To claim a refund, you must file an amended return within 3 years after the date you filed your original return or 2 years after the date you paid the tax. Many find the easiest way to figure the entries for Form.X is to first make the changes in the margin of the return they are amending. 1. Review your return for additional errors or omissions. 2. If you haven't already done so, please submit ONE of the following: • A signed copy of the original 2022 IRS Form 1040 and all schedules. Learn how to check the status of your tax refund, request a direct deposit of your individual income tax refund, or contact DOR customer service. Letter 4464C means the IRS is holding your refund while the agency reviews your tax return. This letter is not an audit. This notice provides taxpayers with information on the extensions of time to file returns and remit tax and the waivers from penalty and interest. Welcome to the Indiana Department of Revenue.