Arizona · Tax Lien State · 16% Max Rate

Pima County
Investing Guide

Arizona's second-largest county — home to Tucson, the University of Arizona, and 5,000–6,000 tax lien parcels annually via RealAuction. Moderate competition compared to Maricopa, with more opportunities for individual investors to win liens at meaningful rates.

16%
Max rate
5.8%
Avg winning rate
94.1%
Redemption rate
5,740
Parcels '24
3 yrs
Redemption period
Moderate
Competition
⚑ Data note Historical figures shown are illustrative estimates pending public records requests to Pima County Treasurer. Auction mechanics and contact information are verified current as of March 2026.
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Historical Performance
5-Year Auction Data

Lien volume, winning bid rates, and redemption trends from Pima County's annual tax certificate sales. Data reflects all parcels offered at the primary RealAuction auction. Illustrative

Parcels offered
5,740
2024 auction est
▲ 3.2% vs 2023
Parcels sold
5,490
95.6% sell-through est
▲ 1.9% vs 2023
Redemption rate
94.1%
5-yr avg: 92.6% est
▲ Improving
Avg lien value
$2,610
Per certificate est
▲ 8.4% vs 2023
Avg rate won
5.8%
vs 16% statutory max est
▼ Slowly compressing
Foreclosure rate
2.4%
Of all liens issued est
→ Stable
Parcels offered vs. redeemed (5-year)
Avg winning bid rate by year
Property type breakdown
Residential
52%
Vacant land
32%
Commercial
12%
Other
4%
Competition assessment
Pima attracts a mix of regional investors and some institutional participation — notably less algorithmic pressure than Maricopa. Average winning rates of 5–7% make this county genuinely accessible to individual investors who research carefully. Expect real competition on desirable Tucson metro residential parcels.
Best strategy here
Focus on Tucson residential liens in the $1,500–$5,000 range where owner-occupancy is likely and equity is strong. The state-held resale via Bid4Assets (March) remains the best entry point for first-timers — no bidding competition and full 16% rate. Vacant desert land outside Tucson city limits warrants extra caution.
Avg time to redemption
Most Pima liens redeem within 10–18 months. At 5–7%, a $2,610 lien held 12 months yields roughly $131–$183 — meaningfully better than Maricopa per certificate. The University of Arizona area provides stable demand for rental housing, supporting strong redemption rates near campus.
Auction Mechanics
How Pima County's Auction Works

Pima County holds its primary auction each February via the RealAuction online platform — the same system used by Maricopa. All bidding is conducted remotely with no in-person component.

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Auction timeline
The primary auction runs in February each year, typically over 2–3 days. Pima publishes the parcel list on the RealAuction platform approximately 3–4 weeks before bidding opens. Registration closes roughly 1 week before the auction starts. The Arizona Department of Revenue resells unsold liens through Bid4Assets in March at the full statutory 16% — no competitive bidding required.
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Bid-down interest format
Like all Arizona lien counties, Pima uses a bid-down-the-interest-rate format. Starting at 16%, investors compete by accepting progressively lower rates. The investor willing to accept the lowest rate wins the certificate. Pima's smaller institutional presence means rates frequently settle in the 4–9% range on typical residential parcels — a significant advantage over Maricopa's 1–3%.
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Registration requirements
Register at RealAuction.com and link your Pima County account. You'll need a government-issued ID, a valid entity name if bidding as an LLC, and a funding method for the deposit. Pima requires a refundable deposit — exact amount published on the county treasurer's website each December. Contact the treasurer directly at (520) 724-8341 to confirm current-year deposit tiers before registering.
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Payment and settlement
Winning bids must be paid in full within 24–72 hours of the auction closing — verify the exact deadline on the Pima County Treasurer website annually as it varies by year. Payment is processed through the RealAuction platform via wire transfer or ACH. Certificates are issued digitally after payment clears. Failure to pay forfeits your deposit.
Quick reference — Pima County auction specs
Auction formatOnline only — RealAuction.com. No in-person option.
Primary auctionFebruary each year (typically 2–3 days)
State-held resaleMarch via Bid4Assets at full 16% — no competitive bidding
Bidding formatBid-down interest rate starting at 16%
Redemption period3 years from purchase date (ARS § 42-18152)
Min guaranteed return5% of lien face value (ARS § 42-18053) — applies even if redeemed early
Registration deadlineTypically 1 week before auction opens — check RealAuction annually
Deposit requiredYes — amount varies by bid volume; refunded if not used
Payment deadline24–72 hours after winning bid — confirm annually
Payment methodWire transfer or ACH via RealAuction platform
Certificate deliveryDigital through RealAuction after payment clears
Subsequent taxesYou may pay subsequent year taxes to protect your position — adds to lien balance
Treasurer contact(520) 724-8341 · pima.gov/treasurer
Investor Notes
What to Expect in Pima County

County-specific intelligence for investors preparing to bid. Updated annually based on auction results and investor reports.

