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Text: Respondents are Canadian citizens and residents who maintained bank accounts with the Northwestern Commercial Bank in Bellingham, Washington. In attempting to ascertain their Canadian income tax liability for 1980, 1981, and 1982, the Canadian Department of National Revenue (Revenue Canada) asked the Internal Revenue Service (IRS) in January 1984 to secure and provide pertinent bank records. Revenue Canada made its requests pursuant to Articles XIX and XXI of the 1942 Convention.[1] The IRS Director of Foreign Operations _x0097_ the "competent authority" under Article XIX _x0097_ concluded that Revenue Canada's requests fell within the scope of the Convention and that it would be appropriate for the United States to honor them. App. 27-28. Specifically, he found that "the requested information is not within the possession of the Internal Revenue Service or the Canadian tax authorities; that the requested information may be relevant to a determination of the correct tax liability of [respondents] under Canadian law; and that the same type of information can be obtained by tax authorities under Canadian law." Id., at 28. Thus, on April 2, 1984, the IRS served on Northwestern Commercial Bank administrative summonses for the requested information.

At respondents' behest, the bank refused to comply. In accordance with 26 U.S. C. § 7609(b)(2), respondents petitioned the United States District Court for the Western District of Washington to quash the summonses. Only one of their claims is before us. Respondents contended that because the IRS may not issue a summons to further its investigation of a United States taxpayer when a Justice Department referral is in effect, 26 U.S. C. § 7602(c), and because Revenue Canada's investigation of each of them was, in the words of the IRS Director of Foreign Operations, "a criminal investigation, preliminary stage," App. 28, United States law proscribed the use of a summons to obtain information for Canadian authorities regarding respondents' American bank accounts. The Magistrate who held a consolidated hearing on respondents' claims rejected this argument. Without addressing their contention that the IRS may not issue a summons pursuant to a request by Revenue Canada once a Canadian tax investigation has reached a stage equivalent to a Justice Department referral for criminal prosecution, the Magistrate found that, even if respondents' legal claims were assumed to have merit, they had failed to carry their burden of showing that the Canadian authorities' investigation had advanced that far. App. to Pet. for Cert. 31a. Upon considering the Magistrate's report and respondents' objections to it, the District Court ordered the bank to comply with the summonses. Id., at 25a-26a, 34a-35a.

After the Court of Appeals for the Ninth Circuit stayed the enforcement orders pending appeal, a divided panel of the court reversed. 813 F.2d 243 (1987). The Ninth Circuit held that a summons issued pursuant to a request under the 1942 Convention, like one issued as part of a domestic tax investigation, will be enforced only if it was issued in good faith. The Court of Appeals further stated that the elements of good faith we described in United States v. Powell, supra, at 57-58, are not exhaustive; rather, in light of our subsequent decision in United States v. LaSalle National Bank, 437 U.S. 298 (1978), and Congress' enactment of what is now 26 U.S. C. § 7602(c), good faith in domestic tax investigations also requires that the IRS not have referred the case to the Justice Department for possible criminal prosecution. Finally, and most significantly for purposes of this litigation, the Ninth Circuit ruled that the IRS acts in good faith in complying with a request for information under the 1942 Convention only when Canadian authorities act in good faith in seeking IRS assistance, and that the good faith of Canadian authorities should be judged by the same standard applicable to the IRS when it conducts a domestic investigation. Hence, the Court of Appeals concluded, before the IRS may honor a request for information it must determine that Revenue Canada's investigation has not reached a stage analogous to a Justice Department referral by the IRS. In addition, the Court of Appeals said, "in order to establish its prima facie case by affidavit, the IRS must make an affirmative statement" that Canadian authorities are acting in good faith and that their investigation has not yet reached that stage; the burden of proof on this point rests initially with the IRS rather than the taxpayer attempting to quash a summons, the court held, because the IRS "can consult with Canada's competent authority and can be expected to have greater familiarity with Canadian administrative procedures." 813 F.2d, at 250. The Court of Appeals reversed the District Court's decision because the affidavits submitted by the IRS failed to state that Revenue Canada's investigation of respondents had not yet reached a point analogous to an IRS referral to the Justice Department.

We granted certiorari, 485 U.S. 1033 (1988), to resolve a conflict between the Ninth Circuit's decision in this case and the Second Circuit's holding in United States v. Manufacturers & Traders Trust Co., 703 F.2d 47 (1983). We now reverse.