If a mortgage broker is asking for a CPA letter on a non-QM loan for a self-employed borrower on a P and L non-QM loan, what does this mean? What if my accountant is not a Certified Public Accountant but is a professional tax preparer and does tax preparation for me individually and my businesses. Do you need need to be a CPA to do a CPA letter for a mortgage lender on a P and L non-QM loan for self-employed borrower?