Every year, the Internal Revenue Service (IRS) has millions of dollars in tax refunds that go undelivered or unclaimed.  Undelivered Federal Tax Refund Checks Refund checks are mailed to your last known address. If you move without notifying the IRS or the U.S. Postal Service (USPS), your refund check may be returned to the IRS. If you were expecting a federal tax refund and did not receive it, check the IRS' Where’s My Refund page. You'll need to enter your Social Security number, filing status, and the exact whole dollar amount of your refund. You may be prompted to change your address online.  You can also call the IRS to check on the status of your refund. Wait times to speak with a representative can be long. But, you can avoid waiting by using the automated phone system. Follow the message prompts when you call. If you move, submit a Change of Address - Form 8822 to the IRS; you should also submit a Change of Address to the USPS. Unclaimed Federal Tax Refunds  If you are eligible for a federal tax refund and don’t file a return, then your refund will go unclaimed. Even if you aren't required to file a return, it might benefit you to file if: Federal taxes were withheld from your pay and/or You qualify for the Earned Income Tax Credit (EITC) You may not have filed a tax return because your wages were below the filing requirement. But you can still file a return within three years of the filing deadline to get your refund. State Refund Checks For information about your state tax refund check, contact your state revenue department.