You make money from tax liens in one of two ways: you collect statutory interest when the delinquent property owner pays the county to clear the lien, or, if the owner never pays, you foreclose and take the property itself. Interest is the ordinary outcome and the reason most investors show up; foreclosure is the rare, higher-return, higher-cost fallback. Statutory rates run anywhere from 8% to 24% depending on the jurisdiction, and the debt is secured by real estate, which is what draws people in. What keeps this from being easy money is that the certificate is only as good as the property behind it, and several legal mechanisms can freeze your capital or unwind your claim after you’ve paid.
One boundary first. Roughly half the states sell tax lien certificates and roughly half sell tax deeds, with a handful doing both. In a deed state you are buying the property itself at auction, not a debt, and the risk profile is entirely different. Everything below is about lien certificates.
The Two Ways a Certificate Pays
When you hold a certificate, the owner enters a statutory redemption period that runs anywhere from six months to three years depending on the jurisdiction. During that window they keep the property but owe the county the full delinquent amount plus your interest to clear the lien. The county collects and pays you.
Interest usually accrues as a simple annual rate, though some jurisdictions calculate it in six-month increments or apply a flat penalty per period. Some sweeten the deal with minimum-interest provisions so that even if the owner redeems in the first month or two, you collect a minimum penalty for tying up your money. Most certificates get redeemed, because the owner, their mortgage lender, or another interested party would rather pay the back taxes than lose the property.
The second path is foreclosure, which only matters when redemption doesn’t happen. That is where the potential returns jump and where the complexity and cost jump with them.
Picking a Lien Worth Buying
Most tax lien investors who lose money skipped the homework. Your county treasurer or tax collector publishes a delinquent tax list before each sale, and every parcel carries a unique number you can run through the county assessor’s records to pull the assessed value.
Compare that value to the tax debt. A $3,000 certificate on a $150,000 property gives you plenty of collateral. An $8,000 debt on a $10,000 vacant lot leaves almost no margin. Then look at the property itself, either in person or through satellite imagery. Condemned structures, environmental damage, or a location no one would buy at a discount all mean the collateral is fiction. Homes in reasonable condition in populated areas are the safest bets. Raw land in declining areas is where investors get stuck holding certificates on property nobody wants to redeem or own.
Competing Liens
A tax lien generally sits at the top of the priority stack, ahead of mortgages and most other claims. Federal tax liens filed by the IRS are the exception worth investigating: a properly filed IRS lien can complicate your priority, and the federal government keeps a separate right to redeem after a tax sale that can delay or unwind your foreclosure. Municipal liens, homeowners association assessments, and utility liens can also survive a tax foreclosure in some jurisdictions, adding thousands to your costs if you end up with the property. A title search before you bid is the only way to know what you are walking into.
Environmental Contamination
This is the risk that can turn a profitable certificate into a financial catastrophe. If you foreclose and take title, you can be held liable for environmental cleanup costs under the federal Comprehensive Environmental Response, Compensation, and Liability Act, even if the contamination happened decades before you acquired the property. Courts have ruled that acquiring property through a tax sale creates a sufficient connection to the prior owner’s contamination to trigger liability. Former gas stations, dry cleaners, industrial sites, and properties near agricultural operations all warrant extra scrutiny.
How the Auction Works
Before you can bid, you register with the local tax office. Registration typically requires your Social Security Number or corporate Tax Identification Number for IRS reporting, verified contact information, and often a refundable deposit. The certificate is issued in whatever legal name you register under, so get it right the first time; corrections cause headaches for redemption and foreclosure later.
Auctions follow one of two formats. The more common is a bid-down-the-interest auction. Bidding opens at the maximum statutory rate, which might be 18% in one state and 12% in another, with a few states allowing rates above 20%. Investors compete by offering to accept a lower return, and the certificate goes to whoever will take the smallest interest rate. In competitive markets, rates get bid down into single digits or even zero.
The alternative is premium bidding. The interest rate stays fixed and investors bid a cash amount above the actual tax debt. The premium typically is not recoverable if the owner redeems, so factor it into your return before you raise your hand.
Auctions run in person at a county office or through online portals. Either way, the winning bidder pays quickly, usually within 24 to 48 hours by electronic transfer, cashier’s check, or a pre-funded account. Miss the deadline and you forfeit the bid and risk being barred from future sales.
Paying Subsequent Taxes
Something that catches first-time investors off guard: in many jurisdictions you have to pay subsequent years’ taxes on the same parcel to maintain your lien position. If you hold a certificate from 2025 and the 2026 taxes go unpaid, another investor could buy that newer lien and complicate your claim. Paying those subsequent taxes adds to your total investment, but the amount typically gets rolled into what the owner owes at redemption. Budget for this ongoing cost, especially on properties where the owner is clearly in financial distress.
When Redemption Doesn’t Come
If the redemption period expires without payment, you can pursue the property. Foreclosure begins with a formal petition, sometimes called “barring the right of redemption,” filed in the local civil court. You need a title search to identify every party with a legal interest — mortgage holders, other lienholders, judgment creditors — and you have to serve each of them with notice, typically by certified mail and publication. Due process is not optional here. Courts have invalidated tax foreclosures where necessary parties were not properly notified.
