What is the difference between a “certified” and a “notarized” document?

A certified document is one that the original issuing agency provides and certifies as an exact copy of the original document and contains an official stamped seal from the Agency. These documents will be accepted. A notarized document is one that the taxpayer provides to a public notary who bears witness to the signing of the official document and affixes a seal assuring that the document is legitimate. These documents will not be accepted for ITIN applications. Note there are some applicants who are exempt from this change.