Arizona Tax Lien Sales: How Maricopa and Pima County Auctions Work and How to Research Every Lien (2026)

If you search for a tax lien sale Arizona investors can actually work, you hit the same wall every time: one state law, fifteen county treasurers, and a different auction platform, registration window and sale date for each. Maricopa runs its sale one way, Pima another, and Gila County still holds its sale in a courthouse. The details sit on county pages that go dark between sales, in PDFs that change yearly, and in newspaper notices you were supposed to catch in January.

That fragmentation is the real cost of Arizona. The statute is compact: liens are sold once a year, in February, to the bidder who accepts the lowest interest rate, starting from a 16% ceiling. What eats your time is everything around it: which parcels are listed, whether the owner is in bankruptcy, who else holds a lien, when registration closes, and what happens in year three if nobody redeems.

This guide is the statewide playbook. It covers how the annual sale runs, how bid-down bidding works, how the Maricopa and Pima auctions differ, over-the-counter liens, redemption and foreclosure under Title 42 of the Arizona Revised Statutes (ARS), and a research workflow that tracks every sale date across counties. Every county detail is dated as of November 2026. To run that workflow in software instead of spreadsheets, tax lien research and opportunity tracking in MarketplacePro are built for it.

What Is an Arizona Tax Lien Sale?

An Arizona tax lien sale is an annual public auction, held by each county treasurer in February, where the county sells the lien for unpaid real property taxes to the investor who accepts the lowest interest rate. You are not buying the property. You pay the delinquent taxes, interest, penalties and charges, and receive a certificate of purchase that earns interest at your winning bid rate until the owner redeems. The process starts at ARS 42-18101.

The format is a bid-down auction: bidding starts at the statutory ceiling and moves downward, so the winner is whoever accepts the least yield. You do not outbid anyone with more money. You win by accepting less on the right parcel, which is why parcel selection matters more than speed. New to the instrument? Start with our guide to the tax lien certificate.

Arizona is a lien state with a deed side, covered below. If you are still choosing between models, tax lien vs tax deed explains the trade-offs, and tax lien states vs tax deed states shows where Arizona sits.

Arizona Tax Lien Sale at a Glance

How the Annual Arizona Tax Lien Sale Runs

The sale is the visible end of a year-long process. By the time a parcel reaches a bid list, the county has already notified the owner, published the list and added penalties. That sequence tells you how old a delinquency is and what the owner could still do before the auction.

1. Taxes Become Delinquent

Taxes are due in two halves. The first half is due October 1 and delinquent after 5:00 p.m. on November 1; the second is due March 1 and delinquent after 5:00 p.m. on May 1. Bills of $100 or less are due October 1 and delinquent after December 31 (ARS 42-18052). Delinquent taxes bear 16% simple interest, and a fraction of a month counts as a whole month (ARS 42-18053). That interest becomes part of your purchase amount.

2. Notices and the Delinquent List

The treasurer must mail delinquency notices by September 1 (ARS 42-18103). Maricopa's treasurer calendar shows final delinquent notices for unpaid 2025 taxes going out December 1, 2026, and advertising fees attaching January 1 (Maricopa County Treasurer calendar). On or before December 31, the treasurer prepares the list of real property with unpaid prior-year taxes and a notice that each lien will be sold at public auction (ARS 42-18106). A penalty of $5 or 5% of the delinquent taxes, whichever is more, is added to each listed parcel on January 1 (ARS 42-18107).

The notice is mailed to the owner, posted at the treasurer's office, and published in a newspaper at least two weeks but not more than three weeks before the sale starts (ARS 42-18109). Pima's booklet explains the year pattern: tax year 2024 liens were offered in February 2026, and 2023 liens in February 2025. So the liens in a February 2027 sale come from unpaid 2025 taxes.

3. The Sale Is Held in February

The sale continues day to day, excluding Sundays and holidays, until every lien has been offered (ARS 42-18112). In practice, large counties run a single online day with liens split into batches that close at fixed intervals. Pima's 2026 sale was one day, with batches closing from 8:00 a.m. to 12:00 p.m. MST and an auxiliary session from 1:00 to 3:00 p.m. for parcels that did not sell.

