20 C.F.R. § 606.25
A provision of subsection (c)(2) of section 3302 of FUTA provides that, for a State that qualifies, the additional tax credit reduction applicable under subparagraph (C), beginning in the fifth consecutive year of a balance of outstanding advances, shall be waived and the additional tax credit reduction applicable under subparagraph (B) shall be substituted. The waiver and substitution are granted if the OWS Administrator determines that the State has taken no action, effective during the 12-month period ending on September 30 of the year for which the waiver and substitution are requested, which has resulted or will result in a net decrease in the solvency of the State unemployment compensation system as determined for the purposes of §§ 606.20(a)(2) and 606.21(b) .
20 C.F.R. §606.25