I sent my business and personal returns through Claude this year before signing, and it turns out they were a horror show of unforgivably stupid mistakes. Pretty infuriating considering what my now former CPA was charging me.

He amortized the goodwill of businesses I acquired over 5 years instead of 15 (incredibly basic stuff, which Claude flagged with *CRITICAL ERROR*). When I asked about it, he said he had caught the error in his review but forgot to save after he fixed it. I don't know if there's a good response to making that kind of a mistake, but if there is, it's definitely not that one.