A husband and wife can testify against each other, but in a federal criminal case the witness-spouse gets to decide. The government cannot force one spouse to take the stand against the other, and the defendant-spouse cannot stop a willing partner from testifying. A separate rule, the marital communications privilege, lets either spouse block disclosure of private conversations they had during the marriage, and that one applies in civil cases too. Both protections have real exceptions.
The Right to Refuse the Witness Stand
In a federal criminal prosecution, the spouse called to testify holds the choice. The Supreme Court settled this in Trammel v. United States (1980), holding that “the witness-spouse alone has a privilege to refuse to testify adversely; the witness may be neither compelled to testify nor foreclosed from testifying.”1Justia Law. Trammel v. United States, 445 US 40 (1980) The Court’s reasoning was that when one spouse is willing to testify against the other, “their relationship is almost certainly in disrepair; there is probably little in the way of marital harmony for the privilege to preserve.”2Legal Information Institute. Trammel v. United States, 445 US 40
This testimonial privilege is broad. It covers anything the witness-spouse might say against the defendant, not just private conversations. A wife could refuse to describe what she personally saw her husband do, even when no confidential communication is at issue. But the privilege comes with hard edges:
- It applies only in criminal cases. Civil lawsuits are different.
- It requires a legally valid, current marriage. Once a divorce is final, the testimonial privilege disappears.
- The witness decides, not the defendant. Under federal law, the defendant-spouse cannot gag a willing witness.
State courts run on their own evidence rules. Some follow the federal approach from Trammel. Others still let the defendant-spouse block the testimony. If the case is in state court, the answer depends entirely on that state’s code.
The Right to Keep Private Conversations Private
The second protection, the marital communications privilege, covers only confidential communications made between spouses during the marriage. Private talks, letters, and messages that one spouse intended only for the other. Either spouse can invoke it to block disclosure of a protected conversation, and it applies in both civil and criminal proceedings.
Timing works differently here. This privilege survives divorce and even the death of a spouse. A conversation from 2020 remains privileged after a 2025 divorce. What it does not cover is anything said before the wedding or after the divorce decree.
To qualify, the communication has to have been intended as private. In Wolfle v. United States, the Supreme Court held that “the privilege suppresses relevant testimony, and should be allowed only when it is plain that marital confidence cannot otherwise reasonably be preserved.”3Legal Information Institute. Wolfle v. United States, 291 US 7
Email, Text, and Shared Devices
Courts have applied the communications privilege to electronic messages, but the confidentiality requirement causes problems that spoken conversations rarely raise. A private text between spouses on personal phones generally qualifies. The same conversation on a work email account may not. In United States v. Hamilton, the Fourth Circuit held that a husband who used his employer’s email system to write to his wife waived the privilege because the employer’s policy permitted inspection of stored messages. The court noted that the husband “did not take any steps to protect the e-mails in question, even after he was on notice of his employer’s policy.”
The same reasoning reaches other everyday scenarios. Messages on a shared family computer that children or others can access may not carry the expectation of privacy the privilege demands. Group chats that include anyone besides the two spouses are not privileged. If a conversation was not meant to be private, or the speaker should have known someone else could capture it, the privilege is at risk.4U.S. Department of Justice. Marital Privilege Outline and Chart
When Neither Privilege Applies
Several situations strip away one or both protections.
Crimes Against the Spouse or Their Children
Neither privilege applies when one spouse is charged with a crime against the other spouse or against either spouse’s children.4U.S. Department of Justice. Marital Privilege Outline and Chart In a domestic violence prosecution, the accused spouse cannot prevent the victim from testifying. In a child abuse case, the non-accused parent can be compelled to describe what they saw or heard. The privilege exists to protect marriages, not to shield a spouse who is harming the family.
Conversations About Crime or Fraud
Private conversations lose their protection when they involve planning or carrying out a crime or fraud. Communications “relating to present or future crimes are not privileged.”4U.S. Department of Justice. Marital Privilege Outline and Chart Spouses coordinating how to hide income from the IRS or run an insurance scheme cannot use the privilege to keep those talks out of evidence.