4. You Pay and Receive a Certificate

You pay the purchase price in cash within 15 days after the close of the sale. If you fail to pay, the treasurer can resell the lien before close or, after close, recover the amount through a civil action or bar you from buying liens in any Arizona county for up to a year (ARS 42-18116). You then receive a certificate of purchase, or a registered certificate in the treasurer's records, describing the property, tax years, amount paid and the rate payable on redemption (ARS 42-18118). Certificates are assignable once the treasurer notes the assignment.

5. Unsold Liens Go to the State

If a lien gets no bid, the treasurer re-offers it the next day. When no more sales can be made, remaining liens are assigned to the state for the amount of the taxes, interest, penalties and charges (ARS 42-18113). Those are the liens investors later buy over the counter, covered below.

Bid-Down Bidding: How You Win an Arizona Lien

You bid a rate, not a price. The county fixes the purchase amount: the taxes, interest, penalties and charges on the list. Everyone competes only on the rate they will accept, and the lowest rate wins (ARS 42-18114).

Pima's 2026 rules show the mechanics. Bidding starts at 16% in 1% increments, and a 0% bid is acceptable. If you win at 9%, your lien earns 9% from the first day of the month after purchase, and any subsequent taxes you pay later earn the same 9%.

What a 0% Bid Means

A 0% bid is allowed, and it is the most important thing to understand about the auction. On a parcel everyone wants, competition pushes the rate toward zero, and you would be tying up capital in a lien that earns little unless the property goes to foreclosure. That is a bet on a deed, not a yield decision, and as the foreclosure section shows, a deed is not guaranteed. Rates vary by county and year: Cochise County's bidder application shows average winning rates of 7.94% for 2024, 7.99% for 2025 and 7.36% for 2026, a snapshot of one county rather than a forecast for yours.

Rules That Change Who Can Bid and What It Costs

County rules sit on top of the statute. Pima applies a Single Simultaneous Bidding Entity Rule: each entity registers once and may not have a legal or financial relationship with another registered bidder. Pinal requires an initial deposit by wire or ACH through RealAuction one day before the sale, and takes no deposits at the treasurer's office. Fees are on top of the purchase amount. Pima charges a county processing fee of $1 under $50, $5 under $200 and $10 at $200 or more, a $10 certificate fee, and a platform fee per delinquent year of $0 under $50, $5 from $50 to $200 and $10 above $200. Gila charges a $10 administration fee and a $30 recording fee per lien. On small liens, non-refundable fees matter. Confirm current rules on each county's auction site before you plan capital.

Maricopa County Tax Lien Sale: 2026 Results and the Next Cycle

The Maricopa County tax lien sale is the largest in the state and the one most investors start with. The treasurer runs it online through RealAuction at maricopa.arizonataxsale.com, and the 2026 sale took place in February 2026.

How Maricopa Registration Works

The Treasurer's Tax Lien Web page lays out four steps: sign up on RealAuction and receive a bidder number (it can take 24 to 48 hours to reach the Treasurer's Office), create a Tax Lien Web account with the Treasurer, click the email verification link, then log in with your bidder number and a code sent to your RealAuction email. RealAuction handles registration questions and the Treasurer handles everything else (Maricopa County Treasurer, Tax Lien Web). Register the week before the auction, not the morning of.

The 2027 Maricopa County Tax Lien Sale: What We Could Verify

As of November 6, 2026, the Maricopa auction site is offline between sales, and the Treasurer's calendar lists the December 1 delinquency notices and January 1 advertising fees but no 2027 sale date. Under ARS 42-18112 the sale must be held in February. The exact day, deposit and registration deadlines should appear on the RealAuction bidding rules page when the county reopens the site. Treat any specific date you read before then as unconfirmed.

Partial Payments Change the Maricopa Math

In a county with a population over three million, which in practice means Maricopa, the treasurer must accept a partial payment of at least 25% of the principal on the oldest year of the delinquency for certificates sold since 2016 (ARS 42-18056). Those payments are impounded and released to the lien holder only when enough has accumulated to fully redeem the oldest certificate, and a partially redeemed lien must still be fully redeemed before any deed (ARS 42-18152). In that county the treasurer also issues a separate certificate for each later year's taxes you pay (ARS 42-18121), so each year can have its own foreclosure clock. Track certificates, not parcels.

