Pima County tax lien sales investing guide. 16% per annum interest, 36-month redemption. Auction details and due diligence checklist.
Pima County, AZ sells tax lien certificates via ArizonaTaxSale (RealAuction), with a 36 months redemption window and a 16% per annum statutory rate. Auctions run on an annual – february cadence.
Tucson metro. Feb 2026 auction complete. OTC: State-Owned Certificates available year-round at 16% (447 sold in 2023). Sheriff civil sales ongoing monthly.
Aggregated from live Pima County listings on LienScout Pro. Snapshot refreshes weekly.
Tax-sale data on this page is sourced from and reconciled against County Treasurer's Office publications for Pima County, Arizona.
Pima County's annual tax lien auction runs in February through the ArizonaTaxSale (RealAuction) platform, covering the Tucson metro and the surrounding southern Arizona parcels. The February sale is competitive — rate bid-down is aggressive on the higher-value Tucson liens — but the more interesting mechanic for out-of-state investors is Pima's year-round State-Owned Certificate program: liens that go unsold at auction transfer to the state and are then available for direct purchase from Pima at the full 16% rate. In 2023 alone, roughly 447 state-owned certificates were sold in Pima through that channel.
Sheriff civil sales run on a separate monthly cadence for the deed side of Pima's inventory. Because Pima's land mix ranges from central Tucson infill to large rural desert parcels near Ajo and the Tohono O'odham boundary, generic bid models tend to misprice both ends of the distribution — the small vacant desert lots redeem far less often than Tucson SFR, and holding-cost math is completely different. Use the state-owned certificate list for consistent 16% deployment and reserve the February auction for parcels you've underwritten individually.
Arizona tax lien sales in Pima County run online through the ArizonaTaxSale (RealAuction) portal every February. Bidders pre-register with a refundable deposit, then submit bids as an interest-rate percentage — the lien awards to the lowest bid, with 16% as the statutory ceiling and 0% as the floor. When multiple bidders submit the same rate, the platform breaks ties by random rotation, so identical low bids are common on institutional-grade parcels. Certificates that receive no bid are struck to the state and become available over-the-counter (OTC) from March through December at the statutory 16% rate, which is where many smaller investors find their first fill in Pima County. Payment is due immediately after the sale via ACH pull from the deposit account; missed payments forfeit the deposit and bar the bidder from future sales.
Before you bid on a Pima County parcel, pull five records in this order: (1) the Treasurer's parcel detail page for tax balance and prior-year certificate holders, (2) the Assessor's parcel viewer for legal description, land + improvement value, and use code, (3) the Recorder's document search for the last recorded deed, mortgage, and any lis pendens, (4) the county GIS for setbacks, easements, and flood overlays, and (5) Google Street View for a visual read on the improvement (or the lack of one). Arizona counties publish all five online with no login. Skip parcels missing an assessor use code or improvement value — they're usually right-of-way slivers, common area, or already redeemed and stuck in the queue.
When you win a lien on a Pima County parcel, the Treasurer emails the certificate within 5–10 business days and lists it in your online account. You then have three obligations: (1) pay the subsequent-year taxes by June each year to protect your priority (subs earn the same statutory rate), (2) monitor the parcel for owner redemption — Arizona requires a 3-year statutory wait before you can start foreclosure, and (3) at year 3, file a Judicial Foreclosure of Right to Redeem in Superior Court. Most Arizona liens redeem in years 1–2 at 16% simple interest; the small percentage that don't typically foreclose cleanly because Arizona strips subordinate liens at deed issuance (federal tax liens and IRS notice-of-lien exceptions aside).
Pima County runs Arizona's second-largest tax lien certificate sale — an online bid-down-interest auction held each February via ArizonaTaxSale (RealAuction). Competition is meaningfully lighter than Maricopa: prime Tucson / Oro Valley / Marana residential parcels typically clear at 2–5% against the 16% ceiling, and mid-tier Tucson lots regularly land at 6–10%. Higher yields are realistic on outlying desert parcels, rural inholdings near Ajo / Arivaca, and small unimproved lots that institutional buyers skip. Certificates carry a 3-year redemption before you can begin foreclosure.
Tax Lien auctions in Pima County operate on a competitive bidding process where investors bid on the interest rate for tax liens. The lowest interest rate doesn't win; instead, the auction starts at the maximum penalty rate and investors bid the rate down. The winning bid is the lowest rate that is still at or above the legally mandated minimum.
Investors can expect a maximum annual return of 16% on their investment, as dictated by Arizona state law for tax liens in Pima County. This rate applies to the amount paid for the tax lien, including all taxes, interest, and fees. The actual return depends on when the property owner redeems the lien.
The primary risks include the property owner redeeming the lien before the tax sale, meaning you receive your investment back with interest, but don't gain ownership. Another risk is property liens not being redeemed within the 36-month period, potentially requiring a foreclosure process that can be complex and costly. There's also the risk of an invalid tax sale, though this is rare.
To get started, you'll need to register with Pima County for the tax lien sale. Research available tax liens, visit the County Treasurer's website for sale information, and understand the auction process and redemption periods. Be prepared to fund your investment and understand the potential need for legal counsel if foreclosure becomes necessary.