Have you been asking clients if the use Crypto currencies the last four years?
Nope, not directly. Probably should have. I try to limit questions to general areas to have no more than one page of questions that are designed to give us a jumping off point to ask more detailed questions. I use two general questions about sale of assets and another on miscellaneous income.
The only time I dealt directly on this issue was a potential client who wanted to know what to do with past years. He never hired me . I always had suspicion that person was testing me because I think he was recording our discussions and tried getting me to filing in a way that is not correct. He also had excuse for not using a tax attorney I advised him to use because of possible criminal issues.