To buy over-the-counter tax liens, you pull the county treasurer’s list of certificates that didn’t sell at the last tax auction, investigate the property behind any lien that interests you, then submit an application and guaranteed funds for the exact payoff amount to the taxing authority. The transaction happens at the county office on a first-come, first-served basis, with no bidding and no competing investors. Because these certificates drew no interest at auction, they typically carry the maximum interest rate the state allows, and they typically sit on properties that need a careful second look.
First, Confirm Your State Sells Tax Lien Certificates
Roughly half the country uses a tax lien system, where investors buy the delinquent tax debt and earn interest while waiting for the owner to pay. The rest use tax deeds, where the government sells the property itself, not the debt. A handful of states use both or a hybrid redemption deed.
Arizona, Colorado, Florida, Illinois, Indiana, Iowa, New Jersey, and about two dozen other states run active tax lien systems. In tax deed states like California, Texas, and Michigan, over-the-counter tax liens don’t exist as a product. Your county treasurer’s or tax collector’s website will state plainly what type of sale the county conducts. Check that before anything else.
Where the Unsold Liens Live
When a lien is offered at auction and nobody bids, it gets “struck off” to the county or state, which becomes the lienholder by default. From there the certificate moves into an administrative inventory that eventually opens to walk-in buyers. Some counties release these liens almost immediately after the sale closes; others impose a waiting period during which the county decides whether to hold or waive the property itself.
County treasurers and tax collectors keep these inventories under names like “Struck-to-County” lists, “Lands Available for Taxes” ledgers, or plainly “over the counter” lists. Many counties publish them online in a database you can sort by parcel number, address, or lien balance. If it isn’t online, request a copy in person at the tax office. Lists refresh as owners redeem old debts and new unsold liens roll in from the most recent auction cycle, so the better certificates tend to move quickly.
A few private platforms aggregate OTC data across counties, but participation often requires accredited investor status, and the actual purchase still runs through the county. Use them as a search tool, not a substitute.
Do the Homework the Auction Crowd Skipped
These liens went unsold for a reason. Experienced bidders passed. Before you commit money, work through the property yourself.
- Run a title search. A clouded title, an outstanding mortgage, or a competing mechanic’s lien can create real problems if you ever foreclose and take the property.
- Look at the property. Visit if you can, or at least pull recent satellite and street-level imagery. Photos from old listings may be years out of date. Some OTC parcels are vacant lots, abandoned structures, or buildings in severe disrepair.
- Screen for environmental contamination. Under federal law, owners of contaminated property can be held liable for cleanup costs. Former gas stations, dry cleaners, and industrial sites carry the sharpest exposure.1Office of the Law Revision Counsel. 42 U.S. Code 9607 – Liability
- Compare the lien to the property value. A $3,000 lien on a $150,000 house is a very different bet than a $3,000 lien on a $4,000 vacant lot in a declining area.
- Check for other government obligations. Unpaid water and sewer bills, code enforcement fines, and special assessments can pile onto your costs if the property eventually lands in your hands.
The appeal of OTC liens is the absence of competition. That also means no crowd of informed bidders has validated the opportunity. You are the entire diligence department.
How the Purchase Works
Pull the Right Numbers
Start with the Parcel Identification Number, sometimes called the Assessor’s Parcel Number. It is the unique code that identifies the property in tax records, and you’ll find it on the county’s OTC inventory list or through the assessor’s online database.
Most counties require a formal purchase application, available as a download from the treasurer’s site or as a paper form at the office. The application asks for the exact lien amount: the base delinquent tax plus accrued interest and administrative fees. That figure changes daily as interest accrues, so confirm the current balance on the day you submit. You’ll also identify the tax year of the delinquency. The county will ask for your Social Security number or federal tax identification number, because it has to report your interest income to the IRS.
Submit the Application and Pay
Delivery channels vary. Some offices accept walk-in purchases with same-day payment. Others require certified mail or a secure online portal. Accepted payment methods are almost always limited to cashier’s checks, money orders, or wire transfers. Personal checks are rarely accepted because the county needs guaranteed funds.
Once payment clears, you receive a confirmation receipt. The official tax lien certificate, your legal proof that you now hold the debt, typically arrives by mail in two to six weeks depending on processing volume. Keep it somewhere safe. You’ll need it if the property owner redeems or if you eventually pursue foreclosure.
