Have you received a tax refund if you are owed one? The IRS reports that it is looking for 99,123 taxpayers who are owed $153 million in refunds. Their checks were undeliverable because of mailing address errors.
If you believe that you are owed a refund check, you can follow up in two ways:
Avoid delivery problems in the future by using the direct deposit option on your 2011 tax return. If you e-file your return, this expedites receipt of your refund.
Source: IR-2011-113, 11/30/11
For an individual, his or her Social Security number; for businesses, fiduciaries, and other non-individual taxpayers, the employer identification number.