Paying the Delinquent Tax and Collecting Statutory Interest
When an owner fails to pay property taxes, many jurisdictions sell the debt to an investor who pays the tax and receives a lien. The owner repays with interest, and if they do not the investor may eventually take the property.
A Government Selling Its Receivable
Property taxes fund local services on a budget set in advance, so a municipality cannot simply wait for delinquent owners to pay. It needs the money now.
Many jurisdictions solve this by selling the delinquent tax obligation. An investor pays the taxes owed and receives a tax lien certificate, a claim against the property for the amount paid plus statutory interest.
The municipality has its revenue immediately, the collection problem transfers to a private party, and the delinquent owner now owes an investor instead of the county.
Two Different Systems
Jurisdictions use one of two approaches and confusing them leads to serious errors.
| Tax Lien Sale | Tax Deed Sale | |
|---|---|---|
| What is sold | The lien, a debt claim | The property itself |
| Investor receives initially | Interest income | Title, subject to redemption |
| Owner right to redeem | Yes, for a statutory period | Varies, sometimes none |
| Investor objective | Yield | Acquire real estate |
In a lien state, the overwhelming majority of certificates are redeemed, meaning the owner pays the taxes and interest and the lien is discharged. The investor never comes near owning property and earns a fixed return.
In a deed state, the investor is buying real estate at auction and the analysis is a property analysis rather than a credit one.
The Return Is Set by Statute
The interest rate on a tax lien is fixed by law rather than negotiated, and statutory rates in some jurisdictions are high, reaching into the mid teens or above on an annual basis.
Because the rate is fixed and attractive, competition among bidders is expressed differently. Auction formats include bid down the interest rate, where bidders compete by accepting a lower yield; premium bidding, where bidders pay above the lien amount, reducing effective yield; and random selection among bidders willing to accept the statutory rate.
In competitive jurisdictions, institutional bidders have driven realised yields far below the headline statutory rate, which is the ordinary consequence of a fixed return meeting an open auction.
The advertised statutory interest rate is what the delinquent owner pays. What the investor earns after bidding down or paying a premium is frequently a fraction of it, and the gap is the reason the advertised rate keeps attracting new participants.
The Security Position Is Unusually Strong
What makes the asset genuinely attractive is priority. Property tax liens generally hold super priority, ranking ahead of mortgages and most other liens.
A mortgage lender therefore has a strong incentive to pay delinquent taxes on properties it has lent against, and servicers routinely do, which is one reason redemption rates are high. The lender is protecting a much larger claim by satisfying a small senior one.
That priority is also what makes the eventual remedy meaningful. If the lien is not redeemed within the statutory period, the holder may foreclose, and the foreclosure can extinguish junior interests including mortgages.
Where It Goes Wrong
The obvious hazard is that a small tax debt can result in the loss of a valuable property, and that hazard has produced documented abuse.
Investigations have found cases where liens for small amounts, sometimes a few hundred dollars, resulted in foreclosure against elderly or vulnerable owners who did not understand the notices, and where fees and costs added to the lien balance made redemption unaffordable.
Bid rigging has also been prosecuted, with investors agreeing in advance not to bid against each other at tax lien auctions, which defeats the bidding down mechanism and preserves high yields at the expense of delinquent owners.
The most significant legal development came in 2023, when the Supreme Court held that a jurisdiction retaining surplus equity above the tax debt after taking a property constituted a taking without just compensation. Several states had permitted the government or lienholder to keep the entire value of a property seized for a small debt, and that practice is now unconstitutional.
That decision reshaped several state statutes and remains the most important consumer protection in this area.
What an Investor Actually Faces
The practical difficulties are more mundane than the headline yield suggests.
Due diligence is required on each parcel, because a lien on a contaminated site, a landlocked parcel, or a structure with no value is a lien that may not be worth foreclosing. Investors who bid blind on lists acquire liens on worthless land.
Subsequent taxes generally must be paid by the certificate holder to protect its position, which requires ongoing capital.
Foreclosure is a legal proceeding with its own cost and timeline, and the notice requirements are strict for the same reasons they are strict in quiet title.
Redemption timing is unpredictable, so cash flow is uncertain even when the outcome is favourable.
The Bottom Line
Tax lien investing exists because municipalities need revenue on schedule and are willing to sell the collection problem, and it offers a statutorily fixed return secured by a claim that outranks the mortgage. Most liens redeem and the investor earns interest, which is the ordinary outcome and the boring one. The extraordinary outcome, acquiring a property for a fraction of its value, is what draws attention and is exactly what the surplus equity ruling has now constrained.