Get a copy of the accountant's professional standards. Accountants are all licensed by state professional associations, and these associations require adherence to written professional standards of ethics and competence. These standards are available to the public upon request.
Determine exactly how your accountant failed to meet the above professional standards when handling your taxes. You will need to choose the breach in such a way that there is a direct relationship between the accountant's failure and your losses. For example, an accountant has a duty of professional care that is higher than the duty that the IRS would hold you to if you prepared your own taxes (because he is professionally licensed). If he made a careless error, you can allege a breach of the duty of care.
Trace the exact causal relationship between the accountant's breach and your loss. For example, if your accountant attempted to claim an illegal tax deduction that caused you to underpay your taxes, you will be able to claim any actual damages that were reasonably foreseeable consequences of this error.
Calculate the exact amount of damages that you suffered as a result of your accountant's malpractice. Although you should include both direct and indirect damages, such as interest, penalties, fines, or interruption of your business caused by IRS seizure of your assets, you will not be able to claim damages that were not caused by your accountant's error (an unrelated error that did not cost you any money, for example).
Draft a civil complaint in which you allege all four of the above elements. You should also ask for court costs and attorney's fees, although the court may refuse to award them to you. File this complaint with the state district court. If an issue of federal law is involved (an interpretation of the federal Internal Revenue Code, for example), you may file suit in the federal district court that represents your district.
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