Over-the-Counter (OTC) Tax Liens Explained
Not every certificate a county tries to sell at its annual tax sale finds a buyer. Low-value parcels, oddly shaped lots, or properties with obvious problems can go through an entire live auction without a single bid. What happens to those leftover certificates — and how you can buy them afterward — is what "over-the-counter" (OTC) tax liens are about.
What OTC actually means
After the live auction closes, states that allow it let the county sell unsold certificates directly, first-come first-served, usually year-round rather than on a single sale date. There's no bidding — you pay the county the certificate's face value (back taxes plus accrued interest and fees) and receive it at the statutory maximum rate, since there was no bid-down process to lower it. Not every state offers OTC liens; it's specific to certain tax-lien states and varies significantly county by county even within a state that allows it.
Why the yield math looks better — and often isn't
OTC certificates carry the full statutory rate with no auction discount, which on paper looks like the best deal available: no competition, maximum rate, buy any time. In practice, there's a reason these certificates went unsold at the live auction — and it's rarely random. Parcels that reach OTC status skew toward the properties serious bidders already passed on: landlocked lots, easement-only strips, severely blighted structures, or parcels worth less than the tax debt itself. A high statutory rate on a certificate that never redeems and isn't worth foreclosing on isn't a return at all.
The due diligence is on you, not the county
At a live auction, the fact that other bidders are willing to compete for a certificate is itself a (imperfect) signal that the parcel has real value. OTC removes that signal entirely — you're the only one deciding whether the parcel is worth the certificate's face amount. That makes the due diligence step non-negotiable rather than optional: pull the parcel on the county GIS viewer, check its size and access, and search for other recorded liens before paying anything. County tax offices selling OTC certificates generally won't warn you off a bad parcel — they're collecting delinquent taxes, not vetting investments.
Where OTC liens fit in a strategy
Experienced investors don't dismiss OTC lists outright — occasionally a decent parcel slips through simply because the live auction had limited attendance that year, or a bidder ran out of capital before reaching it. The realistic approach is treating an OTC list as a much lower hit-rate version of the live auction: worth scanning for genuine outliers, not worth buying in bulk on the assumption that an unsold certificate is a hidden bargain by default.
This article is general information, not financial or legal advice. Whether a state or county offers OTC liens, and the exact process for buying them, varies — always confirm directly with the specific county's treasurer or tax collector office.