The specific instructions for the check boxes in Box b, Kind of Employer, of Form W-3 include examples for various types of section 501(c) organizations. For more information, see Box b—Kind of Employer in the form instructions.
What to Report
Form W-3 is completed only when paper Copy
A of Form(s) W-2 are
being filed. Do not file Form W-3 for Form(s) W-2 that were
submitted electronically to the Social Security Administration.
To Social Security Administration
Paper: The last day of February
* If date shown falls on a Saturday, Sunday or
legal holiday, the due date is the next business day.
Where To File
Federal - Paper