The duty of confidentiality and attorney-client privilege protect the same relationship but do very different jobs. Privilege is an evidentiary rule: it lets a lawyer refuse to answer a subpoena, court order, or discovery request about what a client said in a legal consultation. The duty of confidentiality, set out in ABA Model Rule 1.6, is a broader ethical obligation that forbids a lawyer from revealing anything related to the representation, in any setting, whether or not a court ever asks.1American Bar Association. Rule 1.6 Confidentiality of Information The two overlap, but they are not the same, and the gap between them is where clients most often get hurt.
What Attorney-Client Privilege Covers
Attorney-client privilege is a rule of evidence. It gives the client the power to keep certain communications out of court. A judge cannot compel a lawyer to testify about those conversations or produce documents that record them. The Supreme Court in Upjohn Co. v. United States called it “the oldest of the privileges for confidential communications known to the common law.”2Legal Information Institute. Upjohn Co. v. United States
The scope is narrow. Privilege covers the communication itself — what the client told the lawyer and what the lawyer said back, spoken or written, when the client was seeking legal advice. It does not protect the underlying facts. If a client tells their lawyer they ran a red light, the fact that they ran the red light is still discoverable through other evidence; opposing counsel simply cannot force the lawyer to repeat the client’s admission.
Two conditions must be met for privilege to attach. The communication has to be intended as confidential, and it has to be made for the purpose of obtaining legal advice. Conversations with a lawyer about business strategy, personal matters, or anything outside legal counsel generally do not qualify. And the privilege belongs to the client, not the lawyer. Only the client can waive it.
What the Duty of Confidentiality Covers
Rule 1.6(a) says “a lawyer shall not reveal information relating to the representation of a client” unless the client gives informed consent, disclosure is impliedly authorized to carry out the representation, or a specific exception applies.1American Bar Association. Rule 1.6 Confidentiality of Information The phrase “relating to the representation” is doing enormous work. It reaches everything the lawyer learns in the course of the matter — not just private conversations with the client, but information pulled from public records, third-party witnesses, court filings, and the lawyer’s own observations.3Legal Information Institute. Attorneys Duty of Confidentiality
The duty follows the lawyer everywhere. A lawyer who talks about a client’s case at dinner, posts about it on social media, or trades details with colleagues at another firm has breached Rule 1.6 as clearly as one who handed documents to opposing counsel. There is no courtroom trigger required.
One point that trips up even experienced lawyers: the ABA Model Rules are templates. Each state adopts its own version, and some have altered Rule 1.6. A handful of states make certain disclosures mandatory rather than permissive, requiring lawyers to reveal information to prevent death or serious harm where the ABA version merely says they “may.” The controlling version is whatever the lawyer’s state adopted.
The Practical Difference
The clearest way to see the gap is to line the two up.
Privilege is narrow, evidentiary, and reactive. It kicks in when someone tries to compel disclosure through legal process. It covers only communications between lawyer and client made for legal advice, and only when they were meant to be confidential. Break any of those conditions and there is nothing for a lawyer to assert in court.
Confidentiality is broad, ethical, and constant. It reaches all information related to the representation, whatever its source, and it applies whether or not anyone is asking. A lawyer who never sees the inside of a courtroom on a case can still violate Rule 1.6 by talking about it in the wrong place.
This means information can be confidential without being privileged. A fact a lawyer learned from a public filing is not privileged — anyone can look it up — but the lawyer still cannot casually share it in a way that identifies the client’s matter. It also means a communication can be privileged in court while the facts inside it remain discoverable from other sources. Lawyers who treat the two as interchangeable leave gaps.
How Each Protection Breaks Down
Third Parties and Waiver
If someone outside the attorney-client relationship sits in on a conversation, privilege usually evaporates. The outsider’s presence is treated as evidence the communication was never meant to be private. There are meaningful exceptions. People functionally part of the legal team — paralegals, legal assistants, investigators, and outside experts brought in to help the lawyer understand financial or technical information — generally do not destroy privilege. Neither do family members whose presence is genuinely necessary for the client to communicate, such as a parent accompanying a minor. A friend along for moral support typically will kill it. The line is whether the third party serves the legal representation or just the client’s comfort.
