You will need/want to make a claim against the CPA's error and omissions insurance (E&O Insurance). Since CPA's are regulated, you should be able to find the information with a little digging around.
However, when it comes to tax returns, it can be difficult to prove the CPA was at fault since the information that goes into the tax return is supplied by the taxpayer.
In any event, best of luck.
You might also want to request a penalty abatement from the IRS. Sometimes the IRS is sympathetic when a taxpayer has relied on the expertise of an accountant and will grant a penalty abatement request.
firstname.lastname@example.org Office number: (860) 255-7423 Website: www.cttaxhelp.com. Our reply to your question has not created an attorney-client relationship. It should not be considered legal advice. You should contact an Attorney who can give you legal advice after acquainting themselves with the specifics of your case.
Ms. Campbell and Mr. Berkus gave you excellent responses. In short, you may have a reason to go to Small Claims court. The CPA may have E&O coverage. However, proving fault is not easy.