Pub. L. 89-554, tit. 5, pt. III, subpt. D, ch. 55, subch. V, sec. 5547
Limitation on premium pay
§ 5547. Limitation on premium pay An employee may be paid premium pay under this subchapter only to the extent that the payment does not cause his aggregate rate of pay for any pay period to exceed the maximum rate for GS-15.