Although the failure timely to notify the appropriate administrative authority of a discrimination complaint against a federal agency may bar the claim, tardy notification does not deprive the court of jurisdiction of the subject matter, Coke v. General Adjustment Bureau, Inc., 640 F.2d 584, No. 77-2874 (5th Cir. March 23, 1981) (en banc), but instead results in dismissal because the claim lacks merit. Lack of timeliness in notifying the EEO counselor or in filing a written administrative complaint may be waived, 29 C.F.R. § 1613.214(a)(4) (1980), formerly 5 C.F.R. § 713.214(a)(4) (1978), or the commencement of the running of the time period may be subject to equitable delay until the claimant knew or should have known the facts that would give rise to his Title VII claim. Chappell v. Emco Machine Works Co., 601 F.2d 1295, 1303 (5th Cir. 1979); Bickham v. Miller, 584 F.2d 736 (5th Cir. 1978) (federal employee case); Reeb v. Economic Opportunity Atlanta, Inc., 516 F.2d 924 (5th Cir. 1975). See also Cooper v. Bell, 628 F.2d 1208, 1212-14 (9th Cir. 1980) (federal employee case). We apply these principles to the facts that the employee, Mr. Oaxaca, might have proved as shown by the pleadings and Oaxaca's affidavit without at this time attempting to determine the merits of Oaxaca's claim.

Oaxaca, a Mexican-American, had been a GS-9 Auditor with the Army Audit Agency when he resigned that position to enter law school. He sought nighttime employment with the IRS by telephone, but was told he would have to take an examination. Both on the phone and at the time Oaxaca took the examination he explained to the IRS representatives that he was a former Civil Service employee with reinstatement rights, but he was informed that he was nevertheless required to take the examination. He passed the examination and was employed part-time by the IRS with a GS-2 classification from March 21, 1977, through May 1, 1977. He applied for a tax examiner's position with a GS-6 rating but limited his application to a position on the four hour night shift. No positions were filled for that shift during the next filing season. On July 25, 1977, Oaxaca's IRS supervisor prepared a performance evaluation giving him a composite score of eighty-four. The supervisor gave him no credit for his prior Civil Service experience because the IRS Service Center gave credit only for prior experience at the Service Center. Although Oaxaca had moved to a new address and had informed the IRS of his change of address, notice of the evaluation was mailed to his old address. Oaxaca contends that he did not receive it.

On April 10, 1978, Oaxaca returned to work at the IRS in his former GS-2 position. That same day he inquired about his performance evaluation and his application for the tax examiner's position. He was informed of his performance evaluation score and that he had not been promoted to the higher rated GS-6 position, but was not informed that the IRS had not filled any positions on the shift he had requested. On April 18, within thirty days of the date he returned to work, Oaxaca notified the EEO counselor that he thought the supervisor discriminated against him in failing to give him the credit due him for his prior Civil Service experience and that the failure of the agency to place him initially in a position with a higher rating as well as the failure to promote him to such a position resulted from discrimination against Oaxaca due to his national origin. Thereafter, he timely filed a formal administrative complaint. Because 180 days had elapsed since Oaxaca filed his administrative complaint and no final agency decision had been rendered, Oaxaca filed this suit in district court. See Section 717(c) of Title VII, 42 U.S.C. § 2000e-16(c) (1972), and 29 C.F.R. § 1613.281 (1980), formerly 5 C.F.R. § 713.281 (1978). After the district court made its determination that subject matter jurisdiction was lacking and dismissed the claim, Oaxaca was notified that the final agency action on his administrative claim was a finding of no discrimination.

Federal law forbids discrimination in all personnel actions affecting federal employees or applicants for employment. Section 717(a) of Title VII, 42 U.S.C. § 2000e-16(a) (1972). The Civil Service Commission previously had the authority, now vested in the EEOC, to enforce the statute and to issue rules and regulations necessary and appropriate to carry out its responsibilities. Section 717(b) of Title VII, 42 U.S.C. § 2000e-16(b) (1972). The regulations1 require complaints to be submitted in writing and permit an agency to "accept the complaint for processing ... only if ... (t)he complainant brought to the attention of the Equal Employment Opportunity Counselor the matter causing him to believe he had been discriminated against within 30 calendar days of the date of that matter...." 29 C.F.R. § 1613.214(a)(1) (1980), formerly 5 C.F.R. § 713.214(a)(1) (1978).

