delivered the opinion of the Court.
In these two cases we are called upon to decide whether a summons directing an attorney to produce documents delivered to him by his client in connection with the attorney-client relationship is enforceable over claims that the documents were constitutionally immune from summons in the hands of the client and retained that immunity in the hands of the attorney.
I
In each case, an Internal Revenue agent visited the taxpayer or taxpayers1 and interviewed them in con*394nection with an investigation of possible civil or criminal liability under the federal income tax laws. Shortly after the interviews — one day later in No. 74-611 and a week or two later in No. 74-18 — the taxpayers obtained from their respective accountants certain documents relating to the preparation by the accountants of their tax returns. Shortly after obtaining the documents — later the same day in No. 74-611 and a few weeks later in No. 74-18 — the taxpayers transferred the documents to their lawyers — respondent Kasmir and petitioner Fisher, respectively — each of whom was retained to assist the taxpayer in connection with the investigation. Upon learning of the whereabouts of the documents, the Internal Revenue Service served summonses on the attorneys directing them to produce documents listed therein. In No. 74r-6U, the documents were described as "the following records of Tannebaum Bindler & Lewis [the accounting firm].
"1. Accountant's work papers pertaining to Dr. E. J. Mason's books and records of 1969, 1970 and 1971.[2]
“2. Retained copies of E. J. Mason’s income tax returns for 1969, 1970 and 1971.
“3. Retained copies of reports and other correspondence between Tannebaum Bindler & Lewis and Dr. E. J. Mason during 1969, 1970 and 1971.”
In No. 74-18, the documents demanded were analyses by the accountant of the taxpayers’ income and expenses which had been copied by the accountant from the taxpayers’ canceled checks and deposit receipts.3 In No. *39574-611, a summons was also served on the accountant directing him to appear and testify concerning the documents to be produced by the lawyer. In each case, the lawyer declined to comply with the summons directing production of the documents, and enforcement actions were commenced by the Government under 26 U. S. C. §§ 7402 (b) and 7604 (a). In No. 74-611, the attorney raised in defense of the enforcement action the taxpayer’s accountant-client privilege, his attorney-client privilege, and his Fourth and Fifth Amendment rights. In No. 74-18, the attorney claimed that enforcement would involve compulsory self-incrimination of the taxpayers in violation of their Fifth Amendment privilege, would involve a seizure of the papers without necessary compliance with the Fourth Amendment, and would violate the taxpayers’ right to communicate in confidence with their attorney. In No. 74-18 the taxpayers intervened and made similar claims.
In each case the summons was ordered enforced by the District Court and its order was stayed pending appeal. In No. 74-18, 500 F. 2d 683 (CA3 1974), petitioners’ appeal raised, in terms, only their Fifth Amendment claim, but they argued in connection with that claim that enforcement of the summons would involve a violation of the taxpayers’ reasonable expectation of privacy and particularly so in light of the confidential relationship of attorney to client. The Court of Appeals for the Third Circuit after reargument en banc affirmed the enforcement order, holding that the taxpayers had never acquired a possessory interest in the documents and that the papers were not immune in the hands of the attorney. In No. 74-611, a divided panel of the Court of Appeals for the Fifth Circuit reversed the enforcement order, 499 F. 2d 444 (1974). The court reasoned that by virtue of the Fifth Amendment the documents would have been privileged *396from production pursuant to summons directed to the taxpayer had he retained possession and, in light of the confidential nature of the attorney-client relationship, the taxpayer retained, after the transfer to his attorney, “a legitimate expectation of privacy with regard to the materials he placed in his attorney's custody, that he retained constructive possession of the evidence, and thus . . . retained Fifth Amendment protection.” 4 Id,., at 453. We granted certiorari to resolve the conflict created. 420 U. S. 906 (1975). Because in our view the documents were not privileged either in the hands of the lawyers or of their clients, we affirm the judgment of the Third Circuit in No. 74-18 and reverse the judgment of the Fifth Circuit in No. 74N511.
II
All of the parties in these cases and the Court of Appeals for the Fifth Circuit have concurred in the proposition that if the Fifth Amendment would have excused a taxpayer from turning over the accountant’s papers had he possessed them, the attorney to whom they are delivered for the purpose of obtaining legal advice should also be immune from subpoena. Although we agree with this proposition for the reasons set forth in Part III, infra, we are convinced that, under our decision in Couch v. United States, 409 U. S. 322 (1973), it is not the taxpayer’s Fifth Amendment privilege that would excuse the attorney from production.
