Arizona

What Arizona actually sells

Arizona counties sell tax lien certificates, called certificates of purchase. You pay the delinquent taxes, interest, penalties and charges, and in return you hold a lien against the parcel. You do not own anything on the day of the sale.

Delinquent taxes bear interest from the time of delinquency at 16% per year, simple (§ 42-18053, A.R.S.). Simple is the word that matters: unlike a penalty state, nothing compounds, so a long hold at a low bid is a slow, flat return.

The bidding: lowest rate wins

The lien is awarded to whoever pays the whole amount due and offers to accept the lowest rate of interest (§ 42-18114). Same shape as Florida: bidders undercut each other downwards from the ceiling, and the ceiling is the rate in § 42-18053.

One detail in that section decides a chunk of your yield: the lien bears interest at the bid rate from the first day of the month following the purchase. Not from the sale date. Buy near the end of a month and you have given away almost a month of interest before the clock starts.

In the big Maricopa and Pima auctions the competitive parcels clear far below 16%. A 16% award in Arizona usually means nobody else wanted that parcel.

The three-year wall

This is the part that catches people who come from a two-year state. You cannot begin to foreclose until three years after the sale (§ 42-18201(A)). Until then your only outcome is redemption: the owner pays and you collect interest.

So an Arizona certificate is a bond with an unknown maturity, not a route to a house. If your plan depends on taking the property, three years is the minimum wait before the process even starts, and the owner can redeem at any point during it.

The ten-year deadline nobody mentions

The same subsection sets the other end: the action may be brought beginning three years after the sale but not later than ten years after the last day of the month in which the lien was acquired (§ 42-18201(A)).

That is a window, not an open door. Between year three and year ten you can act; after year ten the right to bring the action is gone. A certificate parked in a drawer through a move, a change of accountant or a busy decade is a certificate that stops being worth anything — and it fails silently, with no notice from the county.

If you hold Arizona liens, both dates belong in a calendar the day you buy: the one that opens and the one that closes.

Subsequent taxes: the part that decides your real return

If the owner does not pay next year's taxes either, you can pay them yourself and roll them into the lien you already hold. § 42-18121 lets a certificate holder pay subsequent taxes, accrued interest and fees, and the treasurer records the payment on the certificate and on the record of tax lien sales.

The rate is the part that matters: those subsequent taxes bear interest at the rate stated in your certificate, from the first day of the month following that payment. So a certificate won at a good rate is not a one-off — it is a standing option to keep lending the same owner more money at the rate you already locked in.

That cuts both ways. It is the main reason Arizona bidders accept low rates on strong parcels: they are buying the option, not the first year. And it is also how a bad parcel quietly consumes several years of capital while you wait out the three-year wall. Each payment costs a $5 fee on top.

Practically: if you intend to keep a lien alive to foreclosure, subsequent taxes are not optional. If you skip them, somebody else can buy that year's lien and you end up sharing the parcel with another lienholder.

The liens nobody buys

When there is no bidder, the county treasurer assigns the lien to the state for the amount of the taxes, interest, penalties and charges (§ 42-18113), and redemption interest is the rate in § 42-18053.

These state-held liens can generally be bought over the counter afterwards, and they are the realistic route to the full 16% in Arizona. They are also, by definition, the parcels an entire auction room passed on: strips of desert with no access, land with no legal frontage, parcels whose back taxes exceed what they are worth. The rate is high because the asset is the problem.

Where the lists are published

Each of Arizona's 15 counties runs its own sale through the county treasurer, and the calendar centres on February. Maricopa and Pima, which are most of the state's population, run theirs online.

Take the parcel list from the county treasurer's own site or its named auction platform, and check it again the morning of the sale — parcels are pulled right up to the last minute when owners pay.

Six ways people lose money here

1. 1. Buying at the end of the month

   Interest runs from the first day of the month following the purchase (§ 42-18114). A purchase on the 28th donates most of a month at your bid rate.

2. 2. Planning on the property

   You cannot even file to foreclose until three years have passed (§ 42-18201(A)), and the owner can redeem throughout. Arizona pays interest; it rarely hands over houses.

3. 3. Missing the ten-year end of the window

   § 42-18201(A) closes the door ten years after the last day of the month the lien was acquired. Nobody reminds you.

4. 4. Treating 16% as compounding

   § 42-18053 says simple interest. Modelling it as compound overstates a multi-year hold badly.

5. 5. Skipping the subsequent taxes

   § 42-18121 lets you roll next year's taxes into your lien at your certificate's rate. Skip it and somebody else buys that year's lien on the same parcel, and now you share it.

6. 6. Chasing the state-held 16%

   They are at the ceiling because an entire auction declined them (§ 42-18113). Underwrite the parcel, especially legal access, before the rate.