The Internal Revenue Service might be looking for you -- but not for the reasons that you think. The IRS is actually looking to dole out refunds worth more than $123.5 million to taxpayers whose refund checks were returned to the IRS by the U.S. Postal Service due to mailing address errors.

IRS Commissioner Doug Shulman wants taxpayers to come forward, saying, "We are eager to get this money into the hands of taxpayers, so don't delay if you think you are missing a refund. The sooner you update your address information, the quicker you can get your refund."

Updating your address with the IRS is easy. You can update your address online by visiting the "Where's My Refund?" tool on the IRS web site or use the telephone version of "Where's My Refund?" by calling 1-800-829-1954. You can also complete a Form 8822, Change of Address, downloadable as a pdf via the IRS web site or call 800–TAX–FORM (800–829–3676) to have a Form 8822 mailed to you.

The average number of undeliverable refunds rose by 16% this year, but the 107,831 refunds which remain outstanding still total less than 1% of the more than 142 million returns processed by the IRS. If you haven't received your refund, check with the IRS to see if your check was one of those returned by the post office. If it wasn't, and your check remains undelivered, you can receive a replacement check within six to eight weeks of making a claim by calling 1-800-829-1954.

Remember, a tax refund is your money. Don't leave it on the table.