In addition to the credit allowed under subsection (a), a taxpayer may credit against the tax imposed by section 3301 for any taxable year an amount, with respect to the unemployment compensation law of each State certified as provided in section 3303 for the 12-month period ending on October 31 of such year, or with respect to any provisions thereof so certified, equal to the amount, if any, by which the contributions required to be paid by him with respect to the taxable year were less than the contributions such taxpayer would have been required to pay if throughout the taxable year he had been subject under such State law to the highest rate applied thereunder in such 12-month period to any person having individuals in his employ, or to a rate of 5.4 percent, whichever rate is lower.
In applying subsection (c), the tax imposed by section 3301 shall be computed at the rate of 6 percent in lieu of the rate provided by such section.
For purposes of subsection (c), wages shall be attributable to a particular State if they are subject to the unemployment compensation law of the State, or (if not subject to the unemployment compensation law of any State) if they are determined (under rules or regulations prescribed by the Secretary) to be attributable to such State.
Paragraph (2) of subsection (c) shall not apply with respect to any State for the taxable year if (as of the beginning of November 10 of such year) there is no balance of advances referred to in such paragraph.
If any percentage referred to in either subparagraph (B) or (C) of subsection (c)(2) is not a multiple of .1 percent, it shall be rounded to the nearest multiple of .1 percent.
The percentage referred to in subsection (c)(2)(B) or (C) for any taxable year for any State having a balance referred to therein shall be determined by the Secretary of Labor, and shall be certified by him to the Secretary of the Treasury before June 1 of such year, on the basis of a report furnished by such State to the Secretary of Labor before May 1 of such year. Any such State report shall be made as of the close of March 31 of the taxable year, and shall be made on such forms, and shall contain such information, as the Secretary of Labor deems necessary to the performance of his duties under this section.
If the credit reduction under subsection (c)(2) is limited by reason of paragraph (1) of this subsection for any taxable year, for purposes of applying subsection (c)(2) to subsequent taxable years (including years after 1987), the taxable year for which the credit reduction was so limited (and January 1 thereof) shall not be taken into account.
The Secretary of Labor may, by regulations, require a State to furnish such information at such time and in such manner as may be necessary for purposes of this subsection.
The definitions and special rules set forth in subsection (d) shall apply to this subsection in the same manner as they apply to subsection (c).
In the case of any State which meets requirements of paragraph (2) with respect to any taxable year, subsection (c)(2) shall not apply to such taxable year; except that such taxable year (and January 1 of such taxable year) shall (except as provided in subsection (f)(3)) be taken into account for purposes of applying subsection (c)(2) to succeeding taxable years.
The term “potential additional taxes” means, with respect to any State for any taxable year, the aggregate amount of the additional tax which would be payable under this chapter for such taxable year by all taxpayers subject to the unemployment compensation law of such State for such taxable year if paragraph (2) of subsection (c) had applied to such taxable year and any preceding taxable year without regard to this subsection but with regard to subsection (f).
The Secretary of Labor may require a State to furnish such information at such time and in such manner as may be necessary for purposes of paragraph (2).
If a certified professional employer organization (as defined in section 7705), or a customer of such organization, makes a contribution to the State’s unemployment fund with respect to wages paid to a work site employee, such certified professional employer organization shall be eligible for the credits available under this section with respect to such contribution.