Arizona has a line item on your tax return for the "I didn't pay enough" tax. You can elect to pay any amount you'd like over your legal tax burden. Predictably

Arizona has a line item on your tax return for the "I didn't pay enough" tax. You can elect to pay any amount you'd like over your legal tax burden. Predictably, it's raised a few thousand dollars and hasn't made any significant dent in the state's revenues.