The relevant part of that Amendment provides:
“No person . .,. shall be compelled in any criminal case to be a witness against himself.” (Emphasis added.)
*397The taxpayer’s privilege under this Amendment is not violated by enforcement of the summonses involved in these cases because enforcement against a taxpayer’s lawyer would not “compel” the taxpayer to do anything — and certainly would not compel him to be a “witness” against himself. The Court has held repeatedly that the Fifth Amendment is limited to prohibiting the use of “physical or moral compulsion” exerted on the person asserting the privilege, Perlman v. United States, 247 U. S. 7, 15 (1918); Johnson v. United States, 228 U. S. 457, 458 (1913); Couch v. United States, supra, at 328, 336. See also Holt v. United States, 218 U. S. 245, 252-253 (1910); United States v. Dionisio, 410 U. S. 1 (1973); Schmerber v. California, 384 U. S. 757, 765 (1966); Burdeau v. McDowell, 256 U. S. 465, 476 (1921); California Bankers Assn. v. Shultz, 416 U. S. 21, 55 (1974). In Couch v. United States, supra, we recently ruled that the Fifth Amendment rights of a taxpayer were not violated by the enforcement of a documentary summons directed to her accountant and requiring production of the taxpayer’s own records in the possession of the accountant. We did so on the ground that in such a case “the ingredient of personal compulsion against an accused is lacking.” 409 U. S., at 329.
Here, the taxpayers are compelled to do no more than was the taxpayer in Couch. The taxpayers’ Fifth Amendment privilege is therefore not violated by enforcement of the summonses directed toward their attorneys. This is true whether or not the Amendment would have barred a subpoena directing the taxpayer to produce the documents while they were in his hands.
The fact that the attorneys are agents of the taxpayers does not change this result. Couch held as much, since the accountant there was also the taxpayer’s agent, and in this respect reflected a longstanding view. In *398Hale v. Henkel, 201 U. S. 43, 69-70 (1906), the Court said that the privilege “was never intended to permit [a person] to plead the fact that some third person might be incriminated by his testimony, even though he were the agent of such person .... [T]he Amendment is limited to a person who shall be compelled in any criminal case to be a witness against himself ” (Emphasis in original.) “It is extortion of information from the accused himself that offends our sense of justice.” Couch v. United States, supra, at 328. Agent or no, the lawyer is not the taxpayer. The taxpayer is the “accused,” and nothing is being extorted from him.
Nor is this one of those situations, which Couch suggested might exist, where constructive possession is so clear or relinquishment of possession so temporary and insignificant as to leave the personal compulsion upon the taxpayer substantially intact. 409 U. S., at 333. In this respect we see no difference between the delivery to the attorneys in these cases and delivery to the accountant in the Couch case. As was true in Couch, the documents sought were obtainable without personal compulsion on the accused.
Respondents in No. 74-611 and petitioners in No. 74-18 argue, and the Court of Appeals for the Fifth Circuit apparently agreed, that if the summons was enforced, the taxpayers’ Fifth Amendment privilege would be, but should not be, lost solely because they gave their documents to their lawyers in order to obtain legal advice. But this misconceives the 'nature of the constitutional privilege. The Amendment protects a person from being compelled to be a witness against himself. Here, the taxpayers retained any privilege they ever had not to be compelled to testify against themselves and not to be compelled themselves to produce private papers in their possession. This personal privilege was in no way decreased by the transfer. It is simply that by *399reason of the transfer of the documents to the attorneys, those papers may be subpoenaed without compulsion on the taxpayer. The protection of the Fifth Amendment is therefore not available. “A party is privileged from producing evidence but not from its production.” Johnson v. United States, supra, at 458.