Although Oaxaca did not comply with the thirty-day notice requirement, in other respects he has complied with the regulatory and statutory procedures. He contends that, by accepting and processing his complaint, the agency defendant waived its objection to his failure timely to give notice.

The regulations allow the government agency to extend the thirty-day limit for notification under certain circumstances. 29 C.F.R. § 1613.214(a)(4) (1980), formerly 5 C.F.R. § 713.214(a)(4) (1978), provides:

The agency shall extend the time limits in this section : (i) When the complainant shows that he was not notified of the time limits and was not otherwise aware of them, or that he was prevented by circumstances beyond his control from submitting the matter within the time limits; or (ii) for other reasons considered sufficient by the agency. (emphasis added.)

Based on this regulation, we concluded in Huntley v. Department of HEW, 550 F.2d 290, 295 (5th Cir. 1977), that, once the government agency accepts a complaint and acts on it, the time limit mentioned in the regulation for making a complaint to the EEO office of that agency is not mandatory. While this statement in Huntley is unqualified, the agency in that case had not only investigated the complaint but had determined that the complainant had been the victim of discrimination. We think that the Huntley holding is limited to the situation in which the agency has in fact made a finding of discrimination, and we reject Oaxaca's contention that the federal agency, by merely accepting and investigating a tardy complaint, automatically waives its objection to the complainant's failure to comply with the prescribed time delays.2

In Bickham v. Miller, 584 F.2d 736 (5th Cir. 1978), we again considered the thirty-day limitation applicable to federal employee administrative complaints. The district court had granted the defendant's motion to dismiss because plaintiff did not submit an administrative complaint within thirty days of the alleged discriminatory promotion denial. The opinion in Bickham does not indicate whether the agency had in fact processed the tardy complaint. Therefore, this court's affirmance of the district court's dismissal for what it called "lack of jurisdiction" in Bickham is not necessarily inconsistent with the Huntley holding, although Bickham does not cite Huntley.

Bickham also discusses the possibility of an equitable delay in the commencement of the running of the thirty-day period, applying the principle adopted in Reeb v. Economic Opportunity Atlanta, Inc., 516 F.2d 924 (5th Cir. 1975). Reeb involved a private sector employee who failed timely to file a charge with the EEOC. Reeb holds that the time period for filing an EEOC complaint does not begin to run until the facts that would support a charge of discrimination would have been apparent to a person with a reasonably prudent regard for his rights, situated similarly to the plaintiff. Reeb v. Economic Opportunity Atlanta, Inc., 516 F.2d at 931. Applying the Reeb rule, the Bickham court held that the employee should have investigated the cause of the denial of promotion and thus the thirty-day time period began to run at the time she learned of the denial of her application for promotion, not five months later when she discovered that no woman had served on the promotion evaluation committee. Bickham v. Miller, 584 F.2d at 738. See Cooper v. Bell, 628 F.2d 1208, 1213 (9th Cir. 1980) (applying equitable tolling for federal employee filing period).

The district court in this case did not cite Huntley but did apply the Bickham-Reeb test. It determined that Oaxaca "should have investigated the cause of his being assigned a lower Civil Service rating than he felt he was entitled to and the cause of his nonpromotion at the time those events occurred." This determination was, however, reached based on allegations in the pleadings and Oaxaca's affidavit without taking testimony.

We have held that the time limits in Title VII for giving notice or filing an administrative complaint are subject to equitable tolling. Chappell v. Emco Machine Works Co., 601 F.2d 1295 (5th Cir. 1979); Reeb v. Economic Opportunity Atlanta, Inc., 516 F.2d 924 (5th Cir. 1975). In Bickham v. Miller, 584 F.2d 736 (5th Cir. 1978), we applied the Reeb holding, which permits an equitable delay in the commencement of the running of the time period under certain circumstances, to a case involving a federal agency employee. See Cooper v. Bell, 628 F.2d 1208, 1213 (9th Cir. 1980) (equitable delay theory applied in case involving federal employee). We have made it clear in Coke that it is a misnomer to consider these time limits, even when applicable, as involving the subject matter jurisdiction of the court. Coke v. General Adjustment Bureau, Inc., 640 F.2d at 591 n.14. Properly evaluated, they relate to the merits of the complaint. McArthur v. Southern Airways, Inc., 569 F.2d 276, 278-81 (5th Cir. 1978) (Rubin, J. & Vance, J., dissenting).

