During such time as the Federal Unemployment Tax Act is amended so that employers are allowed, against the tax imposed by Section 3301 of that act, credits amounting to 100 percent of such tax on account of contributions paid under this division, then the additional amount of contributions provided for by Section 993 shall be required to be paid into the Unemployment Fund.

(Amended by Stats. 1961, Ch. 2153. Section operative as prescribed in Section 994.)