The Court of Appeals for the Fifth Circuit suggested that because legally and ethically the attorney was required to respect the confidences of his client, the latter had a reasonable expectation of privacy for the records in the hands of the attorney and therefore did not forfeit his Fifth Amendment privilege with respect to the records by transferring them in order to obtain legal advice. It is true that the Court has often stated that one of the several purposes served by the constitutional privilege against compelled testimonial self-incrimination is that of protecting personal privacy. See, e. g., Murphy v. Waterfront Comm’n, 378 U. S. 52, 55 (1964); Couch v. United States, supra, at 332, 335-336; Tehan v. United States ex rel. Shott, 382 U. S. 406, 416 (1966); Davis v. United States, 328 U. S. 582, 587 (1946). But the Court has never suggested that every invasion of privacy violates the privilege. Within the limits imposed by the language of the Fifth Amendment, which we necessarily observe, the privilege truly serves privacy interests; but the Court has never on any ground, personal privacy included, applied the Fifth Amendment to prevent the otherwise proper acquisition or use of evidence which, in the Court’s view, did not involve compelled testimonial self-incrimination of some sort.5
*400The proposition that the Fifth Amendment protects private information obtained without compelling self-incriminating testimony is contrary to the clear statements of this Court that under appropriate safeguards private incriminating statements of an accused may be overheard and used in evidence, if they are not compelled at the time they were uttered, Katz v. United States, 389 U. S. 347, 354 (1967); Osborn v. United States, 385 U. S. 323, 329-330 (1966); and Berger v. New York, 388 U. S. 41, 57 (1967); cf. Hoffa v. United States, 385 U. S. 293, 304 (1966); and that disclosure of private information may be compelled if immunity removes the risk of incrimination. Kastigar v. United States, 406 U. S. 441 (1972). If the Fifth Amendment protected generally against the obtaining of private information from a man’s mouth or pen or house, its protections would presumably not be lifted by probable cause and a warrant or by immunity. The privacy invasion is not mitigated by immunity; and the Fifth Amendment’s strictures, unlike the Fourth’s, are not removed by showing reasonableness. The Framers addressed the subject of personal privacy directly in the Fourth Amendment. They struck a balance so that when the State’s reason to believe incriminating evidence will be found becomes sufficiently great, the invasion of privacy becomes justified and a warrant to search and seize will issue. They did not seek in still another Amendment — the Fifth — to achieve a general protection of privacy but to deal with the more specific issue of compelled self-incrimination.
*401We cannot cut the Fifth Amendment completely loose from the moorings of its language, and make it serve as a general protector of privacy — a word not mentioned in its text and a concept directly addressed in the Fourth Amendment. We adhere to the view that the Fifth Amendment protects against “compelled self-incrimination, not [the disclosure of] private information.” United States v. Nobles, 422 U. S. 225, 233 n. 7 (1975).
Insofar as private information not obtained through compelled self-incriminating testimony is legally protected, its protection stems from other sources6 — the Fourth Amendment's protection against seizures without warrant or probable cause and against subpoenas which suffer from “too much indefiniteness or breadth in the things required to be 'particularly described,’ ” Oklahoma Press Pub. Co. v. Walling, 327 U. S. 186, 208 (1946); In re Horowitz, 482 F. 2d 72, 75-80 (CA2 1973) (Friendly, J.); the First Amendment, see NAACP v. Alabama, 357 U. S. 449, 462 (1958); or evidentiary privileges such as the attorney-client privilege.7
*402Ill
Our above holding is that compelled production of documents from an attorney does not implicate whatever Fifth Amendment privilege the taxpayer might have enjoyed from being compelled to produce them himself. The taxpayers in these cases, however, have from the outset consistently urged that they should not be forced to expose otherwise protected documents to summons simply because they have sought legal advice and turned the papers over to their attorneys. The Government appears to agree unqualifiedly. The difficulty is that the taxpayers have erroneously relied on the Fifth Amendment without urging the attorney-client privilege in so many words. They have nevertheless invoked the relevant body of law and policies that govern the attorney-client privilege. In this posture of the case, we feel obliged to inquire whether the attorney-client privilege applies to documents in the hands of an attorney which would have been privileged in the hands of the client by reason of the Fifth Amendment.8