The regulation, moreover, requires that the agency "shall" extend the time limits when the complainant shows that he was not notified of them and was not aware of them. See Bragg v. Reed, 592 F.2d 1136 (10th Cir. 1979); Ettinger v. Johnson, 518 F.2d 648 (3d Cir. 1975), 556 F.2d 692 (3d Cir. 1977). The government concedes in oral argument that the IRS did not notify Oaxaca of the time limits. He should be given the opportunity to show that he was not aware of them, despite his government employment and his education, and the government should be given an opportunity to prove his awareness. Similarly, Oaxaca should be given a chance to establish facts that may entitle him to an equitable tolling or delay in the commencement of the running of the thirty-day time period.

While Oaxaca did not request an evidentiary hearing on the government's motion to dismiss, he asserted both the court's subject matter jurisdiction and his right to relief. A motion to dismiss for want of subject matter jurisdiction can take the form of a facial attack on the complaint, requiring the court merely to assess whether the plaintiff has alleged a sufficient basis of subject matter jurisdiction, taking all allegations in the complaint as true. Menchaca v. Chrysler Credit Corp., 613 F.2d 507, 511 (5th Cir. 1980), cert. denied, --- U.S. ----, 101 S. Ct. 358, 66 L. Ed. 2d 217 (1980). A factual attack on the subject matter jurisdiction of the court, however, challenges the facts on which jurisdiction depends and matters outside of the pleadings, such as affidavits and testimony, are considered. Menchaca v. Chrysler Credit Corp., 613 F.2d at 511; McLain v. Real Estate Board of New Orleans, Inc., 583 F.2d 1315, 1318 n.1 (5th Cir. 1978), vacated and remanded on other grounds, 444 U.S. 232, 100 S. Ct. 502, 62 L. Ed. 2d 441 (1980). See Green v. Forney Engineering Co., 589 F.2d 243, 246 (5th Cir. 1979). Thus, an evidentiary hearing may, in some instances, be required on a motion to dismiss challenging the subject matter jurisdiction of the court. See generally 5 C. Wright and A. Miller, Federal Practice and Procedure: Civil § 1350 (1969).

However, dismissal for failure to act timely, like dismissal for expiration of the statute of limitations, is properly raised by a Rule 12(b)(6), Fed.R.Civ.P., motion to dismiss for failure to state a claim. Ware v. Associated Milk Producers, Inc., 614 F.2d 413 (5th Cir. 1980); White v. Padgett, 475 F.2d 79 (5th Cir.), cert. denied, 414 U.S. 861, 94 S. Ct. 78, 38 L. Ed. 2d 112 (1973). See 5 C. Wright & A. Miller, Federal Practice and Procedure: Civil § 1277, at 336 (1969). A Rule 12(b)(6) motion to dismiss should not be granted unless it appears from the pleadings beyond doubt that the plaintiff can prove no set of facts in support of his claim that would entitle him to relief. Conley v. Gibson, 355 U.S. 41, 45-46, 78 S. Ct. 99, 102, 2 L. Ed. 2d 80, 84 (1957); Ware v. Associated Milk Producers, Inc., 614 F.2d at 415.

If the issue raised by a Rule 12(b)(6) motion to dismiss cannot be resolved on the face of the pleadings, the motion may be converted by the court into a motion for summary judgment. See 5 C. Wright & A. Miller, Federal Practice & Procedure: Civil § 1366 (1969). After the parties are given adequate opportunity to develop whether there are genuine disputes of material fact, it may be possible to resolve the issue of timeliness without an evidentiary hearing. See Hickey v. Arkla Industries, Inc., 615 F.2d 239 (5th Cir. 1980) (parties are entitled to ten days notice that a motion to dismiss under Rule 12(b)(6), Fed.R.Civ.P., is being treated as a Rule 56, Fed.R.Civ.P., motion for summary judgment). If, however, there remain genuine disputes of material fact, timeliness of filing, like the applicability of the statute of limitations, can be resolved only after an evidentiary hearing.

In view of the promptness with which Oaxaca subsequently acted, we need not here consider how long after the occurrence of the events the lack of awareness of the time delays or an equitable tolling of the running of the time period for notification or filing may be asserted or whether either excuse might be barred by laches or for some other reason.

Therefore, we REVERSE the dismissal and REMAND for further proceedings consistent with this opinion.