Are you referring to an Arizona tax return? I ask because this seems like a familiar Arizona question.
IF SO: The context of this question is most likely a potential estimated payment penalty, so the amount would be found on line 52 -- Balance of tax -- of your 2020 Form 140.
According to Line 76 - Estimated Payment Penalty of the Form 140 instructions found at Form 140,
Do not complete Arizona Form 221, Underpayment of Estimated Tax by Individuals, if the amount on Form 140, line 53, is more than the amount on Form 140, line 52.
IF NOT: Please clarify further.