*403Confidential disclosures by a client to an attorney made in order to obtain legal assistance are privileged. 8 J. Wigmore, Evidence § 2292 (McNaughton rev. 1961) (hereinafter Wigmore); McCormick § 87, p. 175. The purpose of the privilege is to encourage clients to make full disclosure to their attorneys. 8 Wigmore § 2291, and §2306, p. 590; McCormick §87, p. 175, §92, p. 192; Baird v. Koerner, 279 F. 2d 623 (CA9 1960); Modern Woodmen of America v. Watkins, 132 F. 2d 352 (CA5 1942); Prichard v. United States, 181 F. 2d 326 (CA6), aff’d per curiam, 339 U. S. 974 (1950); Schwimmer v. United States, 232 F. 2d 855 (CA8 1956); United States v. Goldfarb, 328 F. 2d 280 (CA6 1964). As a practical matter, if the client knows that damaging information could more readily be obtained from the attorney following disclosure than from himself in the absence of disclosure, the client would be reluctant to confide in his lawyer and it would be difficult to obtain fully informed legal advice. However, since the privilege has the effect of withholding relevant information from the factfinder, it applies only where necessary to achieve its purpose. Accordingly it protects only those disclosures — necessary to obtain informed legal advice — which might not have been made absent the privilege. In re Horowitz, supra, at 81 (Friendly, J.); United States v. Goldfarb, supra; 8 Wigmore § 2291, p. 554; McCormick § 89, p. 185. This Court and the lower courts have thus uniformly held that pre-existing documents which could have been obtained by court process from the client when he was in possession may also be obtained from the attorney by similar process following transfer by the client in order *404to obtain more informed legal advice. Grant v. United States, 227 U. S. 74, 79-80 (1913); 8 Wigmore § 2307, and cases there cited; McCormick § 90, p. 185; Falsone v. United States, 205 F. 2d 734 (CA5 1953); Sovereign Camp, W. O. W. v. Reed, 208 Ala. 457, 94 So. 910 (1922); Andrews v. Mississippi R. Co., 14 Ind. 169, 98 N. E. 49 (1860); Palatini v. Sarian, 15 N. J. Super. 34, 83 A. 2d 24 (1951); Pearson v. Yoder, 39 Okla. 105, 134 P. 421 (1913); State ex rel Sowers v. Olwell, 64 Wash. 2d 828, 394 P. 2d 681 (1964). The purpose of the privilege requires no broader rule. Pre-existing documents obtainable from the client are not appreciably easier to obtain from the attorney after transfer to him. Thus, even absent the attorney-client privilege, clients will not be discouraged from disclosing the documents to the attorney, and their ability to obtain informed legal advice will remain unfettered. It is otherwise if the documents are not obtainable by subpoena duces tecum or summons while in the exclusive possession of the client, for the client will then be reluctant to transfer possession to the lawyer unless the documents are also privileged in the latter’s hands. Where the transfer is made for the purpose of obtaining legal advice, the purposes of the attorney-client privilege would be defeated unless the privilege is applicable. “It follows, then, that when the client himself would be privileged from production of the document, either as a party at common law ... or as exempt from self-incrimination, the attorney having possession of the document is not bound to produce.” 8 Wigmore § 2307, p. 592. Lower courts have so held. Id., § 2307, p. 592 n. 1, and cases there cited; United States v. Judson, 322 F. 2d 460, 466 (CA9 1963); Colton v. United States, 306 F. 2d 633, 639 (CA2 1962). This proposition was accepted by the Court of Appeals for the Fifth Circuit below, is asserted by petitioners *405in No. 74-18 and respondents in No. 74^611, and was conceded by the Government in its brief and at oral argument. Where the transfer to the attorney is for the purpose of obtaining legal advice, we agree with it.
Since each taxpayer transferred possession of the documents in question from himself to his attorney in order to obtain legal assistance in the tax investigations in question, the papers, if unobtainable by summons from the client, are unobtainable by summons directed to the attorney by reason of the attorney-client privilege. We accordingly proceed to the question whether the documents could have been obtained by summons addressed to the taxpayer while the documents were in his possession. The only bar to enforcement of such summons asserted by the parties or the courts below is the Fifth Amendment’s privilege against self-incrimination. On this question the Court of Appeals for the Fifth Circuit in No. 74-611 is at odds with the Court of Appeals for the Second Circuit in United States v. Beattie, 522 F. 2d 267 (1975), cert. pending, Nos. 75-407, 75-700.