What You Earn and When You Get Paid
At a live auction, bidders usually drive the interest rate down from the statutory maximum. OTC certificates skip that process, so they generally carry the full statutory rate. Statutory rates run from around 8% to 10% on the low end up to 18% to 24% in higher-rate states, with a few jurisdictions going higher still. That rate accrues on your invested capital until the owner redeems or the redemption period expires.
Redemption is what most lien investors actually want. The owner walks into the tax office, pays the full lien balance plus interest and penalties, and clears the debt. The county then sends you your principal and earned interest, usually by check. Redemption periods range from six months in some states to as long as four years in others, with one to three years being the most common window.
While you wait, you may have the option to pay subsequent years’ property taxes on the same parcel if the owner keeps falling behind. Doing so adds to your lien position and earns additional interest, but it also concentrates more of your money on a single property. Whether that’s the right move depends on the diligence you did up front.
If the Owner Never Redeems
When the redemption period expires without payment, you gain the right to pursue a tax deed or initiate foreclosure, depending on your state’s process. Nothing happens automatically. You have to file an application with the county, pay the required fees, and give proper notice to everyone with a recorded interest in the property: the owner, any mortgage lender, other lienholders, and in some cases occupants.
Notice is where deeds get overturned. The Supreme Court has held that when a government’s initial attempt to notify a property owner fails, additional reasonable steps are required before a tax sale proceeds.2Justia Law. Jones v. Flowers, 547 U.S. 220 (2006) If certified mail comes back unclaimed, that can mean regular mail, posting notice on the property, or addressing a letter to “occupant.” Cutting corners is one of the fastest ways to lose the deed you just paid to obtain.
Even after you get a tax deed, your title may not be marketable. Title insurance companies often refuse to insure property acquired through a tax sale without a quiet title action, a court proceeding that formally extinguishes competing claims. Attorney fees for a quiet title action after a tax sale commonly run between $1,500 and $8,000 and take at least a few months. Without it, selling the property at fair market value becomes very difficult.
Risks That Can Eat the Yield
The interest rate on paper is not the return. Several things can move the real number down, sometimes below zero.
Bankruptcy. If the owner files, the automatic stay immediately halts your ability to foreclose or collect until the bankruptcy court lifts the stay or the case resolves.3Office of the Law Revision Counsel. 11 U.S. Code 362 – Automatic Stay Property tax liens generally hold strong priority, but the delay alone can tie up your capital for months or years.
Environmental liability. If you foreclose and take title to a contaminated site, federal law can treat you as the responsible owner for cleanup costs.1Office of the Law Revision Counsel. 42 U.S. Code 9607 – Liability Cleanup obligations can dwarf the value of the property. This is the single biggest financial risk in tax lien investing and the one beginners most often overlook.
Worthless collateral. Your lien is secured by real property, but real property includes vacant lots worth less than the lien balance, structures that would cost more to demolish than the land is worth, and parcels with access or zoning problems. If the owner never redeems, the math has to still work after foreclosure costs, quiet title fees, insurance, and ongoing taxes.
Federal tax liens. If the IRS has recorded a lien against the owner, priority matters. Local property tax liens generally take priority over federal tax liens under IRC 6323(b)(6), even when the federal lien was recorded first.4Internal Revenue Service. Federal Tax Liens Priority disputes can still slow foreclosure.
Long timelines. Between the redemption period, any bankruptcy delay, the foreclosure process, and quiet title, years can pass before you see a return. This is not a short-term play.
Tax Reporting on What You Earn
Interest earned on a tax lien certificate is ordinary income on your federal return. When an owner redeems and you receive interest, the county typically issues a Form 1099-INT if the interest paid is $10 or more.5Internal Revenue Service. About Form 1099-INT, Interest Income You owe tax on the interest whether or not a 1099 shows up. If you acquire property through foreclosure and later sell it, the sale is a capital transaction, and your basis is generally what you paid for the lien plus foreclosure and legal costs.
Keep detailed records of every purchase, every subsequent tax payment, every fee, and every legal cost tied to a certificate. Those records establish basis and protect you if the numbers are ever questioned.