We believe you have miscalculations on your return. The changes we made resulted in a refund. What you need to do Compare the figures on your tax return with the figures on the notice. Make the changes to your copy of your tax return for your records. Pay the amount you owe by the date on the notice's payment coupon. Contact us in writing within 60 days if you don’t agree with the changes. You may want to Call us at the phone number on the notice if you changed your address. Frequently asked questions What if I do not agree with the changes? Contact us within 60 days in writing. We’ll review your information and reverse the changes we made to your account if you can show we made a mistake. What if I do not have documentation to justify the reversal of changes? We will forward the case for audit. The auditor will contact you within 5 to 6 weeks to fully explain the process. Reference Tools Publication 5027, Identity Theft Information for Taxpayers PDF Full list of tax forms and instructions Need Help? You can authorize someone to contact the IRS on your behalf. See if you qualify for help from a Low Income Taxpayer Clinic. If you can’t find what you need online, call the IRS number at the top of your notice or letter.