Pictured is an example of a blank Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return, processed with Document Codes 17 or 19. The Primary Transaction Code 670 is used on this form. The Secondary Transaction Code 460 is used on this form. Added to the blank form are the Section 01 Alpha Field Designators (AFD) that are used in the revenue receipt program to process this form. The AFDs listed are: 01NC, Name Control.01TIN, Taxpayer Identification Number.01TXP, Tax Period.01MFT, MFT Code.01TDT, Transaction Date.01TC, Primary Transaction Code.01TA>, Primary Transaction Amount (C/Gen, Non-Correctable)