Tax lien & tax deed glossary
Plain-language definitions for the terms that come up across state auction notices and county sale rules — no jargon left unexplained.
Tax lien certificate
A document a county sells at auction giving the buyer the right to collect an unpaid property tax debt, plus statutory interest, from the property owner. It does not transfer ownership of the property — it's a claim against the debt, not the property itself.
Tax deed
A deed conveying ownership of the property itself, sold at auction to cover unpaid taxes. Unlike a lien certificate, the winning bidder becomes the owner (subject to any redemption rights that still apply in that state).
Redeemable deed
A hybrid: the winning bidder receives a deed at the sale, but the former owner keeps a window to buy it back — usually for the purchase price plus a fixed penalty, not annualized interest. Texas and Georgia are the two most common examples.
Redemption period
The window during which the property owner (or another interested party, like a lender) can pay off the debt and cancel the sale. Length varies enormously by state — from a few months to several years.
Bid-down auction
An auction format where investors compete by accepting a lower interest rate, starting from the statutory maximum. The lowest rate bid wins the certificate. Common in Florida, Arizona, and South Carolina.
Premium bidding
An auction format where, once the interest rate bids down to the statutory floor (often 0%), competition shifts to a cash premium paid on top of the lien. New Jersey uses this after its 18% rate floors out.
Upset price / minimum bid
The lowest amount a county will accept for a property or certificate — typically the total of back taxes, penalties, interest, and administrative costs owed.
Quiet title action
A lawsuit filed after winning a tax deed to get a court to formally rule the title valid and silence any competing claims. Often required before a title company will insure the property or a lender will finance it.
Certificate of purchase
The document issued to the winning bidder at a tax lien sale, proving their claim to the debt. Some states use this exact term (Missouri, for example); others just call it a "tax lien certificate."
Sheriff's sale
A property auction conducted by the county sheriff's office rather than the treasurer or tax collector — common in judicial foreclosure states like Texas and Delaware.
Judicial sale
A tax sale that goes through the court system rather than a purely administrative county process. Generally produces stronger title than an administrative sale, since a judge signs off on notice and procedure.
Delinquent tax
Property tax that hasn't been paid by its due date. Most states require a property to sit delinquent for a set period — often 1 to 3 years — before it becomes eligible for a tax sale.
Surplus funds / excess proceeds
The difference between what a property sells for at auction and what was actually owed in back taxes. Since the 2023 Supreme Court ruling in Tyler v. Hennepin County, states must return this surplus to the former owner rather than keeping it. See our article on surplus funds for the full breakdown.
Statutory interest rate
The rate set by state law that a tax lien certificate earns if redeemed — either a flat rate (Iowa's 24%, no bidding) or a ceiling that gets bid down at auction (Florida's 18% cap).
Treasurer's deed / Collector's deed
The deed a certificate holder can apply for once the redemption period closes without the owner paying — the mechanism that converts an unredeemed lien into ownership.
Repository sale
A secondary, often lower-bid sale for properties that went unsold at a county's regular tax sale. Pennsylvania's repository sales are a well-known example — first-come bidding rather than a live auction.
Over-the-counter (OTC) liens
Certificates that didn't sell at the live auction and remain available for purchase directly from the county afterward, usually at the statutory maximum rate with no bidding.
Due diligence
Research on a parcel before bidding — confirming it's a real, sellable property (not a sliver lot or landlocked parcel), checking for other liens, and verifying the numbers on the county's own auction notice.
Parcel
A single, legally defined piece of property, identified by a parcel number (APN) the county uses to track ownership and taxes.
Lien priority
The order in which competing claims against a property get paid. Property tax liens are almost always first-priority — they get paid before a mortgage — which is part of why a mortgage lender will often redeem a tax lien on a delinquent borrower's behalf.
These are general definitions — exact terminology and mechanics vary by state and county. Always confirm against the specific county's own auction notice before bidding. See all state rates for state-specific detail.