IRS, July 2018: 501(c)(4) groups and most other nonprofits, other than charities, no longer have to report their donors' names and addresses to the IRS.
Organizations described in section 501(c), other than section 501(c)(3) organizations, are no longer required to report the names and addresses of their contributors on the Schedule B
p. 1
IRS, July 2018: 501(c)(4) groups and most other nonprofits, other than charities, no longer have to report their donors' names and addresses to the IRS.