Fair Pay Act of 1999

(Sec. 4) Prohibits the discharge of or any other discrimination against an individual for opposing any act or practice made unlawful by this Act, or for assisting in an investigation or proceeding under it.

(Sec. 5) Directs courts, in any action brought under this Act for violation of such prohibition, to allow expert fees as part of the costs awarded to prevailing plaintiffs. Allows any such action to be maintained as a class action.

(Sec. 6) Requires employers subject to such prohibition to: (1) preserve records which document and support the method, system, calculations, and other bases used by the employer in establishing, adjusting, and determining the wages paid to their employees, for periods of time prescribed by the Equal Employment Opportunity Commission (EEOC); and (2) make reports to the EEOC.

(Sec. 7) Directs the EEOC to: (1) undertake studies and provide information and technical assistance to employers, labor organizations, and the general public concerning effective means available to implement this Act; (2) carry on a continuing program of research, education, and technical assistance with specified components related to the purposes of this Act; and (3) include a separate evaluation and appraisal regarding the implementation of this Act in its annual report to the Congress.

(Sec. 8) Makes conforming amendments relating to congressional and executive branch employees under the Congressional Accountability Act of 1995 and the Presidential and Executive Office Accountability Act.