Form 4506-C is published and currently available online. Previous versions of the Form 4506-C will be accepted through February 28,2023. Effective March 1, 2023, prior versions will only be accepted if signed and dated by the taxpayer by Feb 28, 2023. Form 4506-C signed on March 1, 2023, or after must use the Form 4506-C revision 10-2022. The new Form 4506-C cannot be edited. Form 4506-C revision 10-2022 cannot use Care Of (c/o) or Doing Business As (DBA) and will be rejected if more than one company is present on line 5a or 5d.

The customer must fill out the form as they intend it to be processed. Lines 5 through 8 must be complete before the taxpayer signs. The exceptions to this are the following:

•    Line 5aii, IVES participant ID number
•    Line 5aiii, SOR Mailbox ID
•    Line 5b, Customer File Number
•    Line 5c Unique Identifier (if included)