> H-i
The proposition that the Fifth Amendment prevents compelled production of documents over objection that such production might incriminate stems from Boyd v. United States, 116 U. S. 616 (1886). Boyd involved a civil forfeiture proceeding brought by the Government against two partners for fraudulently attempting to import 35 cases of glass without paying the prescribed duty. The partnership had contracted with the Government to furnish the glass needed in the construction of a Government building. The glass specified was foreign glass, it being understood that if part ,or all of the glass was furnished from the partnership’s existing duty-paid in*406ventory, it could be replaced by duty-free imports. Pursuant to this arrangement, 29 cases of glass were imported by the partnership duty free. The partners then represented that they were entitled to duty-free entry of an additional 35 cases which were soon to arrive. The forfeiture action concerned these 35 cases. The Government’s position was that the partnership had replaced all of the glass used in construction of the Government building when it imported the 29 cases. At trial, the Government obtained a court order directing the partners to produce an invoice the partnership had received from the shipper covering the previous 29-case shipment. The invoice was disclosed, offered in evidence, and used, over the Fifth Amendment objection of the partners, to establish that the partners were fraudulently claiming a greater exemption from duty than they were entitled to under the contract. This Court held that the invoice was inadmissible and reversed the judgment in favor of the Government. The Court ruled that the Fourth Amendment applied to court orders in the nature of subpoenas duces tecum in the same manner in which it applies to search warrants, id., at 622; and that the Government may not, consistent with the Fourth Amendment, seize a person’s documents or other property as evidence unless it can claim a proprietary interest in the property superior to that of the person from whom the property is obtained. Id., at 623-624. The invoice in question was thus held to have been obtained in violation of the Fourth Amendment. The Court went on to hold that the accused in a criminal case or the defendant in a forfeiture action could not be forced to produce eviden-tiary items without violating the Fifth Amendment as well as the Fourth. More specifically, the Court declared, “a compulsory production of the private books and papers of the owner of goods sought to be forfeited ... is compelling him to be a witness against him*407self, within the meaning of the Fifth Amendment to the Constitution.” Id., at 634-635. Admitting the partnership invoice into evidence had violated both the Fifth and Fourth Amendments.
Among its several pronouncements, Boyd was understood to declare that the seizure, under warrant or otherwise, of any purely evidentiary materials violated the Fourth Amendment and that the Fifth Amendment rendered these seized materials inadmissible. Gouled v. United States, 255 U. S. 298 (1921); Agnello v. United States, 269 U. S. 20 (1925); United States v. Lefkowitz, 285 U. S. 452 (1932). That rule applied to documents as well as to other evidentiary items — “[t]here is no special sanctity in papers, as distinguished from other forms of property, to render them immune from search and seizure, if only they fall within the scope of the principles of the cases in which other property may be seized . . . .” Gouled v. United States, supra, at 309. Private papers taken from the taxpayer, like other “mere evidence,” could not be used against the accused over his Fourth and Fifth Amendment objections.
Several of Boyd’s express or implicit declarations have not stood the test of time. The application of the Fourth Amendment to subpoenas was limited by Hale v. Henkel, 201 U. S. 43 (1906), and more recent cases. See, e. g., Oklahoma Press Pub. Co. v. Walling, 327 U. S. 186 (1946). Purely evidentiary (but “nontestimonial”) materials, as well as contraband and fruits and instru-mentalities of crime, may now be searched for and seized under proper circumstances, Warden v. Hayden, 387 U. S. 294 (1967).9 Also, any notion that “testimonial” evidence may never be seized and used in evidence is *408inconsistent with Katz v. United States, 389 U. S. 347 (1967); Osborn v. United States, 386 U. S. 323 (1966); and Berger v. New York, 388 U. S. 41 (1967), approving the seizure under appropriate circumstances of conversations of a person suspected of crime. See also Marron v. United States, 275 U. S. 192 (1927).
It is also clear that the Fifth Amendment does not independently proscribe the compelled production of every sort of incriminating evidence but applies only when the accused is compelled to make a testimonial communication that is incriminating. We have, accordingly, declined to extend the protection of the privilege to the giving of blood samples, Schmerber v. California, 384 U. S. 757, 763-764 (1966);10 to the giving of handwriting exemplars, Gilbert v. California, 388 U. S. 263, 265-267 (1967); voice exemplars, United States v. Wade, 388 U. S. 218, 222-223 (1967); or the donning of a blouse worn by the perpetrator, Holt v. United States, 218 U. S. 245 (1910). Furthermore, despite Boyd, neither a partnership nor the individual partners are shielded from compelled production of partnership records on self-incrimination grounds. Bellis v. United States, 417 U. S. 85 (1974). It would appear that under that case the precise claim sustained in Boyd would now be rejected for reasons not there considered.
