The regulations prescribe the manner in which social welfare organizations must notify the IRS of their intent to operate under section 501(c)(4), as required by new section 506, added to the Internal Revenue Code by the Protecting Americans from Tax Hikes Act of 2015. The regulations also address the reporting obligations related to the notification requirement and the penalties for failures to submit required notifications. The regulations will affect social welfare organizations established after December 18, 2015, and certain social welfare organizations existing on or before that date.