After the notice period, a judicial officer or tax official reviews the petition, verifies you have met all requirements (including payment of subsequent taxes), and issues a new deed conveying ownership to you, often free of prior encumbrances like mortgages and judgment liens. Filing fees vary widely, and you should budget separately for the title search, service of process, and legal fees if you use an attorney.
Quiet Title and Getting Anyone to Buy From You
A tax deed does not automatically give you clean, marketable title. Title insurance companies routinely refuse to insure properties acquired through tax sales without a quiet title action, a separate court proceeding that formally extinguishes all prior claims. Until you complete that step, selling or refinancing is difficult. Quiet title actions add several months and typically several thousand dollars in legal fees. If the former owner or a tenant is still living there, you also have to go through formal eviction. You cannot change the locks.
Legal Risks That Can Freeze or Kill Your Return
Bankruptcy Automatic Stay
If the owner files for bankruptcy at any point before you complete foreclosure, an automatic stay halts all collection activity against the debtor’s property. Your foreclosure petition stops in its tracks. A Chapter 7 case generally delays rather than permanently prevents foreclosure; the stay lifts when the case closes. Chapter 13 is more problematic because the debtor proposes a three-to-five-year repayment plan that may allow them to catch up on delinquent taxes through the plan. Either way, your capital is frozen for months or years. You can file a motion to lift the stay, but you have to show cause and success is not guaranteed.
The IRS Right of Redemption
When an IRS tax lien exists on the property, the federal government has its own right to redeem after your foreclosure sale. Under 26 U.S.C. § 7425, the government gets 120 days from the sale date or whatever redemption period local law allows for other secured creditors, whichever is longer, to step in, repay you, and take the property.1Office of the Law Revision Counsel. 26 U.S. Code 7425 – Discharge of Liens You get your money back but you lose the property, which is another reason to check for federal liens before bidding.
Surplus Equity After Foreclosure
In 2023, the Supreme Court ruled in Tyler v. Hennepin County that a government cannot seize property worth far more than the tax debt and keep all the proceeds. The Court held that retaining the excess value above what is owed violates the Takings Clause of the Fifth Amendment.2Supreme Court of the United States. Tyler v. Hennepin County, Minnesota, et al. Jurisdictions are revising their procedures so former owners can claim surplus proceeds, and some states now require foreclosure sales be conducted to capture fair market value rather than just covering the debt. If you are counting on acquiring a $200,000 property for $5,000 in back taxes, the legal ground under that strategy is shifting.
How the IRS Taxes What You Earn
The IRS treats interest on tax lien certificates as ordinary income, taxed at your regular rate like bank interest or bond coupons.3Internal Revenue Service. 1099-INT Interest Income You may receive a Form 1099-INT from the county, but you have to report the income either way. If your total taxable interest exceeds $1,500 for the year, you file Schedule B with your return.4Internal Revenue Service. Instructions for Schedule B (Form 1040)
If you foreclose and acquire the property, your cost basis is generally the total amount you paid: the original lien, subsequent taxes, penalties, fees, and foreclosure costs. Profit above that basis when you sell is taxable, and how it is taxed depends on whether the IRS considers you an investor or a dealer. Courts have treated properties acquired by regular tax lien foreclosers as inventory, meaning profits are ordinary income subject to self-employment tax. Occasional properties held as long-term investments may qualify for capital gains rates.
One boundary on tax planning: tax lien certificates themselves almost certainly do not qualify for a 1031 like-kind exchange. Section 1031 explicitly excludes “stocks, bonds, or notes” and “other securities or debt,” and a certificate is fundamentally a debt instrument.5IRS.gov. Like-Kind Exchanges Under IRC Section 1031 Real property you acquire through foreclosure is real property, and a 1031 exchange of that for other real property could qualify if you meet the holding-period and intent requirements.
The Costs You Have to Beat
Tax lien investing looks better on paper than in practice if you do not account for all the costs. Beyond the certificate itself, expect some combination of the following:
- Non-refundable registration fees to participate in auctions, plus refundable deposits that tie up capital during the sale.
- Subsequent years of property taxes you may need to pay to protect your lien position, with no guarantee of when you get reimbursed.
- Court filing fees, title search charges, certified mail and publication costs for serving notice, and attorney fees if the foreclosure is contested. Filing fees alone can run from a couple hundred dollars to well over a thousand depending on the jurisdiction.
- A quiet title action after foreclosure to make the property insurable, often several thousand dollars in legal fees.
- Recording fees for the new deed, typically modest.
- Carrying costs on any property you end up owning: taxes, insurance, maintenance, and securing it against vandalism.
On a certificate that earns $600 in interest over two years and gets redeemed, most of these costs never appear. On a certificate you end up foreclosing on, especially one attached to a low-value property, they can easily exceed what the property is worth. Investors who do well at this treat it like a business. They track every dollar, know their jurisdiction’s fee schedules cold, and walk away from certificates where the math does not hold up after expenses.