Spouses Suing Each Other
When spouses are on opposite sides of a lawsuit, most commonly in divorce, custody, property, or protective order proceedings, neither privilege applies. There is no marital harmony left for the rule to preserve.
Joint Criminal Activity
Some federal circuits recognize a “joint participation” exception to the testimonial privilege where both spouses are allegedly part of the same criminal scheme. It is not universally accepted. The Second and Third Circuits have rejected it. Whether it applies depends on the court hearing the case.
Civil Cases
The testimonial privilege, the right to refuse to take the stand at all, does not apply in civil litigation. If your spouse is a party to a business dispute, an injury claim, or a contract case, you can be subpoenaed and required to testify about what you observed. The communications privilege, however, generally still protects what your spouse privately told you. You might have to describe transactions you witnessed while refusing to reveal what your spouse confided about them.
Federal Rule of Evidence 501 adds one wrinkle: in federal civil cases where state law controls the underlying claim, the state’s privilege rules apply instead of federal common law.5United States Courts. Federal Rules of Evidence A diversity case involving a state-law claim would use that state’s spousal privilege rules.
Marriages That Don’t Qualify
Both privileges require a legally valid marriage. Unmarried couples who live together get no spousal privilege, no matter how long they have been together. Common-law marriages qualify where a state recognizes them, but the spouse asserting the privilege has to establish that the marriage meets that state’s requirements. Federal courts look to state law to decide whether a valid marriage exists.
A void marriage, one that was never legally valid, such as a bigamous or incestuous one, provides no basis for the privilege at all. A voidable marriage is treated as valid until a court declares it invalid, so communications made during it before annulment typically remain protected.
Separation without divorce is a gray area. The testimonial privilege technically lasts as long as the marriage is legally intact, though a court may treat a long separation as evidence that no harmony remains to protect. The communications privilege is more durable here because it protects conversations that were confidential when they happened, regardless of what came later.
How You Can Lose the Protection
Privileges are rights, and rights can be given up.
Testimonial privilege waives simply. The witness-spouse decides to testify. Once that choice is made voluntarily and knowingly, the defendant-spouse cannot block it.1Justia Law. Trammel v. United States, 445 US 40 (1980)
The communications privilege waives most often by disclosure. If you tell a friend, a relative, or the internet what your spouse said to you privately, the confidentiality is broken and the privilege for that conversation is gone. It cannot be restored.
A third party present during the original conversation can prevent the privilege from ever attaching. The Supreme Court noted in Wolfle that conversations made “in the presence of their children, old enough to comprehend them, or other members of the family within the intimacy of the family circle” are generally not privileged.3Legal Information Institute. Wolfle v. United States, 291 US 7 Dinner-table talk with teenagers listening likely never had protection to begin with.
Inadvertent waiver is real. Sensitive matters discussed in a restaurant, on speakerphone in a shared office, or anywhere a reasonable person could overhear may fall outside the privilege because they were not truly private.
If You’re Subpoenaed to Testify Against Your Spouse
Do not ignore the subpoena. It is a court order, and failing to appear can lead to contempt charges regardless of any privilege you hold.
Talk to a lawyer right away, and ideally not the one representing your spouse. Your interests may not line up with theirs. A separate attorney can tell you whether the testimonial privilege applies in your jurisdiction, whether the communications privilege covers specific questions you might face, and whether any exception overrides both.
If the testimonial privilege applies and you plan to invoke it, you assert it through proper channels: your attorney can file a motion or raise the privilege at the proceeding. You still appear. For questions that touch on confidential marital communications, either you or your spouse can invoke the communications privilege, again in front of the judge.
The privilege may protect you from some questions but not others. You might have to testify about what you personally observed while refusing to answer questions about what your spouse told you in private. Sorting those lines out before you take the stand is exactly what your lawyer is for.