Voluntarily disclosing a privileged communication to an outsider generally waives the privilege, and in some cases the waiver extends to the entire subject matter, not just the specific statement shared. Accidental disclosures during discovery are treated more forgivingly. Federal Rule of Evidence 502(b) provides that an inadvertent disclosure does not automatically waive the privilege if the holder took reasonable steps to prevent it and acted promptly to correct the error once discovered.4Legal Information Institute. Federal Rules of Evidence Rule 502 – Attorney-Client Privilege and Work Product; Limitations on Waiver Courts weigh the precautions used, how quickly the mistake was caught, the volume of discovery involved, and overall fairness.
The common interest doctrine (sometimes called the joint defense doctrine) lets parties with related legal problems share otherwise privileged information across separate legal teams without waiving privilege, but only when they are engaged in a coordinated legal strategy. The shared material must already be privileged; sharing an unprivileged document with an allied party does not turn it into protected material.
The Crime-Fraud Exception
Privilege never protects communications made to plan or carry out a crime or fraud. The protection never attaches in the first place. In Clark v. United States, the Supreme Court said that where there is prima facie evidence a client consulted a lawyer to further criminal or fraudulent activity, “the seal of secrecy is broken.”5Justia. Clark v. United States, 289 U.S. 1 (1933)
Timing matters. Discussing a crime that already happened is privileged; the client is seeking advice about past conduct. Discussing a crime the client is currently committing or planning is not. Courts look at the client’s intent at the time of the communication.
The Exceptions Under Rule 1.6(b)
Confidentiality has its own escape hatches. Rule 1.6(b) sets out seven narrow situations where a lawyer may reveal client information. Each requires the lawyer to reasonably believe the disclosure is necessary, and under the ABA model none of them force the lawyer’s hand — they are permissions, not commands. State versions can be stricter.
- To prevent reasonably certain death or substantial bodily harm.
- To prevent a client from committing a crime or fraud that will cause substantial financial injury to someone else, where the client is using or has used the lawyer’s services to do it.
- To mitigate or rectify substantial financial injury already caused by such a crime or fraud involving the lawyer’s services.
- To get ethics advice about the lawyer’s own compliance with the rules.
- To defend against a malpractice claim, bar complaint, or criminal charge related to the representation.
- To comply with a court order or other law.
- To detect and resolve conflicts of interest when a lawyer changes firms, and only to the extent the information does not compromise privilege or otherwise harm the client.
These are read strictly. A lawyer who misjudges the situation and discloses without adequate justification faces the same disciplinary exposure as one who disclosed for no reason at all.
How Long Each Protection Lasts
Both survive the end of the attorney-client relationship. The duty of confidentiality continues after the representation terminates, as confirmed by Comment 20 to Rule 1.6 and by Rule 1.9(c), which prohibits using a former client’s information to their disadvantage.6American Bar Association. Rule 1.6 Confidentiality of Information – Comment
Privilege goes further. It survives the client’s death. In Swidler & Berlin v. United States, the Supreme Court held that privilege remains intact after a client dies, rejecting the argument that courts should balance the deceased client’s interest against the need for the information. Clients must be able to communicate “fully and frankly with counsel” knowing their disclosures will remain confidential even after death.7Legal Information Institute. Swidler and Berlin v. United States After death, the privilege is generally asserted or waived by the client’s estate or personal representative.
Why the Difference Matters
The two protections carry different consequences when they fail.
Breaching the duty of confidentiality is a professional discipline problem. It goes to the state bar. Sanctions range from private reprimand for minor or inadvertent violations to suspension and disbarment for deliberate or egregious breaches. A confidentiality breach can also support a civil malpractice claim if the disclosure causes financial harm.
Failing to assert privilege is a case problem first. Because privilege is an evidentiary rule, the immediate consequence of not asserting it properly is that protected information enters the court record and can damage the client’s position. That failure can then become the basis for a malpractice claim or a disciplinary complaint on top of it. In some circumstances, improperly disclosed privileged material may be subject to sanctions or exclusion orders from the court.
For the client, the distinction is worth understanding before problems arise. A lawyer’s silence in a social setting is confidentiality at work. A lawyer’s refusal to testify or produce documents in a lawsuit is privilege at work. Information can be protected in one setting and exposed in another, and knowing which rule applies is what tells you whether a piece of information is actually safe.