Attorney-client privilege: what it protects

Attorney-client privilege lets you keep certain communications with your lawyer out of the hands of an opposing party. The key word is certain: it protects confidential communications made for the purpose of seeking or giving legal advice, and it does not automatically cover every email, fact, or document just because a lawyer is somewhere in the chain.

What is actually protected

As the Legal Information Institute explains, the privilege covers confidential communications between a lawyer and client that relate to the client’s seeking of legal advice or services, across conversations, letters, emails, and messages. It protects the communication, not the underlying facts — you cannot shield a fact from disclosure simply by telling it to your lawyer. Communications about ordinary, non-legal business are generally not privileged at all.

The privilege belongs to the client

The privilege is the client’s to invoke or waive, and it can be raised against a discovery request, a subpoena, or questions at a deposition. But adding a lawyer as a recipient, or copying counsel on a message, does not by itself make an otherwise ordinary communication privileged; the communication still has to be about legal advice and kept confidential.

How it can be waived

Confidentiality is fragile. If an unnecessary third party takes part in the communication, the protection can be lost — though someone essential to the representation, such as an interpreter, may not break it. Forwarding a privileged email to an outside friend for a second opinion is the kind of step that can waive protection. For a disclosure made in a federal proceeding or to a federal office or agency, Federal Rule of Evidence 502(b) provides that an inadvertent disclosure does not waive privilege or work-product protection if the holder took reasonable steps to prevent disclosure and promptly took reasonable steps to rectify it. Disclosures made in state proceedings require a separate analysis under Rule 502(c) and applicable state law.

Exceptions and limits

The privilege is not absolute. It does not apply when a client seeks a lawyer’s help to commit a crime or fraud. Other exceptions and limits are jurisdiction-specific; do not assume a communication is unprotected without checking the governing law. Privilege is also different from a lawyer’s duty of confidentiality (an ethics obligation that is broader) and from the work-product doctrine (which protects materials prepared for litigation). And it does not guarantee that everything, such as billing records, is categorically protected.

Hypothetical example

Imagine a small-business owner emails their lawyer to ask how to respond to a demand letter — that request for legal advice, kept confidential, is the kind of thing privilege is meant to protect. If the owner then forwards the lawyer’s reply to a supplier to prove a point, that voluntary sharing with an outside party could waive the privilege for that communication. This scenario is illustrative only.

A short checklist

Is it legal advice? The communication should be for seeking or giving legal advice, not general business talk.
Is it confidential? Keep it between you and your lawyer (and anyone essential to the representation).
Who else is on it? Extra recipients or forwarding can waive protection.
Facts vs. communications. Privilege covers the communication, not the underlying facts.
Which rules apply? State and federal privilege rules differ; check the ones that govern your matter.

This is general legal information, not legal advice, and it does not create a lawyer–client relationship; privilege rules and their exceptions vary between the states and federal court, so consult a lawyer about how they apply to your situation.