GUIDES · 8 MIN
Arizona tax lien sales explained: the February auction, over-the-counter liens, and the three-year clock
Arizona sells the lien, not the land. The interest rate is bid down from 16%, the owner has three years to redeem, and most of what is left on the shelf is vacant land. What the statutes actually say.
Arizona is a tax lien state. When property taxes go unpaid, the county Treasurer does not sell the parcel; it sells a certificate of purchase (CP) that gives the buyer a lien on the parcel, earning interest until the owner pays it off. Only if the owner never redeems can the lien holder foreclose and take the land. Understanding the mechanics explains why the over-the-counter lists are overwhelmingly vacant lots.
The calendar
- Taxes are due in two halves, October 1 and March 1 (A.R.S. § 42-18052). Delinquent taxes accrue 16% simple interest per year.
- In February each year, every county holds its tax lien sale for parcels delinquent as of the prior year (A.R.S. § 42-18112). Most counties now run it online.
- Bidding is on the interest rate, downward from 16% (A.R.S. § 42-18114). The bidder willing to accept the lowest rate wins the lien. On desirable parcels in Maricopa and Pima the winning bids are routinely in the low single digits; on rural vacant lots they often stay at 16% or draw no bid at all.
- Liens with no bidder are struck to the state and can be bought over the counter from the Treasurer at 16% (A.R.S. § 42-18122), any business day, first come first served.
The three-year clock
The lien holder may begin a judicial foreclosure action no sooner than three years after the sale date (A.R.S. § 42-18201). Until then, and until a judgment is entered, the owner can redeem by paying the Treasurer the delinquent taxes, the interest at the bid rate, and the fees (A.R.S. § 42-18151 et seq.). The lien holder must also keep buying the subsequent years' taxes ("subtaxing") to keep the lien ahead of newer liens. If the lien holder does nothing for ten years, the certificate expires (A.R.S. § 42-18127).
Before filing, the lien holder must send a notice of intent to foreclose to the owner at least thirty days ahead (A.R.S. § 42-18202). In practice, most owners who are going to redeem do so when that letter arrives.
Why the OTC list is vacant land
In Cochise County, the Treasurer's lien layer in late 2026 held about 11,150 parcels, and 10,975 of them, 98%, were vacant land. The median lien was under $700. This is not unusual. The parcels that reach the over-the-counter list are the ones no investor wanted at 16%, which means lots in 1960s and 70s subdivisions with no legal access, no utilities, inside a flood zone, or too small to ever get a septic permit. A lien that pays 16% on $600 is $96 a year; a foreclosure that costs $3,000 in legal fees to take a lot worth $2,000 is a loss.
That does not mean the list is worthless. It means the work is in the filtering: which of those parcels touch a maintained road, are outside the floodplain, are zoned for a dwelling and are big enough for a septic system. Those are exactly the joins in the Land Owner Pack, and the reason we built it.
What a lien buyer should check first
| Check | Where | Why it matters |
|---|---|---|
| Zoning district and minimum lot size | County zoning layer / planning department | A lot below the district minimum may be unbuildable without a variance. |
| Legal access | Recorder (easements), county road layer | Adjacency to a mapped road is not a right to use it. See our legal access guide. |
| FEMA flood zone | FEMA NFHL / county floodplain office | Building in a Special Flood Hazard Area needs a floodplain use permit and elevation. |
| Septic feasibility | Lot size, soils (NRCS), county environmental health | Arizona's R18-9 rules set setback and area minimums a tiny lot cannot meet. |
| Other liens on the parcel | Treasurer parcel page | Earlier CPs held by someone else take priority unless you buy them too. |
This is a description of how the statutes work, not legal or investment advice. The Arizona statutes are at azleg.gov under Title 42, Chapter 18; each county Treasurer publishes its own sale rules and fee schedule.
FAQ
- Can I buy the land itself at the Arizona tax sale?
- Not at the February sale, which sells liens. Parcels whose liens were held by the state and never redeemed are sold outright at Board of Supervisors tax deed sales (A.R.S. § 42-18301 et seq.), which are separate, less frequent, and announced by each county.
- What interest rate do over-the-counter liens pay in Arizona?
- Liens assigned from the state over the counter carry the statutory 16% rate (A.R.S. § 42-18122), simple interest, accruing monthly from the date of purchase.
Published 2026-10-26. General information about Arizona public records and statutes; not legal, title, survey or engineering advice. Statutes change — check azleg.gov and the county before acting.