The IRS accepts electronic signatures on Form 4506-C as long as they are obtained through an approved method. One such method is the use of a commercial software product that is listed on the IRS website. The software must be able to create, store, and transmit the signed form and any required attachments. The taxpayer or their representative must keep a copy of the signed form and any related documents for their records. Another method is the use of a notary public who is authorized to take acknowledgments or administer oaths in the jurisdiction where the taxpayer is located. The notary public must use an electronic notary seal and affix it to the signed form. The taxpayer or their representative must also keep a copy of the signed form and any related documents for their records.