First - you need to know if the return is correct or not. Read it very carefully, and compare the reported income and expense deductions and credits to your own records. You may want to take the return with your supporting documents to a reputable CPA or tax attoney for a review.
Second, if the return is wrong, you will need to prepare a Form 1040X and file it, with supporting documents such as copies of receipts (keep your originals) proving your changes to your original return are correct.
This information is provided for educational purposes only, and is not to be relied upon as legal advice. You should consult with an attorney with full disclosure of all facts and opportunity to consider all or alternative options.
You should consult a tax attorney or CPA to help you determine if the filed tax return is incorrect. Then, if its incorrect have the return amended through a Form 1040X. Best of luck!
Andrew B. Gordon, Esq., CPA
Andrew B Gordon is a CPA and attorney licensed to practice law in Illinois. The information provided here is for educational purposes only and is not intended as legal advice for a particular matter. This response does not create any attorney-client relationship with the author. For specific advice about your particular situation, please consult an attorney.