If you earned income in the last few years but you didn’t file a tax return because your wages were below the filing requirement, the Internal Revenue Service may have some money for you. The IRS also has millions of dollars in checks that are returned each year as undeliverable. Here’s what you need to know about these two types of “missing money” and how to claim it: Unclaimed Refunds Some people earn income and may have taxes withheld from their wages but are not required to file a tax return because they have too little income.