The pronouncement in Boyd that a person may not be forced to produce his private papers has nonetheless often appeared as dictum in later opinions of this Court. See, e. g., Wilson v. United States, 221 U. S. 361, 377 (1911); Wheeler v. United States, 226 U. S. 478, 489 (1913); United States v. White, 322 U. S. 694, 698-699 *409(1944); Davis v. United States, 328 U. S., at 587-588; Schmerber, supra, at 763-764; Couch v. United States, 409 U. S., at 330; Bellis v. United States, supra, at 87. To the extent, however, that the rule against compelling production of private papers rested on the proposition that seizures of or subpoenas for “mere evidence,” including documents, violated the Fourth Amendment and therefore also transgressed the Fifth, Gouled v. United States, supra, the foundations for the rule have been washed away. In consequence, the prohibition against forcing the production of private papers has long been a rule searching for a rationale consistent with the proscriptions of the Fifth Amendment against compelling a person to give “testimony” that incriminates him. Accordingly, we turn to the question of what, if any, incriminating testimony within the Fifth Amendment’s protection, is compelled by a documentary summons.
A subpoena served on a taxpayer requiring him to produce an accountant’s workpapers in his possession without doubt involves substantial compulsion. But it does not compel oral testimony; nor would it ordinarily compel the taxpayer to restate, repeat, or affirm the truth of the contents of the documents sought. Therefore, the Fifth Amendment would not be violated by the fact alone that the papers on their face might incriminate the taxpayer, for the privilege protects a person only against being incriminated by his own compelled testimonial communications. Schmerber v. California, supra; United States v. Wade, supra; and Gilbert v. California, supra. The accountant’s workpapers are not the taxpayer’s. They were not prepared by the taxpayer, and they contain no testimonial declarations by him. Furthermore, as far as this record demonstrates, the preparation of all of the papers sought in these cases was wholly voluntary, and they cannot be said to contain compelled *410testimonial evidence, either of the taxpayers or of anyone else.11 The taxpayer cannot avoid compliance with the subpoena merely by asserting that the item of evidence which he is required to produce contains incriminating writing, whether his own or that of someone else.
The act of producing evidence in response to a subpoena nevertheless has communicative aspects of its own, wholly aside from the contents of the papers produced. Compliance with the subpoena tacitly concedes the existence of the papers demanded and their possession or control by the taxpayer. It also would indicate the taxpayer’s belief that the papers are those described in the subpoena. Curcio v. United States, 354 U. S. 118, 125 (1957). The elements of compulsion are clearly present, but the more difficult issues are whether the tacit aver-ments of the taxpayer are both “testimonial” and “incriminating” for purposes of applying the Fifth Amendment. These questions perhaps do not lend themselves to categorical answers; their resolution may instead depend on the facts and circumstances of particular cases or classes thereof. In light of the records now before us, we are confident that however incriminating the *411contents of the accountant’s workpapers might be, the act of producing them — the only thing which the taxpayer is compelled to do — would not itself involve testimonial self-incrimination.
It is doubtful that implicitly admitting the existence and possession of the papers rises to the level of testimony within the protection of the Fifth Amendment. The papers belong to the accountant, were prepared by him, and are the kind usually prepared by an accountant working on the tax returns of his client. Surely the Government is in no way relying on the “truthtelling” of the taxpayer to prove the existence of or his access to the documents. 8 Wigmore § 2264, p. 380. The existence and location of the papers are a foregone conclusion and the taxpayer adds little or nothing to the sum total of the Government’s information by conceding that he in fact has the papers. Under these circumstances by enforcement of the summons “no constitutional rights are touched. The question is not of testimony but of surrender.” In re Harris, 221 U. S. 274, 279 (1911).
When an accused is required to submit a handwriting exemplar he admits his ability to write and impliedly asserts that the exemplar is his writing. But in common experience, the first would be a near truism and the latter self-evident. In any event, although the exemplar may be incriminating to the accused and although he is compelled to furnish it, his Fifth Amendment privilege is not violated because nothing he has said or done is deemed to be sufficiently testimonial for purposes of the privilege. This Court has also time and again allowed subpoenas against the custodian of corporate documents or those belonging to other collective entities such as unions and partnerships and those of bankrupt businesses over claims that the documents will incriminate the custodian despite the fact that producing the documents tacitly admits their existence and their location in the *412hands of their possessor. E. g., Wilson v. United States, 221 U. S. 361 (1911); Dreier v. United States, 221 U. S. 394 (1911); United States v. White, 322 U. S. 694 (1944); Bellis v. United States, 417 U. S. 85 (1974); In re Harris, supra. The existence and possession or control of the subpoenaed documents being no more in issue here than in the above cases, the summons is equally enforceable.
