In a case described in subdivision (ii) or (iii) of this subparagraph, the applicant is to set forth the information in a document separate from the remainder of the application for a determination letter or other documents. The separate document is to state why the information is to be witheld from public inspection under section 6104(a)(1) (C) or (D). If the Internal Revenue Service has not requested the information, the separate document is to also state why it is impossible to provide the Internal Revenue Service sufficient information to support the application for a determination letter without including information which is to be withheld. The separate document should clearly identify the relevant portion of the application for a determination letter or other document (the document, page, paragraph, and line) to which the information set forth in the separate document relates. The Internal Revenue Service will withhold from public inspection (including inspection by a plan participant or authorized representative) information contained in the separate document if the Commissioner determines that the information is in fact information of the type described in section 6104(a)(1) (C) or (D), and, in the case of information relating to any trade secret, patent, process, style of work or apparatus, the Commissioner further determines that disclosure would be adverse to the applicant. If the Commissioner determines that the information will be disclosed, the organization will be given 15 days after notification of the Commissioner's decision to contest the decision before the document is disclosed.
26 C.F.R. §301.6104(a)-5
Secs. 6104(a)(1)(A), 6104(a)(1)(B), and 7805 of the Internal Revenue Code of 1954 (72 Stat. 1660, 88 Stat. 940, 68A Stat. 917; 26 U.S.C. 6104(a)(1)(A) , 6104(a)(1)(B) , 7805 )