Who you're competing against
Pima's auction draws a mix of individual investors, smaller regional funds, and occasional larger entities. Unlike Maricopa, algorithmic bidding from national hedge funds is less dominant — you'll frequently compete against other human investors making real decisions per parcel. This makes thorough pre-auction research on individual parcels meaningfully valuable, not futile.

Competition is heaviest on Tucson metro SFR parcels in zip codes 85704, 85705, 85710, and 85711 — these are well-understood by local investors. South Tucson and rural Pima County parcels attract notably less competition.
Where individual investors can win
Pima offers genuine opportunity for individual investors in several pockets:

University of Arizona adjacency (zip codes 85719, 85721) — rental housing demand keeps redemption rates high. Foothills residential (Oro Valley, Marana) — higher assessed values, strong equity, motivated owners. Commercial parcels in the $3,000–$8,000 face value range see less competition from individual residential-focused investors. Bid4Assets state resale remains the cleanest entry point at full 16% with no competition.
Property mix and redemption profile
Pima's parcel mix includes more vacant desert land than Maricopa proportionally — 32% vs 27%. Desert land liens in unincorporated Pima County carry significantly higher non-redemption risk: absentee owners, no road access, no utility hook-ups, and difficult-to-liquidate collateral if foreclosure becomes necessary.

Redemption risk concentrates in far southeast and far northwest Pima County unincorporated areas. Tucson city parcels redeem at rates similar to or exceeding the county average.
University of Arizona factor
Tucson is home to roughly 49,000 University of Arizona students — a stabilizing economic force that sustains rental demand and property values across much of the central city. Properties within 1–2 miles of campus have historically shown strong redemption rates because owners (including investor-landlords) have clear financial motivation to protect income-producing assets.

Cross-reference your target parcels against UA campus proximity as an informal positive redemption signal. Verify using the Pima County Assessor's GIS map.
Due Diligence Resources
Research Links for Pima County

Every link you need for pre-auction parcel research — assessor lookup, recorder title search, auction platform registration, and more. Open all before auction day.

