A tax sale property is real estate that a local government auctions off to collect unpaid property taxes. Depending on where the property sits, the government either sells the tax debt itself, in the form of a lien certificate, or sells the property outright through a tax deed. Roughly half the states use lien sales, most of the rest use deed sales, and a few use both. The difference shapes almost everything that follows: what the buyer actually owns, how long the former owner has to get the property back, and what other claims survive the sale.
Tax Lien Sales and Tax Deed Sales Are Not the Same Thing
Confusing the two is the most common mistake at the auction table.
Tax Lien Sales
In a lien sale, the government sells the right to collect the delinquent tax debt. The buyer pays the owner’s tax bill and receives a tax lien certificate. The original owner keeps possession of the property and gets a redemption period, ranging from six months to four years depending on the jurisdiction, to pay the certificate holder back with interest. Statutory maximum interest rates run from about 8 percent in the lowest jurisdictions to 36 percent in the highest, though competitive bidding usually drives actual returns well below the cap.
If the owner redeems, the certificate is canceled and the buyer collects principal plus interest. If not, the certificate holder can file a foreclosure action to convert the lien into a deed and take ownership.
Tax Deed Sales
In a deed sale, the government sells the property itself. The winning bidder receives a deed transferring ownership, with no waiting period for the former owner to repay, because the pre-sale legal process has already extinguished their interest. In most jurisdictions a tax deed also wipes out existing mortgages and junior liens, provided the lender received proper notice and did not act. The buyer walks away as owner, though as covered below, that deed usually needs more legal work before the property can be sold or financed.
How the Auctions Work
Both types of sales are public auctions run by the local tax collector or treasurer, but the bidding mechanics differ.
Deed auctions are price auctions. The minimum bid usually covers the delinquent taxes, penalties, interest, and administrative costs; in some jurisdictions the floor is set at a percentage of assessed or fair market value. Bidders push the price up, and the highest bid wins.
Lien auctions can work two ways. In many jurisdictions, bidders compete downward on the interest rate they are willing to accept, and whoever will take the lowest rate wins. In others, bidders compete upward by offering a premium above the lien amount.
What Buyers Actually Get After the Sale
For lien buyers, the redemption period defines the investment. Many actually prefer redemption to foreclosure: it produces a predictable interest return without the effort of taking possession of a property they may never have seen. If the owner does not redeem, converting the lien into a deed requires a court foreclosure action, which adds legal costs and months of waiting.
For deed buyers, ownership transfers shortly after the auction, but the deed alone is often not enough. Title companies are reluctant to insure a tax deed because the sale process can leave ambiguities about whether every interested party was properly noticed. Most tax deed buyers end up filing a quiet title action, a court proceeding that eliminates competing claims. These take at least three months and can run several thousand dollars in legal fees, and that expense belongs in the investment math from the start.
What the Former Owner Gets Back
In 2023, the U.S. Supreme Court ruled in Tyler v. Hennepin County that a government violates the Takings Clause of the Fifth Amendment when it keeps sale proceeds beyond what the owner actually owed. The case involved a homeowner who owed roughly $15,000 in taxes on a home the county sold for $40,000 and kept the full amount. The Court held that the government could sell the property to recover what it was owed but “could not use the toehold of the tax debt to confiscate more property than was due.”1Supreme Court of the United States. Tyler v. Hennepin County, 598 U.S. 631 (2023)
If your property sold at a tax sale for more than the taxes, penalties, interest, and costs owed, you are constitutionally entitled to the surplus. Many jurisdictions previously kept the difference, so check whether yours now has a claim process and what the filing deadline is.
Federal Tax Liens and the IRS’s Redemption Right
A federal tax lien on the property does not automatically vanish at a local tax sale, and this catches buyers off guard.
Local property tax liens generally take priority over federal tax liens even when the federal lien was filed first, under 26 U.S.C. § 6323(b)(6).2GovInfo. 26 USC 6323 – Validity and Priority Against Certain Persons Priority is only half the story. Under 26 U.S.C. § 7425, the entity conducting the sale must give the IRS written notice at least 25 days beforehand if a federal tax lien is on record. Without that notice, the sale does not extinguish the federal lien, and the buyer takes the property subject to the debt. Even when notice is given properly, the IRS keeps the right to redeem the property within 120 days of the sale or the period allowed under local law, whichever is longer.3Office of the Law Revision Counsel. 26 USC 7425 – Discharge of Liens If it does, it pays the redemption amount and takes title. Before bidding, search the county records for any recorded federal tax lien on the property.
Environmental Liability Is the Biggest Hidden Risk
Under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), the current owner of a property where hazardous substances were released can be held liable for the full cost of cleanup, whether or not they caused the contamination.4Office of the Law Revision Counsel. 42 USC 9607 – Liability Federal courts have found that buying at a tax sale creates the kind of ownership that triggers this liability.
CERCLA has an “innocent landowner” defense, but the buyer has to prove they had no reason to know about contamination and that they conducted “all appropriate inquiries” into the property’s history before purchase.5Office of the Law Revision Counsel. 42 USC 9601 – Definitions Skip the environmental due diligence and you cannot claim the defense. Cleanup costs routinely run into six or seven figures. If the property was ever a gas station, dry cleaner, auto repair shop, or industrial site, environmental investigation before you bid is not optional.
Due Diligence Before You Bid
Tax sale properties are sold as-is, with no warranties about condition, legal status, or habitability. The government running the auction takes no responsibility for what you’re buying. Pre-sale research is your only protection.
- Run a title search at the county recorder’s office for outstanding liens, including federal tax liens, utility liens, HOA assessments, and other claims that may survive the sale. Some of these debts transfer to the new owner.
- Physically inspect the property, at minimum by driving by it. Many tax sale properties have been neglected for years. Some jurisdictions permit interior inspections; others do not.
- Check the property’s history and federal and state environmental databases for known contamination. Former commercial or industrial sites warrant a Phase I environmental assessment.
- Verify zoning classification and check for outstanding building code violations. Unpaid code enforcement fines can follow the property in some jurisdictions.
- Find out whether anyone is living there. An occupied property, whether by the former owner or a tenant, may require formal eviction proceedings after the sale.
Tax Treatment for Buyers
Interest earned on a tax lien certificate is taxed as ordinary income in the year you receive it, and the interest portion of any redemption payment is reportable on your federal return. If you foreclose and take ownership of the property, your cost basis is generally the amount you paid for the lien plus subsequent costs like foreclosure expenses and quiet title fees. For deed purchasers, the winning bid forms the initial cost basis, and recording fees and quiet title costs are typically added to it.