I don’t understand; Paul’s complaint appears to be that, based on the questions asked of him and the responses to statements by Paul, the accountant he has engaged to work for him appears to lack competency in the particular area of tax law relevant to Paul’s income taxes. If this is not, in fact, the case, we may be talking around each other.
If I have understood Paul’s complaint properly, then it really comes down to a simple question. Is it ethical to take on work in an area in which one is not sufficiently competent? In my opinion, the answer is clearly and emphatically, “No.” In fact, I’d go so far as to say that the answer is, “Hell, no,” and I can’t imagine a scenario in which my answer would differ.
The rest is just detail, and there is not a lot to go on, but a few assumptions can be made. Paul used the term “CPA” which is primarily an American term (other countries use other terms; it’s “Chartered Accountant” in the UK if I’m not mistaken). Paul is an American citizen, with a problem related to US income taxes, so I don’t think it’s unreasonable to assume that the accountant he is dealing with is a CPA licensed by a US state. Assuming these details, the AICPA is the go-to organization for questions like this; while they have no legal authority of their own, they provide most of the standards under which the practice of accounting is conducted in the US. It is not unreasonable to look to their ethical standards for guidance.
And, while the difference between my competency regarding pressure vessels v. PLCs may be greater than the difference in my wife’s competency at personal income tax v. international corporate taxation, I think the analogy is apt. My license said “Professional Engineer” and would give the casual observer no clues as to my core competencies. My wife’s license says, “Certified Public Accountant,” and similarly says absolutely nothing about her core competencies. It would be unethical for either of us to engage in work at which we were not competent, and it is our ethical responsibility to self-evaluate, and let a potential client know when proposed work is outside our areas of expertise.
I think it’s ultimately that simple. Is it ethical to work in an area in which one is not sufficiently competent as to serve the client’s needs? I say, No."