The Internal Revenue Service is looking for 115,478 taxpayers who are due refund checks worth about $110 million, after those checks were returned as undeliverable.

The refund checks, averaging about $953, can be claimed as soon as taxpayers update their addresses with the IRS. Some taxpayers have more than one check waiting.

In Utah, the IRS is looking for 1,197 taxpayers who have refund checks worth $1,236,889.06, or an average amount of $1,033.32 per Utahn that has an undelivered refund check.

The "Where's My Refund?" tool on IRS.gov enables taxpayers to check the status of their refunds. A taxpayer must submit his or her Social Security number, filing status and amount of refund shown on their 2006 return. The tool will provide the status of the refund and in some cases provide instructions on how to resolve delivery problems.

Taxpayers can access a telephone version of "Where's My Refund?" by calling 1-800-829-1954.