For inventory, Maricopa publishes an Overdue Property Taxes Viewer that maps lien and delinquent parcels. It shows geography, not equity, mortgage position or MLS status. Those come from the research step below.

Pima County Tax Lien Sale: Rules From the Treasurer's Booklet

Pima County, which includes Tucson, publishes the most detailed investor booklet of any Arizona treasurer and is candid about risk: it calls the sale "the ultimate in buyer beware."

Source: Pima County Treasurer, 2026 Tax Lien Sale, as of November 2026. The page still described the 2026 sale, so the 2027 schedule had not been posted.

Read Pima's Warnings as a Research Checklist

The booklet tells you to verify legal descriptions, because errors can complicate title insurance at foreclosure. It tells you to research a parcel's genealogy, meaning its history of splits and re-platting, because a split parcel may carry earlier, superior tax liens and the same property can have different parcel numbers in different years. It warns that special assessments or other liens may be unknown to the Treasurer, that bankruptcy can delay or reduce what you receive, and that you cannot foreclose while a bankruptcy stay is in effect. And it tells you to decide, before bidding, whether you would want the property if you ended up with a deed. Our tax lien due diligence checklist turns those warnings into verifiable items.

Arizona Tax Lien Sale Platforms and Dates by County

Each treasurer chooses its own format. This table shows what we could verify from official county pages as of November 2026; where we could not, we say so.

Sources: Pima, Maricopa, Pinal, Yavapai, Navajo, Coconino, Gila, Cochise and Mohave. Platforms and dates change; confirm each with the treasurer before you register.

Gila shows how different a small county can be. It lists roughly 500 parcels and expects to offer about 400, the sale takes about three hours, and the treasurer reminds bidders that you are a "silent lien holder": you do not own the parcel, may not contact the owner or enter the property, and everything runs through the treasurer's office.

Fifteen sales in one month create a scheduling problem first. Registration at one county can close before another county's sale day, and a deposit wired the day before a Pinal sale is a different task than an ACH link in Pima. Filtering by auction date and county in one place shows which sales overlap and which registration windows close first. See our guide to tax sale property search tools.

Over-the-Counter Arizona Tax Liens

Over-the-counter (OTC) liens are the second way into Arizona liens, and they are easy to miss because there is no auction day. When a lien gets no bid in February, the treasurer assigns it to the state, then must sell and assign the certificate to any person who pays the whole amount due, including interest, penalties and charges, plus the entire amount of subsequent taxes. The assignment fee is not more than $10 (ARS 42-18122). Interest on redemption for these state-assigned liens follows ARS 42-18053 rather than a bid-down rate (ARS 42-18113).

Counties run OTC differently. Pima sells "new assignments" online through RealAuction from April 1 through December 15 and none in January through March. Pinal makes county-held certificates available online from about the first week of March through December. Coconino says leftover liens are available over the counter from March through December.

Subsequent Taxes

Once you hold a certificate, you can pay later years' taxes on the same parcel starting June 1. They earn the rate on your certificate from the first day of the month after you buy them, for a $5 fee (ARS 42-18121), and the treasurer may require a buyer of a subsequent certificate to take assignment of all outstanding certificates (ARS 42-18121.01). Pima accepts sub-tax requests June 1 through December 15; Pinal says December 31 is the last day. Miss the window and the taxes are offered at the next sale as a separate certificate, possibly to someone else.

Research OTC liens harder, not less. A lien that reaches OTC did not attract a bid from investors who had done their homework. Look for vacant land with no practical use, access problems, tiny split-off slivers and bankruptcies. Our guide to researching tax liens online walks through that screen.

Redemption: How Most Arizona Liens End

Redemption means the owner, or someone with an interest in the property, pays off the lien. You receive your purchase amount back with interest at your certificate rate, and the lien is gone. A lien may be fully redeemed within three years after the sale, and after that at any time until a treasurer's deed is delivered (ARS 42-18152). There is no calendar date by which the owner must act, only the three-year earliest foreclosure date and the ten-year expiration.

More people can redeem than new investors expect. ARS 42-18151 lists the owner, anyone paying on the owner's behalf as a charitable gift, the owner's agent, assignee or attorney, and any person with a legal or equitable claim, including a holder of a certificate of a different date. To redeem, the person pays the treasurer the amount the lien was sold for, your later tax payments, and your statutory fees except the processing fee, each with interest at the certificate rate (ARS 42-18153). The processing fee is therefore a cost you do not recover. Interest accrues by the month, with any part of a month counting as a full month, per Pima's booklet.

