ANSWER

Expert Mark Anderson's Answer:

You need to file an amended tax return. Specifically, file form 1040x which can be access at the IRS website www.irs.gov I hope this answers your question.

Expert Linda Burroughs's Answer:

Please file an amended tax return to correct the error. The amended return needs to state the reason, a calculation of the adjustment, and attachement of all affected schedules. If additional tax is owed, it is recommended that the payment is sent along with the amended return.