Unless the Secretary of the Treasury finds that the collection of a tax is in jeopardy, in carrying out the provisions of section
4971 of title
26 (relating to taxes on the failure to meet minimum funding standards), the Secretary of the Treasury shall notify the Secretary of Labor before sending a notice of deficiency with respect to any tax imposed under that section on an employer, and, in accordance with the provisions of subsection (d) of that section, afford the Secretary of Labor an opportunity to comment on the imposition of the tax in the case. The Secretary of the Treasury may waive the imposition of the tax imposed under section
4971
(b) of title
26 in appropriate cases. Upon receiving a written request from the Secretary of Labor or from the Pension Benefit Guaranty Corporation, the Secretary of the Treasury shall cause an investigation to be commenced expeditiously with respect to whether the tax imposed under section
4971 of title
26 should be applied with respect to any employer to which the request relates. The Secretary of the Treasury and the Secretary of Labor shall consult with each other from time to time with respect to the provisions of section
412 of title
26 (relating to minimum funding standards) and with respect to the funding standards applicable under subchapter I of this chapter in order to coordinate the rules applicable under such standards.