Can you lose money on a tax lien certificate?

Yes. If the property owner never redeems and the property is worth less than what you've invested — including any prior-year liens you had to pay to keep your position — you can end up with an unrecoverable loss. A certificate on a demolished structure or a landlocked parcel with no resale value is effectively worthless even if the interest rate looked attractive.

Do you have to attend the auction in person?

It depends on the state. Florida, Arizona, and several other states run fully online auctions you can participate in from anywhere. New Jersey and Illinois still hold many in-person county auctions, though some counties have moved online post-pandemic. Check each county's treasurer or tax collector website 30–60 days before the scheduled sale date.

What happens to the existing mortgage when you foreclose on a tax lien?

In most states, a properly executed tax deed foreclosure wipes out junior liens, including first mortgages — which is what makes tax liens senior to most other claims. However, the lender almost always redeems before foreclosure is complete because losing the collateral on a mortgage is catastrophic for them. That's actually the main reason most liens redeem: institutional lenders are monitoring for delinquency and will pay the bill.

How do you find out which counties are holding sales and when?

Each county sets its own sale schedule, and there's no single national database. Most county treasurer or tax collector websites post sale dates and property lists 30–90 days in advance. Some states, like Florida, aggregate listings on the county's property appraiser site. Paid platforms that track upcoming sales across multiple states can save significant research time if you're working more than one market.

Are tax lien certificates available in every state?

No. States are divided between tax lien states and tax deed states. In a tax deed state — like California, Georgia, and Michigan — the county forecloses internally and sells the actual property, not a certificate. About 29 states plus Washington D.C. sell lien certificates; the rest sell deeds directly. A few states use a hybrid system where you bid on a deed but with a right of redemption still attached.

How Does Tax Lien Investing Work

Tax lien investing works by paying a delinquent property owner's unpaid taxes in exchange for a lien certificate that earns interest — and sometimes leads to property ownership if the owner never repays you. Counties need that tax revenue immediately, so they sell the debt to private investors rather than waiting years to collect it. You step in, pay the bill, and the property owner must repay you at a state-mandated interest rate before they can clear the title.

What You Actually Buy at a Tax Sale

You're not buying property. You're buying a lien — a legal claim against the property for the unpaid tax debt. That certificate entitles you to collect the original tax amount plus accrued interest once the owner redeems it. If they never redeem, most states let you initiate a foreclosure process to take the deed.

The certificate itself is recorded in the county's official records, which is what gives it priority over most other liens. Mortgage lenders know this, which is why most of them pay taxes from escrow before a lien ever goes to sale.

How the Auction Works

Counties run tax lien auctions in one of three formats: bid-down-the-interest, premium bidding, or random selection. In a bid-down-the-interest state like New Jersey, you start at the statutory maximum — 18% — and investors compete by accepting lower rates. A competitive certificate in a New Jersey county might sell at 0% to 3% interest because so many bidders want it.

In a premium-bidding state like Illinois, you bid cash above the face value of the lien. Illinois allows up to 36% interest on the certificate, but if you overbid by $2,000 on a $1,500 tax bill, you've spent $3,500 to earn interest only on the $1,500 — your effective yield drops sharply. Always calculate yield on total cash deployed, not just the certificate face value.

Florida uses an online auction system through RealTdm or similar platforms. Bidding opens and closes on a set schedule, and you can screen properties from home before placing a bid.

The Redemption Period

After you buy the certificate, the property owner has a set window — called the redemption period — to repay the taxes plus your interest. Redemption periods vary widely: Iowa gives owners just 1 year and 9 months, while Texas redemption periods for homestead properties run 2 years. Most states fall somewhere between 1 and 3 years.

During that time, you receive nothing. Your money sits in the lien earning interest on paper. When the owner pays, the county sends you a check that includes both your principal and the accrued interest. The annualized return feels different depending on when in the period they redeem — early redemption in the first few months often means a very high annualized yield because interest sometimes accrues in flat penalty amounts rather than daily accrual.

Tip: In Florida, interest accrues in a minimum lump sum of 5% regardless of how quickly the owner redeems — so an owner who redeems 30 days after the sale still pays you that full 5%, making short-redemption certificates more lucrative on an annualized basis than the stated certificate rate suggests.

What Happens If the Owner Doesn't Redeem

If the redemption period expires with no payment, you have the right to apply for a tax deed or begin a foreclosure action — depending on the state. This is where investors either make serious money or discover problems they missed.

In Florida, you apply to the county for a tax deed auction. The property goes back to public sale, and you're reimbursed from the proceeds before the former owner gets anything. You don't automatically get the property — other bidders can outbid you.

In states like Illinois and Indiana, you can file for a tax deed directly after the redemption period, but that process requires a quiet-title action to clear the chain of title, which typically runs $1,500–$4,000 in attorney fees and 6–18 months of court time.

Title companies won't insure a tax deed without a quiet-title action in most states, which matters if you ever plan to sell or refinance.

How to Evaluate a Certificate Before Bidding

The lien is only as good as the property securing it. If the property is worth less than the total lien amount — your certificate plus any senior liens — you could end up holding an unrecoverable position. A $4,000 tax lien on a condemned mobile home on a $3,000 lot is not a good investment, even at 18% interest.

Pull the parcel record from the county assessor before bidding. Check the assessed value, any senior tax liens from prior years, and whether the property is a buildable lot or a landlocked parcel. On taxsaleninja.com's Illinois state guide, you'll find specific filters and databases used for exactly this kind of pre-auction screening.

Also check for IRS federal tax liens. A federal lien survives most state tax deed processes and can cloud your title even after foreclosure.

What Returns Look Like in Practice

A realistic portfolio return for a disciplined tax lien investor runs between 8% and 16% annually, accounting for certificates that redeem at 0% because of competitive bidding, administrative costs, and the occasional certificate on a worthless parcel that never redeems and never produces a usable deed. New Jersey and Florida are the most competitive markets, often driving effective yields below 5% on desirable properties.

Smaller counties in states like Iowa, Indiana, and Mississippi see less institutional competition. A solo investor working rural Iowa counties can still regularly buy certificates at the full statutory rate — currently set at 2% per month in Iowa — without fighting hedge funds for inventory. That monthly rate compounds to roughly 24% annualized if the certificate runs a full year.

The math works. But it requires county-level research, consistent attendance, and a realistic view of which properties are worth securing.