A civil union is a legal relationship created by state law that gives two partners most of the same rights and responsibilities as a married couple within that state, but carries no recognition from the federal government. That split is the whole story of what a civil union means in a relationship: your state treats you as spouses for inheritance, healthcare decisions, and family law, while federal agencies treat you as legal strangers. Before entering one, it helps to know exactly which protections you gain and which you give up by choosing this status instead of marriage.
What You Get Inside Your State
Within a state that recognizes it, a civil union generally puts you on the same legal footing as a married spouse. State statutes typically say that a civil union partner is included in any legal definition of “spouse,” “family,” “next of kin,” or “dependent.” That broad language carries real weight in day-to-day life.
Inheritance is one of the clearest examples. If your partner dies without a will, you inherit under your state’s intestacy laws the same way a surviving spouse would. You can hold property together with rights of survivorship so it passes directly to you instead of going through probate. In most civil union states you can also file joint state income tax returns, and your partner’s employer-sponsored health plan can cover you as a dependent.
Healthcare decision-making follows automatically. If your partner is incapacitated, you have authority to make medical decisions, visit them in the hospital, and direct end-of-life care. Without a civil union or marriage, you would need a separate healthcare power of attorney, and even then you could face pushback from family members.
Parental rights are part of the package too. Partners can pursue joint adoption, and the law addresses custody, parenting time, and child support if the relationship ends. During the union, each partner carries a mutual support obligation similar to what spouses owe each other.
What You Don’t Get From the Federal Government
Federal law does not treat a civil union as a marriage. The 2022 Respect for Marriage Act did not change that; it defines marriage for federal purposes as a union “valid in the State where the marriage was entered into,” which by its terms excludes a civil union.1Congress.gov. H.R.8404 – Respect for Marriage Act – Text The practical consequences reach into most of the big federal programs couples rely on.
Federal Taxes
You cannot file a federal return as married filing jointly or married filing separately. The IRS states plainly that registered domestic partners and individuals in civil unions “are not married for federal tax purposes.”2Internal Revenue Service. Answers to Frequently Asked Questions for Registered Domestic Partners and Individuals in Civil Unions Each partner files as single, or as head of household if they qualify.
Social Security
Married spouses can claim benefits based on their partner’s earnings record, including spousal benefits in retirement and survivor benefits after a death, and generally need to have been married for at least one year to qualify.3Social Security Administration. What Are the Marriage Requirements to Receive Social Security Spouse’s Benefits? The Social Security Administration has indicated that some same-sex couples in non-marital legal relationships like civil unions may qualify for spousal or survivor benefits if they meet certain requirements.4Social Security Administration. Do I Qualify for Benefits as a Spouse if I Am Now in, or the Surviving Member of, a Non-Marital Legal Relationship? If you’re in a civil union, contact SSA directly rather than assuming you’re shut out.
Immigration
U.S. Citizenship and Immigration Services does not treat civil unions as marriages. Its policy manual lists “civil unions, domestic partnerships, or other such relationships not recognized as marriages in the place of celebration” among the relationships it will not recognize as marriages.5U.S. Citizenship and Immigration Services. USCIS Policy Manual – Marriage and Marital Union for Naturalization A U.S. citizen in a civil union cannot sponsor a non-citizen partner for a green card the way a married citizen can.6U.S. Citizenship and Immigration Services. Bringing Spouses to Live in the United States as Permanent Residents
Workplace Leave and Retirement Plans
The federal Family and Medical Leave Act gives eligible employees up to 12 weeks of unpaid, job-protected leave to care for a spouse with a serious health condition. FMLA defines “spouse” as a husband or wife in a marriage recognized under state law, which does not include a civil union partner.7eCFR. 29 CFR 825.102 – Definitions If your partner has a medical crisis, you have no federally protected right to take leave.
Private retirement plans governed by ERISA raise the same problem. The Department of Labor has stated that terms like “spouse” and “marriage” under federal benefits law “do not include individuals in a formal relationship recognized by a state that is not denominated a marriage under state law, such as a domestic partnership or a civil union.” Without spousal status under ERISA, you have no automatic right to a survivor annuity from your partner’s pension, and dividing retirement assets at the end of a relationship becomes harder.