Moreover, assuming that these aspects of producing the accountant’s papers have some minimal testimonial significance, surely it is not illegal to seek accounting help in connection with one’s tax returns or for the accountant to prepare workpapers and deliver them to the taxpayer. At this juncture, we are quite unprepared to hold that either the fact of existence of the papers or of their possession by the taxpayer poses any realistic threat of incrimination to the taxpayer.
As for the possibility that responding to the subpoena would authenticate12 the workpapers, production would *413express nothing more than the taxpayer’s belief that the papers are those described in the subpoena. The taxpayer would be no more competent to authenticate the accountant’s workpapers or reports13 by producing them than he would be to authenticate them if testifying orally. The taxpayer did not prepare the papers and could not vouch for their accuracy. The documents would not be admissible in evidence against the taxpayer without authenticating testimony. Without more, responding to the subpoena in the circumstances before us would not appear to represent a substantial threat of self-incrimination. Moreover, in Wilson v. United States, supra; Dreier v. United States, supra; United States v. White, supra; Bellis v. United States, supra; and In re Harris, supra, the custodian of corporate, union, or partnership books or those of a bankrupt business was ordered to respond to a subpoena for the business’ books even though doing so involved a "representation that the documents produced are those demanded by the subpoena,” Curcio v. United States, 354 U. S., at 125.14
*414Whether the Fifth Amendment would shield the taxpayer from producing his own tax records in his possession is a question not involved here; for the papers demanded here are not his “private papers,” see Boyd v. United States, 116 U. S., at 634-635. We do hold that compliance with a summons directing the taxpayer to produce the accountant’s documents involved in these cases would involve no incriminating testimony within the protection of the Fifth Amendment.
The judgment of the Court of Appeals for the Fifth Circuit in No. 74-611 is reversed. The judgment of the Court of Appeals for the Third Circuit in No. 7-4-18 is affirmed.
So ordered.
Mr. Justice Stevens took no part in the consideration or disposition of these cases.
In No. 74-18, the taxpayers are husband and wife who filed a joint return. In No. 74-611, the taxpayer filed an individual return.
The “books and records” concerned the taxpayer’s large medical practice.
The husband taxpayer’s checks and deposit receipts related to his textile waste business. The wife’s related to her women’s wear shop.
The respondents in No. 74-611 did not, in terms, rely on the attorney-client privilege or the Fourth Amendment before the Court of Appeals.
There is a line of eases in which the Court stated that the Fifth Amendment was offended by the use in evidence of documents or property seized in violation of the Fourth Amendment. Gouled v. United States, 255 U. S. 298, 306 (1921); Agnello v. United States, 269 U. S. 20, 33-34 (1925); United States v. Lefkowitz, 285 U. S. 452, 466-467 (1932); Mapp v. Ohio, 367 U. S. 643, 661 (1961) (Black, *400J., concurring). But the Court purported to find elements of compulsion in such situations. “In either case he is the unwilling source of the evidence, and the Fifth Amendment forbids that he shall be compelled to be a witness against himself in a criminal case.” Gouled v. United States, supra, at 306. In any event the predicate for those cases, lacking here, was a violation of the Fourth Amendment. Cf. Burdeau v. McDowell, 256 U. S. 465, 475-476 (1921).
In Couch v. United States, 409 U. S. 322 (1973), on which taxpayers rely for their claim that the Fifth Amendment protects their “legitimate expectation of privacy,” the Court differentiated between the things protected by the Fourth and Fifth Amendments. “We hold today that no Fourth or Fifth Amendment claim can prevail where, as in this case, there exists no legitimate expectation of privacy and no semblance of governmental compulsion against the person of the accused.” Id., at 336.
The taxpayers and their attorneys have not raised arguments of a Fourth Amendment nature before this Court and could not be successful if they had. The summonses are narrowly drawn and seek only documents of unquestionable relevance to the tax investigation. Special problems of privacy which might be presented by subpoena of a personal diary, United States v. Bennett, 409 F. 2d 888, 897 (CA2 1969) (Friendly, J.), are not involved here.
First Amendment values are also plainly not implicated in these cases.
Federal Rule Evid. 501, effective January 2, 1975, provides that with respect to privileges the United States district courts “shall be governed by the principles of the common law . . . interpreted . . . in the light of reason and experience.” Thus, whether or not Rule 501 applies to this case, the attorney-client privilege issue is governed by the principles and authorities discussed and cited infra. Fed. Rule Crim. Proc. 26.