Redemption interest is income. The IRS says interest received is generally taxable in the year it becomes available, and Pinal notes it mails 1099s to bidders for prior-year certificate interest (IRS Topic no. 403). Ask a tax professional how it applies.

Redemption can arrive late. Anyone entitled to redeem may do so before judgment, but if they redeem after a notice of the foreclosure action is recorded, the court must award the plaintiff costs, including title report costs and reasonable attorney fees (ARS 42-18206).

Foreclosure: The Path From Certificate to Treasurer's Deed

If no one redeems, the certificate holder can bring a judicial action to foreclose the right to redeem. This is where the lien investor's role stops being passive, and it is also where Arizona law changed most recently.

Timing and Notice

An action may be brought beginning three years after the sale and not later than ten years after the last day of the month the lien was acquired, in the superior court of the county where the property sits, naming the county treasurer as a party (ARS 42-18201). When the ten years pass, the certificate expires and the lien is void, so a certificate you stop tracking can quietly become worthless.

Before filing, you must send a notice of intent by certified mail at least 30 and not more than 180 days before the action. It goes to the owner of record (or to the assessor's mailing address, the situs address and the tax-bill address) and to the treasurer, and must tell the owner to request an excess proceeds sale if they believe the property is worth more than the tax burden. Without the notice, the court may not enter judgment (ARS 42-18202). Ordinary civil procedure applies, including appeal rights (ARS 42-18203).

The Excess Proceeds Sale Changes the Outcome

Under ARS 42-18204, the owner or the certificate holder can ask the court to decide whether a sale of the property to recover excess proceeds is reasonable. It is reasonable if the sale price is likely to be more than $2,500 above the lien holder's amounts: foreclosure costs and attorney fees, the lien purchase price plus 16% per year, statutory fees plus 16% per year, other recorded liens, and the estimated cost of sale.

If the court finds a sale reasonable, it forecloses the right to redeem but orders the property sold instead of deeded to you, and the owner keeps their interest in the excess. If the request is unreasonable or never made, the court orders the treasurer to deliver a deed. This owner-protection mechanism was enacted in 2024, and the statute carries a 2026 amendment note effective until October 1, 2028, so have an Arizona attorney confirm the rules when you act.

For research, the lesson is simple: on a parcel with significant equity, do not model a deed. Model recovery of your purchase amount, 16% on it, your fees and your costs. A deed is the realistic outcome mainly where the property's value is not far above what is owed.

The Deed and What It Does Not Clear

With a certified judgment and a $50 per parcel fee, the treasurer delivers a deed to the party who won judgment (ARS 42-18205). Foreclosure does not extinguish easements or certain assessment liens, and neither does the lien sale itself (ARS 42-18115). A deed does not clear a position you did not check, so confirm recorded liens and assessments before you bid. Pima also warns that owning six or more lots in a subdivision may make you a "subdivider" who should contact the Arizona Department of Real Estate.

Arizona Tax Deed Sales: Where Deed Auctions Fit

When investors search for a tax deed sale Arizona runs, they usually mean one of two things. The first is the treasurer's deed that follows a lien foreclosure, which is not an auction. The second is the county sale of parcels already deeded to the State of Arizona because the lien was never redeemed or purchased. That second path is the Arizona tax deed sale in the usual sense.

By the first Monday in November each year, the county board of supervisors lists real property held by the state under tax deed (ARS 42-18301) and advertises it for two to three weeks before the sale (ARS 42-18302). It may sell to the highest bidder for cash, by live auction or online, deliver a deed at the purchaser's cost, and send any balance after taxes and costs to the dispossessed owner. Unsold parcels may be sold over the counter (ARS 42-18303).

Practice varies. Mohave County held its 2026 sale online March 2 through 6 on Public Surplus, offering more than 800 properties, all as-is. Yavapai runs an annual online auction on Public Surplus and then offers no-bid parcels over the counter (Yavapai Tax Deed Sales). Maricopa conducts tax deeded land sales on an as-needed basis as agent for the state, and Pima publishes a list of parcels with treasurer's deeds. We did not find posted 2027 deed-sale dates for these counties.