Bankruptcy
Federal bankruptcy law lets a person and their spouse file a joint petition, which can cut costs and simplify the process. Because the Bankruptcy Code uses “spouse” to mean a married partner, civil union partners file separately and each pays their own fees.
How It Compares to Marriage
Inside your state, a civil union and a marriage look almost identical in what they provide. The difference is what happens the moment a federal agency, a federal statute, or another state’s law gets involved. A marriage carries over a thousand federal rights and obligations and is recognized in every state. A civil union carries none of them and may be ignored the moment you cross a state line.
Portability is the second major gap. A civil union formed in Colorado may mean nothing in Texas or Florida. No federal law requires other states to recognize another state’s civil unions, and most states have never passed civil union statutes. Courts have generally used choice-of-law principles rather than the Full Faith and Credit Clause to decide whether to honor an out-of-state relationship, and a state can refuse recognition if the relationship conflicts with its public policy.
Civil Union vs. Domestic Partnership
The two terms often get used interchangeably, and they shouldn’t be. A civil union typically carries the full package of spousal rights and obligations under state law. A domestic partnership varies much more widely. California’s registered domestic partnership provides the same rights as marriage under state law. Maine’s offers only a short list, like intestate succession and the right to make funeral arrangements. The label matters less than the specific statute, so read what your state actually grants rather than relying on the name.
Where You Can Still Enter One
Civil unions came into American law as an alternative for same-sex couples before marriage equality.8Justia. Obergefell v. Hodges, 576 U.S. 644 (2015) After nationwide marriage equality, several states that had offered civil unions converted them into marriages and stopped issuing new ones. Today a small group of states still has civil union statutes, including Colorado, Hawaii, Illinois, and Vermont. Vermont’s law limits civil unions to same-sex couples. Colorado, Hawaii, and Illinois allow both same-sex and opposite-sex couples to enter one. Every state that still issues civil unions also allows same-sex marriage, so the civil union now sits alongside marriage as a parallel option rather than the only route.
Why Some Couples Still Choose One
With marriage legal everywhere, choosing a civil union means voluntarily giving up federal benefits. Couples who do it usually have personal reasons. Some object to the institution of marriage on philosophical or political grounds but still want legal protection for the relationship. Others come from religious backgrounds where the word “marriage” carries meaning they don’t want to adopt. For opposite-sex couples in Colorado, Hawaii, or Illinois, a civil union is a way to formalize a partnership with legal safeguards while deliberately staying outside the marriage framework.
Occasional financial considerations come up as well. Because civil union partners file federal taxes as single individuals, some high-earning couples may avoid the marriage penalty that can raise a married couple’s combined federal tax bill. The loss of Social Security spousal benefits, FMLA protection, and retirement plan rights almost always outweighs that advantage, so run the numbers with a tax professional before deciding on this basis.
Ending a Civil Union
A civil union does not quietly expire if the relationship ends. Dissolution works much like divorce. One or both partners file a petition with the family court, and the court divides property and debts, decides whether one partner owes the other financial support, and handles custody and child support for any children. If both partners agree on every issue, they can file jointly and move through the process relatively quickly. When they disagree, a judge decides the contested matters after hearing evidence.
Residency is where this gets dangerous. Most states require you to live there before their courts will dissolve a relationship, and a state that doesn’t recognize your civil union has no legal framework to dissolve it. Couples who move can end up unable to dissolve the union where they live and unable to easily return to the state where they formed it. Several issuing states have addressed this directly. Colorado and Illinois provide that anyone who enters a civil union there consents to the jurisdiction of their courts for dissolution purposes, even if neither partner still lives in the state. Hawaii has a similar provision for couples who cannot dissolve their union where they currently reside. If you formed a civil union and later moved, check whether the issuing state offers this kind of fallback before assuming you’ll have to reestablish residency.