes from the owner during the redemption period. In deed states, yes — you own the property, so you owe taxes. Check your state's rules before you bid.

What if the property is occupied by someone living there?

In a certificate state, the occupant can stay during the redemption period. In a deed state, you may need to evict them after you take ownership, which costs money and takes time. Always find out whether a property is occupied before you bid.

Can I back out after I win the bid?

No. Once you are the highest bidder, you are legally obligated to pay. The only exception is if the county made an error in the sale process, which is rare. Treat every bid as final.