Has AZ said whether or not they will automatically refund those amounts or are amended returns necessary?
Do you mean, he filed the AZ 140-SBI and paid 3.5% instead of the higher rate that would apply to interest and dividends, which as we all know are "small business income" even for people who have never worked a day in their life? That had nothing to do with Prop 208.
You seem to have put all text in as Title, and no text in for the topic subject matter. If you search the web, you can find examples such as:
https://azdor.gov/news-events-notices/news/guidance-taxpayers-following-prop-208-ruling
They tell you what not to do.
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