29 C.F.R. § 1614.106 : Labor — REGULATIONS RELATING TO LABOR — EQUAL EMPLOYMENT OPPORTUNITY COMMISSION — FEDERAL SECTOR EQUAL EMPLOYMENT OPPORTUNITY — AGENCY PROGRAM TO PROMOTE EQUAL EMPLOYMENT OPPORTUNITY — Individual complaints

(a) A complaint must be filed with the agency that allegedly discriminated against the complainant.
(b) A complaint must be filed within 15 days of receipt of the notice required by § 1614.105.
(c) A complaint must contain a signed statement from the person claiming to be aggrieved or that person's attorney. This statement must be sufficiently precise to identify the aggrieved individual and the agency and to describe generally the action(s) or practice(s) that form the basis of the complaint. The complaint must also contain a telephone number and address where the complainant or the representative can be contacted.
(d) A complainant may amend a complaint at any time prior to the conclusion of the investigation to include issues or claims like or related to those raised in the complaint. After requesting a hearing, a complainant may file a motion with the administrative judge to amend a complaint to include issues or claims like or related to those raised in the complaint.
(e) The agency shall acknowledge receipt of a complaint or an amendment to a complaint in writing and inform the complainant of the date on which the complaint or amendment was filed. The agency shall advise the complainant in the acknowledgment of the EEOC office and its address where a request for a hearing shall be sent. Such acknowledgment shall also advise the complainant that:
(1) The complainant has the right to appeal the final action on or dismissal of a complaint; and
(2) The agency is required to conduct an impartial and appropriate investigation of the complaint within 180 days of the filing of the complaint unless the parties agree in writing to extend the time period. When a complaint has been amended, the agency shall complete its investigation within the earlier of 180 days after the last amendment to the complaint or 360 days after the filing of the original complaint, except that the complainant may request a hearing from an administrative judge on the consolidated complaints any time after 180 days from the date of the first filed complaint.

29 C.F.R. § 1614.106

57 FR 12646, 4/10/1992, as amended at 64 FR 37656, 7/12/1999