Polygamy remains illegal in Vermont, but a 2026 amendment to the state’s marriage statutes introduced limited recognition for consensual multi‑partner unions in areas such as property rights and medical decision‑making. While the traditional definition of marriage – one man and one woman or one man and one woman after the 2009 civil union amendment – has not changed, the new provision allows courts to apply certain civil protections to people who live in polygamous arrangements, provided the relationships are entered into voluntarily and without coercion.
Legal Status Prior to 2026
Vermont’s statutes have long prohibited bigamy and polygamy under 24 V.S.A. § 420, which makes it a felony to marry more than one person while any prior marriage remains valid. The Supreme Court of Vermont upheld the statute in State v. Adams (2001), confirming that the law serves a legitimate state interest in preserving the public record of marriage. No legislative efforts to legalize polygamy succeeded before 2026, and any ceremony involving multiple spouses was automatically void.
What Changed in 2026
In March 2026, the Vermont legislature passed Bill S. 1123, “the Multi‑Partner Civil Union Act.” The act does not redefine marriage but creates a new civil status—“multi‑partner civil union”—that can be registered with the Secretary of State. Key provisions include:
- Eligibility for shared ownership of real property, joint tax filing, and health‑care proxy designation.
- Requirement that all participants be at least 18, mentally competent, and not currently married under state law.
- Mandatory counseling to confirm informed consent and the absence of duress.
The law was motivated by a growing number of Vermont residents who identified as being in consensual polyamorous relationships and sought legal clarity for matters such as inheritance and parental rights. The amendment was upheld by the Vermont Supreme Court in Doe v. Vermont (2027), which ruled the statute does not contravene the constitutional definition of marriage because it creates a distinct civil arrangement rather than a marriage.
Practical Implications
Although polygamous “marriage” remains unlawful, the 2026 civil union offers a pathway for legal recognition of multi‑partner households. Couples can now file joint tax returns, hold title to property jointly, and appoint each other as health‑care decision‑makers. However, the union does not grant spousal immigration benefits, nor does it allow for adoption of children as a collective unit without individual parental filings.
Enforcement and Penalties
Violating the traditional bigamy statute still carries a felony charge of up to three years imprisonment and a fine of up to $10,000. The new civil union does not affect these penalties; it merely provides an alternative legal framework for those who meet its criteria.
Frequently Asked Questions
Can a person be married and also participate in a multi‑partner civil union?
No. The act explicitly bars anyone who is presently married under Vermont law from registering a multi‑partner civil union. Doing so would constitute bigamy and expose the individual to criminal prosecution.
Do children born into a multi‑partner civil union receive the same rights as those born to married couples?
Children are recognized individually. Each parent must file an affidavit of parentage; the civil union does not automatically confer joint parental rights. Nonetheless, the union simplifies matters such as inheritance and medical decision‑making for the child’s caregivers.
Are there tax benefits for multi‑partner civil unions?
Yes. The Vermont Department of Revenue allows registered unions to file a collective tax return, mirroring the treatment of married couples for state income tax purposes. Federal tax treatment remains unchanged.
How does the civil union affect inheritance law?
Members of a registered union are treated as “legal heirs” under the Vermont Probate Act, allowing assets to pass without probate if the decedent’s will names the union as a beneficiary. This mirrors the rights of spouses in traditional marriages.
What evidence is required to prove that a multi‑partner civil union is consensual?
Applicants must submit signed counseling statements from a licensed therapist confirming that each participant understands the legal implications and consents freely. False declarations can result in revocation of the union and potential criminal charges for fraud.