How Long are Passport Photos Valid for use with ATF Tax Stamp Applications?

According to the ATF, passport photos must be taken within 1 year prior to the date of application.

Excerpt from the ATF Form 4 below:

g.  Photographs and Fingerprints. An individual transferee, except if licensed as a manufacturer, importer, or dealer under the GCA, must (1) attach to item 15 of the ATF Form 4, except for the CLEO copy a 2 inch x 2 inch photograph of the frontal view of the transferee taken within 1 year prior to the date of the application and (2) submit two properly completed FBI Forms FD-258 (Fingerprint Card with blue lines) with the application. The fingerprints must be clear for accurate classification and taken by someone properly equipped to take them. 

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