Deed parcels carry a different risk profile: you buy title, so you inherit access, zoning, utilities, boundary and title problems. Mohave urges bidders to confirm zoning first. Our tax deed software guide covers evaluating these deals faster, and tax deed research in MarketplacePro puts the same property intelligence on deed-side records. To see how pure deed states differ, compare Georgia tax deed sales, the Harris County tax deed auction and the Michigan tax deed sale process.

The Research Workflow: Track Every Lien and Every Sale Date

The gap between investors who stay organized in Arizona and those who miss registration windows is workflow, not insight. Run it by hand and you juggle county sites, spreadsheets and a calendar you maintain yourself. Run it in MarketplacePro and search, property data, bid lists and deadlines sit in one workspace, which is how research drops from three-plus hours per property to a single focused session.

1. Build the Statewide Calendar First

Anchor the calendar to statutory dates, then layer on each county's registration, deposit, sale and payment dates with a source link for each.

Load the verified dates into opportunity tracking so registration cutoffs, deposits, sub-tax windows and foreclosure dates stay visible across every county. That is where fewer missed opportunities comes from: a deadline you can see is a deadline you act on.

2. Pull the Delinquent List and Narrow It

Get the county list, the Maricopa viewer for geography and the newspaper listing, then narrow by your buy box: county, years delinquent, purchase amount, property type. Our guide to finding tax delinquent properties covers seven data sources. In MarketplacePro, tax lien research filters by auction date, size, distress and county, so the shortlist is a filter result, not a pass through a PDF.

3. Underwrite the Property, Not the Rate

For each shortlisted parcel, pull ownership, assessed and market value, tax history, mortgage and lien data, MLS status and distress signals. This step decides whether the parcel deserves a bid at all. A high-equity parcel may end in redemption or an excess proceeds sale; a parcel with a large senior lien or no practical use may not be worth even a 0% bid. Deal analysis scores each opportunity on distress, economics and complexity so a long list becomes a ranked one. For tooling options, see tax lien data providers compared.

4. Check the Risks the Counties Warn About

Treat Pima's warnings as a checklist for every county: confirm the legal description, trace the parcel's genealogy, look for assessments, easements and other liens, check for bankruptcy, and confirm owner, mailing and situs addresses you would need for the 30-to-180-day foreclosure notice. Remember that reneging on a winning bid can bar you from every Arizona county for up to a year.

5. Set Your Floor Rate Before the Auction

Because Arizona is bid-down, decide your minimum acceptable rate per parcel before the batch opens. Tie it to the three-year earliest foreclosure date, the odds of an excess proceeds sale, unrecovered fees and how long your capital could be locked up. A floor set at your desk is a number; a floor set while a batch closes in twenty minutes is a guess.

6. Build the Bid List and Register Early

Export a bid list of parcels that pass, sorted by batch and sequence number, and check it against the county list on sale day. MarketplacePro's auction calendar and instant bid lists are built for this. Handle paperwork a week out: bidder number, tax forms, deposits, an ACH-ready bank account and, in Maricopa, your Tax Lien Web account. Our tax lien investing app guide covers doing the research from your phone.

7. Track Every Certificate After You Win

Record certificate number, parcel, tax year, rate, purchase date, sub-tax windows, earliest foreclosure date and expiration date, and review the list on a fixed cadence. Weighing software costs? Our tax lien software cost breakdown compares options as of 2026.

Risks to Plan For

Arizona's process is orderly, but most risks are research failures. Pima's Treasurer states that the office does not guarantee a purchaser will make money and that the owner may redeem at any time, so your capital is committed for an unknown period. Easements and some assessment liens survive both sale and foreclosure. Missed calendars cost you the sale, not just a fee. And a process that works in Phoenix will not transfer cleanly to a courthouse sale in Globe, so read each county's rules every year. Tax lien investing involves risk, including the potential loss of principal.

Frequently Asked Questions

When is the Arizona tax lien sale held?

Arizona tax lien sales are held in February each year under ARS 42-18112, and each county treasurer picks the day. The 2026 sales included Yavapai on February 10, Navajo on February 11, Gila on February 18 and Pima on February 26, and Yavapai lists its next auction as February 9, 2027. Maricopa and Pima had not posted 2027 dates when we checked in November 2026, so confirm with each treasurer and the RealAuction bidding rules page once the site reopens.

