Example: In January 2001, W becomes a limited partner in partnership P, and in February 2001, she starts her own business from which she earns $100,000 of net income for the year. H and W file a joint return for tax year 2001, on which they claim $20,000 in losses from their investment in P, and they omit W's self-employment tax. In March 2003, the Internal Revenue Service commences an audit under the provisions of subchapter C of chapter 63 of subtitle F of the Internal Revenue Code (TEFRA partnership proceeding) and sends H and W a notice under section 6223(a)(1). In September 2003, the Internal Revenue Service audits H's and W's 2001 joint return regarding the omitted self-employment tax. H may file a claim for relief from joint and several liability for the self-employment tax liability because he has received a notification of an audit indicating that there may be an outstanding liability on the joint return. However, his claim for relief regarding the TEFRA partnership proceeding is premature under paragraph (b)(5) of this section. H will have to wait until the Internal Revenue Service sends him a notice of computational adjustment or assesses the liability resulting from the TEFRA partnership proceeding before he files a claim for relief with respect to any such liability. The assessment relating to the TEFRA partnership proceeding is separate from the assessment for the self-employment tax; therefore, H's subsequent claim for relief for the liability from the TEFRA partnership proceeding is not precluded by his previous claim for relief from the self-employment tax liability under this paragraph (c).
26 C.F.R. §1.6015-5