The regular member contributions made to the fund as and to the extent required by section 8321 (relating to regular member contributions for current service) for current service of a joint coverage member shall be reduced by 40% of the tax on taxable wages prescribed by the Federal Insurance Contributions Act, IRC § 3101 et seq., exclusive of that portion of such tax attributable to coverage for disability and medical benefits.
24 Pa.C.S. § 8322