Assume you are referring to a corporate or partnership return? Or payroll taxes? It is possible to reopen...consult your tax advisor, CPA for details.
This is not legal advice nor intended to create an attorney-client relationship. The information provided here is informational in nature only. This attorney may not be licensed in the jurisdiction which you have a question about so the answer could be only general in nature. Visit Steve Zelinger's website: http://www.stevenzelinger.com/
You need to correct this situation. If you filed a form 1065 and marked it final, amend the return and correct your mistake. A local CPA can help you do this.
H. Daniel Lively, Esq., LL.M., CPA Certified Tax Specialist, CA Board of Legal Specialization email@example.com www.USTaxRescue.com 714-708-2593 Mr. Lively is a Certified Tax Specialist by the State Bar of California Board of Legal Specialization. He can be reached at 714-708-2593 or USTaxRescue.com.Any individual seeking legal advice for their own situation should retain their own legal counsel as this response provides information that is general in nature and not specific to any person's unique situation. Circular 230 Disclaimer - Advice given in this response cannot be used to eliminate penalties with the IRS or any other governmental agency.