How does bid-down bidding work in Arizona?

In bid-down bidding you bid the interest rate you will accept, not the price. The county sets the purchase amount, which is the delinquent taxes, interest, penalties and charges. Bidding starts at 16% and moves down in 1% steps, 0% is allowed, and the lowest rate wins the certificate. Your lien then earns that rate from the first day of the month after purchase until it is redeemed or foreclosed.

How does the Maricopa County tax lien sale work?

The Maricopa County tax lien sale is an online auction run by the county treasurer through RealAuction in February. You register on RealAuction for a bidder number, create a Tax Lien Web account with the Treasurer, and fund your deposit under the sale's bidding rules. The 2026 sale took place in February 2026; the 2027 date will appear on the RealAuction bidding rules page when the site reopens. Bidder numbers can take 24 to 48 hours to reach the Treasurer, so register early.

What is the maximum bid rate in an Arizona lien sale?

The ceiling is 16% per year, simple. ARS 42-18114 says the winning bid may not exceed the rate computed under ARS 42-18053, and that statute sets the rate at 16% per year. Pima confirms bidding starts at 16%. The rate you earn is the rate you win at, anywhere from 16% down to 0%.

How long do owners have to redeem an Arizona tax lien?

There is no fixed deadline short of a deed. A lien can be redeemed within three years of the sale and, after that, any time before the treasurer's deed is delivered. Anyone with a legal or equitable interest can redeem, including a charitable payer. You may start foreclosure three years after the sale, and the certificate expires if no action is brought within ten years after the month the lien was acquired.

Can I get the property by buying an Arizona tax lien?

You can, but it is not the default outcome. Most liens are redeemed and you are paid with interest. If not, you may file a judicial foreclosure no earlier than three years after the sale, after certified-mail notice 30 to 180 days before filing. Since 2024 an owner can request an excess proceeds sale, which the court orders if the property is likely to sell for more than $2,500 above the lien holder's amounts; the property is then sold and the owner keeps the surplus. Use an Arizona attorney for any foreclosure.

Is there a tax deed sale in Arizona?

Yes. Counties sell parcels held by the State of Arizona under tax deed, in addition to selling liens. The board of supervisors lists the parcels by the first Monday in November, advertises them, and sells to the highest bidder for cash, live or online. Mohave held an online sale of more than 800 properties on March 2 to 6, 2026, Yavapai runs an annual online auction followed by over-the-counter sales, and Maricopa sells on an as-needed basis. Properties are sold as-is.

Can I buy Arizona tax liens over the counter?

Yes, in many counties. Liens with no bid at the February sale are assigned to the state, and the treasurer sells them to anyone who pays the full amount due plus subsequent taxes, with an assignment fee of not more than $10. Pima sells new assignments online from April 1 through December 15, Pinal offers county-held certificates from about early March through December, and Coconino sells leftover liens from March through December.

Do I have to attend the sale in person?

Usually not. Maricopa, Pima, Pinal, Yavapai, Navajo and Coconino run their sales online. Gila County is the exception we verified: its sale is held in person at the courthouse in Globe, with payment in cash or cashier's check. Even for online sales, plan registration, tax forms, deposits and an ACH-ready bank account well ahead of the sale date.

How do I track sale dates across Arizona counties?

Build one calendar anchored to the statutory dates, add each county's registration, deposit, sale and payment dates from its treasurer page with a source link, and re-verify every January when auction sites reopen. MarketplacePro's auction calendar and opportunity tracking keep those dates in one workspace, filterable by county, so overlaps and deadlines are visible without opening fifteen county sites.

Your Next Steps for the 2027 Arizona Sales

The 2027 sales will be built from unpaid 2025 taxes. Pick the counties that fit your buy box, bookmark each treasurer's lien page, read last year's bidding rules, and decide how much capital you can lock up for at least three years. Then build your calendar, set up your research workflow and register early.

To see the workflow run against the Arizona counties you care about, Book a live walkthrough and we will show current lien and deed inventory with full property intelligence attached, or View Demo first. For background, start with the tax lien certificate guide.

Related reading: Tax Lien States vs Tax Deed States | Tax Lien Certificate Guide | How to Research Tax Liens Online