Have you ever thought about why there aren't AI tax prep companies coming out of the woodwork? Perfect application: drudgery! Legible rules! Expensive human experts!
It's because they (rightly) expect that enough of their customers would get in trouble from bad advice that they'd be sued out of existence, if not indicted themselves.
That's how it should be with all AI apps. Be accountable for what you claim your model does, or don't ship it.