Tax lien.
What it actually means.

What the investor owns

A debt secured by the property, not the property. You are stepping into the county’s shoes: it wanted its tax revenue now, you supplied it, and in exchange you hold a claim that generally sits ahead of most other liens. You are not a landlord, you collect no rent, you have no right to enter, and you are not responsible for the roof. What you have is a position that either gets paid off with interest or, far less often, converts into a path toward ownership. Understanding that distinction is what keeps investors from bidding on liens as though they were buying houses.

How the return is set

The headline rate is statutory, but the auction format determines what you actually earn. Some states bid the interest rate down, so a nominal maximum can be competed to a fraction of it. Others use premium bidding, where you pay more than the lien amount and the excess may earn nothing at all. Many require the holder to pay subsequent years’ taxes to preserve priority, which adds capital at a time you did not choose. Model the realistic outcome for the specific county’s format rather than the advertised statutory rate, and remember that a redeemed lien can pay off in weeks, which shortens the period over which any premium is recovered.

Return if redeemed ≈ lien amount × statutory interest rate × time held, subject to that state’s rules on penalties, subsequent-year tax payments, and bid-down or premium bidding formats.

Why most liens never become property

The large majority redeem. Owners and their mortgage servicers rarely allow a tax claim to consume a property with equity, so the ones that survive to foreclosure are disproportionately the parcels nobody wanted — landlocked slivers, contaminated sites, structures worth less than the demolition. That is why due diligence matters even when you are only buying a debt: research the parcel before bidding, price the possibility of ending up with it, and treat the interest as the expected return with ownership as a tail scenario. Procedure differs enough between states that experience in one market transfers poorly to the next.

Capital and time

Liens are a fixed-income strategy wearing real estate clothing. The capital goes out at auction, comes back on someone else’s schedule, and earns nothing while it waits for the next sale. Many states hold auctions once a year, so deploying meaningful money means either committing to a calendar across several counties or accepting long idle periods. Investors who like the risk profile treat it as a place to park capital at a defensible return, not as an inexpensive way to acquire property.