In No. 74-611, the taxpayer did not intervene, and his rights have been asserted only through his lawyer. The parties disagree on the question whether an attorney may claim the Fifth Amendment privilege of his client. We need not resolve this question. The only privilege of the taxpayer involved here is the attorney-client privilege, and it is universally accepted that the attorney-client privilege may be raised by the attorney, C. McCormick, Evidence § 92, p. 193, § 94, p. 197 (2d ed. 1972) (hereinafter McCormick); Republic Gear Co. v. Borg-Warner Corp., 381 F. 2d 551 (CA2 1967); Bouschor v. United States, 316 F. 2d 451 (CA8 1963); Colton v. *403United States, 306 F. 2d 633 (CA2 1962); Schwimmer v. United States, 232 F. 2d 865 (CA8), cert. denied, 352 U. S. 833 (1956); Baldwin v. Commissioner, 125 F. 2d 812 (CA9 1942).
Citing to Schmerber v. California, 384 U. S. 757 (1966), Warden v. Hayden, 387 U. S., at 302-303, reserved the question “whether there are items of evidential value whose very nature precludes them from being the object of a reasonable search and seizure.”
The Court’s holding was: “Since the blood test evidence, although an incriminating product of compulsion, was neither petitioner’s testimony nor evidence relating to some communicative act or writing by petitioner, it was not inadmissible on privilege grounds.” 384 U. S., at 765.
The fact that the documents may have been written by the person asserting the privilege is insufficient to trigger the privilege, Wilson v. United States, 221 U. S. 361, 378 (1911). And, unless the Government has compelled the subpoenaed person to write the document, cf. Marchetti v. United States, 390 U. S. 39 (1968); Grosso v. United States, 390 U. S. 62 (1968), the fact that it was written by him is not controlling with respect to the Fifth Amendment issue. Conversations may be seized and introduced in evidence under proper safeguards, Katz v. United States, 389 U. S. 347 (1967); Osborn v. United States, 385 U. S. 323 (1966); Berger v. New York, 388 U. S. 41 (1967); United States v. Bennett, 409 F. 2d, at 897 n. 9, if not compelled. In the case of a documentary subpoena the only thing compelled is the act of producing the document and the compelled act is the same as the one performed when a chattel or document not authored by the producer is demanded. McCormick § 128, p. 269.
The “implicit authentication” rationale appears to be the prevailing justification for the Fifth Amendment’s application to documentary subpoenas. Schmerber v. California, 384 U. S., at 763-764 (“the privilege reaches . . . the compulsion of responses which are also communications, for example, compliance with a subpoena to produce one’s papers. Boyd v. United States, 116 U. S. 616”); Couch v. United States, 409 U. S., at 344, 346 (Marshall, J., dissenting) (the person complying with the subpoena “implicitly testifies that the evidence he brings forth is in fact the evidence demanded”); United States v. Beattie, 522 F. 2d 267, 270 (CA2 1975) (Friendly, J.) (“[a] subpoena demanding that an accused produce his own records is . . . the equivalent of requiring him to take the stand and admit their genuineness”), cert. pending, Nos. 75-407, 75-700; 8 Wigmore § 2264, p. 380 (the testimonial component involved in compliance with an order for production of documents or chattels “is the witness’ assurance, compelled as an incident of the process, that the articles produced are the ones demanded”); McCormick § 126, p. 268 (“[t]his rule [applying the Fifth Amendment privilege to documentary subpoenas] is defended on the *413theory that one who produces documents (or other matter) described in the subpoena duces tecum represents, by his production, that the documents produced are in fact the documents described in the subpoena”); People v. Defore, 242 N. Y. 13, 27, 150 N. E. 585, 590 (1926) (Cardozo, J.) (“A defendant is 'protected from producing his documents in response to a subpoena duces tecum, for his production of them in court would be his voucher of their genuineness.’ There would then be ‘testimonial compulsion’ ”).
In seeking the accountant’s “retained copies” of correspondence with the taxpayer in No. 74-611, we assume that the summons sought only “copies” of original letters sent from the accountant to the taxpayer — the truth of the contents of which could be testified to only by the accountant.
In these cases compliance with the subpoena is required even though the books have been kept by the person subpoenaed and his producing them would itself be sufficient authentication to permit their introduction against him.