The statutory ceiling
This is the maximum. Bidders compete by bidding the rate down at the sale, so the rate you actually earn is set at the auction and is often lower. There is no statutory minimum, so a competitive bid can run the rate to zero.
No minimum rate
Arizona sets no statutory floor. A certificate bid down to a low rate, or to zero, earns only that rate, so competition can erase the yield entirely.
How interest accrues
Interest is 16 percent per year, simple, and a fraction of a month is counted as a whole month. The winning bid rate accrues from the first day of the month following the purchase of the tax lien. There is no minimum-return floor.
Why some certificates are bid to zero
Bidders compete by accepting a lower rate of interest, and the lowest rate wins the lien. Rates are bid down from the 16 percent statutory maximum. Arizona sets no minimum-return floor, so a low winning bid earns only that low rate. Investors accept very low rates mainly to secure the lien on parcels they eventually want to foreclose.
The headline figure is a ceiling, not a forecast. To see what a certificate actually pays after the rate is bid down, run the numbers in the yield calculator, and compare Arizona against other states on interest rates by state.
Arizona tax lien yield calculator and examples
Change the amounts in this calculator to compare a certificate scenario for Arizona. The table uses fictional inputs and the same calculation. It assumes redemption, excludes fees and separate overbids, and makes no return forecast.
Worked certificate scenarios
Each scenario starts with a fictional $5,000 certificate. Months mean months charged for interest. Confirm the calendar count with the county office; this tool accepts a month count and does not calculate it from dates.
| Scenario | Bid rate | Charged months | Interest | Total with principal | Annualized gross yield |
|---|---|---|---|---|---|
| Three charged months | 8% | 3 | $100.00 | $5,100.00 | 8% |
| Twelve charged months | 8% | 12 | $400.00 | $5,400.00 | 8% |
| Zero-percent bid | 0% | 3 | $0.00 | $5,000.00 | 0% |
Annualization expresses the modeled interest over a year using charged months. It does not predict repeat purchases or future redemption. The cited state rules above explain the floor and accrual method.
Compare another state in the national yield calculator, review Arizona redemption periods, or read the Arizona statutes and sources.
Verified Oct 12, 2026 against Arizona statutes.
Tax Sale Atlas publishes educational information about public tax sale processes. This is not legal, financial, or investment advice. Rules, dates, and fees change; confirm with the office that runs the sale before you bid.