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Assessor · Parcel lookup & sales comps
Pima County Assessor
Search by APN, address, or owner name. Confirms assessed value, property classification, owner mailing address, and homestead exemption status — the clearest indicator of owner-occupancy available from public records. Pull nearby arm's-length sales to compare assessed value against actual market prices, which can lag by 1–2 years. Owner mailing address in a different state or country is a meaningful redemption risk factor.
assessor.pima.gov
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Recorder · Title search & mortgage lookup
Pima County Recorder
Search by APN or owner name to find recorded Deeds of Trust. Arizona uses Deeds of Trust — not traditional mortgages — so search for that document type. The Deed of Trust shows the original loan amount and origination date. If no Deed of Reconveyance is recorded (filed when the loan is paid off), the Deed of Trust is still active. Also surfaces IRS federal tax liens, HOA liens, lis pendens notices, and easements — all recorded here by law.
recorder.pima.gov
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Treasurer · Tax roll & delinquency history
Pima County Treasurer
View full tax payment history, outstanding lien amounts, and prior-year delinquencies by parcel. How many years has this owner been delinquent? Have they historically paid eventually, or are they 3+ years behind? This history is among the most predictive data points available before you bid. Also the registration portal for auction access and the annual parcel list download.
pima.gov/treasurer · (520) 724-8341
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Auction platform · Primary February sale
RealAuction
Online platform for Pima's primary February auction. Register here, access the parcel list (available 3–4 weeks before auction), set your minimum acceptable rates using the auto-bid feature, and execute purchases. If you also bid in Maricopa, note that each county requires a separate account setup within RealAuction. Complete county-specific registration steps well before the registration deadline closes.
realauction.com
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Auction platform · State-held liens at 16%
Bid4Assets — State-Held Liens
The Arizona Department of Revenue resells liens unsold at the primary auction at full 16% — no competitive bidding, no rate compression. Runs in March each year and covers all Arizona counties including Pima. Strongly recommended for individual investors new to Pima County — you get the statutory maximum rate without competing against experienced regional bidders. Volume is lower but every certificate earns full 16%. Register separately from RealAuction.
bid4assets.com/taxsale
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GIS · Parcel maps & boundaries
Pima County GIS Parcel Viewer
Interactive parcel map showing lot boundaries, road access, and surrounding land use. A landlocked parcel with no road frontage has near-zero market value — the fastest way to catch that before bidding. Critical for desert land parcels, which make up 32% of Pima liens. Use alongside Google Maps satellite view to assess structure condition, access routes, and occupancy signals remotely.
webcms.pima.gov · Assessor Parcel Viewer
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Development Services · Permit history
Pima County Development Services
Search permit history by address or APN. Recent permits (roof replacement, HVAC, addition, pool, ADU) signal an owner actively investing in the property — a strong positive redemption signal. No permits in 10+ years on an aging structure may indicate deferred maintenance or absentee ownership beyond what satellite view reveals. Review alongside code enforcement records, which are separate.
webcms.pima.gov · Development Services
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Code Enforcement · Violations & orders
Pima County Neighborhood Services — Code Enforcement
Search for active code violations, nuisance orders, and abatement orders. A property under active condemnation or demolition order is a liability — the owner cannot legally occupy it, cannot sell it cleanly, and has reduced incentive to redeem your lien. This check is free and takes under 5 minutes. Don't skip it on any parcel where structure condition is unknown from satellite view.
webcms.pima.gov · Code Enforcement
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Superior Court · Lis pendens & civil cases
Pima County Superior Court
Active lawsuits involving a property (foreclosure actions, partition suits, probate disputes, quiet title actions) are filed here. A property in active litigation can have severely clouded title — you may win the lien but face significant complications on collection or any eventual deed acquisition. Search by owner name before bidding on any parcel with unclear ownership, multiple owner names, or recent transfer history at the recorder.
sc.pima.gov
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ADEQ · Environmental contamination
Arizona Dept. of Environmental Quality
ADEQ maintains a searchable database of contaminated sites, underground storage tanks (USTs), and active remediation projects statewide. More granular than the EPA's national EnviroMapper for Arizona-specific issues. Critical for any commercial, industrial, agricultural, or former gas station parcel in Pima County — contamination liability survives tax sales and can exceed property value by orders of magnitude.
azdeq.gov · Environmental Mapper
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Federal courts · Bankruptcy & IRS liens
PACER — Federal Court Records
Search for active bankruptcy filings by property owner name. An automatic bankruptcy stay prevents your lien from being enforced while the case is active — you hold the certificate but cannot foreclose. Note: IRS federal tax liens are separately searchable at the county recorder under the owner's name as grantor. Both checks are needed for complete federal lien coverage before bidding on any parcel with financial distress signals.
pacer.gov · Nominal per-page fee
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FEMA · Flood zone designation
FEMA Flood Map Service Center
Confirm flood zone designation by address. Pima County includes significant desert wash and riparian areas — particularly along the Santa Cruz River and its tributaries — where flood zone status can dramatically suppress value. Flood zone parcels require expensive flood insurance, reduce financing eligibility, and create resale friction. High-risk zones (AE, AO) materially affect LTV and the owner's ability to sell or refinance.
msc.fema.gov
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Market data · Equity estimation & trends
Zillow / Redfin — Market Value & Trends
Use Zillow or Redfin to estimate current market value (frequently more accurate than assessed value, which can lag 1–2 years), review Zestimate trajectory over 24 months, and check median days-on-market by zip code. For equity estimation: Estimated Market Value − Estimated Remaining Loan Balance ≈ Equity. The recorder shows the original Deed of Trust amount and date — estimate remaining balance via a mortgage amortization calculator. Pima's Tucson market has seen moderate appreciation — assessed value may understate current equity.
zillow.com · redfin.com
How to estimate equity from public records

No single database tells you an owner's current equity. You build the picture from three sources:

① Estimated market value Use Zillow or Redfin as a starting point. Cross-check against recent arm's-length sales from the Pima County Assessor for the same neighborhood. Assessed value alone can lag the market by 1–2 years — especially relevant in Tucson's appreciating north side and Marana submarket.
② Estimated remaining loan balance The county recorder shows the original Deed of Trust amount and date — not the current balance. Plug those numbers into a mortgage amortization calculator to estimate how much principal remains. A $180K loan from 2014 has paid down roughly $40–50K on a 30-year fixed at typical rates.
③ Approximate equity Market Value − Estimated Remaining Balance = Approximate Equity. This is never exact, but for lien investing the rough number tells you whether the owner has real financial incentive to redeem. Add your lien amount (and any prior-year liens) to the balance side for a complete picture.
Research Tools
Tools for Pima County Research

Use these before and during the auction to evaluate parcels, score redemption probability, and track your bids.

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Pre-auction
Parcel Research Tracker
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Analysis
Lien Value & LTV Calculator
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Education
Redemption Factor Explorer
✓
Due diligence
Property Research Checklist
$
Planning
ROI Calculator
For educational purposes only. Auction dates, deposit requirements, and platform details change annually — always verify directly with the Pima County Treasurer before registering. Historical data marked "est" or "illustrative" is based on publicly available estimates pending formal public records requests. This page does not constitute legal or financial advice.