Arizona property tax late penalties and interest

4 sourced points for Arizona, each linked to the official page it comes from.

Late taxes bear simple interest of 16 percent a year from the time they become delinquent until paid. Part of a month counts as a whole month. azleg.govOct 21
No interest is charged if the delinquency comes from an error by the county assessor or county treasurer. azleg.govOct 21
If taxes stay unpaid, the county treasurer sells tax liens on the property at the tax lien sale, held in February. azleg.govOct 21
If the lien isn't redeemed, the buyer can sue in superior court to foreclose your right to redeem, starting three years after the tax lien sale. azleg.govOct 21

The dates

Date and source	Deadline	Applies to
May 1 every yearazleg.govOct 21	Last day without penalty Pay the second half by 5 p.m.	All 15 Arizona counties
November 1 every yearazleg.govOct 21	Last day without penalty Pay the first half by 5 p.m.	All 15 Arizona counties
December 31 every yearazleg.govOct 21	Last day without penalty Bills of $100 or less: pay by 5 p.m.	All 15 Arizona counties