If you conspired with your accountant to defraud the government, he or she is not liable to you for his or her acts in assisting you. However, if your accountant’s acts deviated from that of a normal accountant, he or she may be liable to you for malpractice. For example, if your accountant never asked for your W-2 or included deductions on your return without discussing them with you, you may have a case against him or her.