If you want the legal protections of marriage without a license or ceremony, the main legal alternatives to marriage are common law marriage, domestic partnerships, civil unions, and cohabitation agreements. Each covers a different slice of what marriage does, and none of them fully replaces a legal spouse at the federal level. Choosing well means matching the option to the protections you actually need.
One boundary to set at the start: only a legally recognized marriage, including a valid common law marriage, makes you a spouse in the eyes of the federal government. Domestic partnerships and civil unions do not, no matter how comprehensive they look on the state side.
Common Law Marriage
Common law marriage is the closest thing to being married without a wedding. Once established, it carries the same legal weight as a ceremonial marriage: joint tax filing, inheritance rights, spousal benefits, all of it. The trade-off is that only about a dozen jurisdictions still let you form one.
Where You Can Still Form One
The states that currently allow new common law marriages are Colorado, Iowa, Kansas, Montana, Oklahoma, Rhode Island, South Carolina, Texas, Utah, and the District of Columbia.1National Conference of State Legislatures. Common Law Marriage by State New Hampshire is a partial case: a couple who lived together and held themselves out as married for at least three years is treated as legally married only after one partner dies, and only for inheritance.2Legal Information Institute. Common Law Marriage In Rhode Island and Oklahoma, the doctrine lives in court decisions rather than in a statute.
Some states that no longer allow new common law marriages will still recognize the ones formed before their cutoffs: Alabama through January 1, 2017; Georgia through January 1, 1997; Pennsylvania through January 1, 2005; Ohio through October 10, 1991; and Idaho through January 1, 1996.1National Conference of State Legislatures. Common Law Marriage by State
What It Takes to Establish One
Three elements have to line up: both partners presently agree they are married (not that they plan to be someday), they live together, and they hold themselves out to the community as spouses.2Legal Information Institute. Common Law Marriage “Holding out” is where most fights happen. It means you consistently present yourselves as married: using the same last name, calling each other spouses in front of others, filing joint tax returns, listing each other on insurance. Telling some people you are married while telling others you are not undermines the claim.
No specific number of years is required. Courts weigh the whole record rather than counting months. Useful evidence includes joint bank accounts, shared property deeds, insurance policies naming your partner as a spouse, and testimony from people who understood you to be married.
Portability and Ending It
A valid common law marriage travels. Under the Full Faith and Credit Clause, other states must honor it even if they do not allow new common law marriages themselves.3Legal Information Institute. Common Law Marriage A couple who establishes one in Colorado and moves to California is still legally married.
Ending one works the same as ending any marriage: you file for divorce. Moving apart does not dissolve it. That surprises people who assume that because no license was involved, no formal process is needed to separate. Property division and any support obligations run just like any other divorce.
Domestic Partnerships and Civil Unions
Domestic partnerships and civil unions are government-created statuses that give unmarried couples some or all of the state-level rights of marriage. What you actually get varies a lot by jurisdiction, and neither status counts as marriage federally.
How Domestic Partnerships Work
You register a domestic partnership through a state, county, or city office. Some states run a statewide registry with broad rights; other places offer only a limited local registry mostly used to enroll a partner in employer health benefits. Common eligibility rules require both partners to be at least 18, unmarried and not in another partnership, unrelated by close blood, and sharing a residence. Some jurisdictions add a cohabitation period or proof of shared finances.
Registration usually means filling out a declaration or affidavit, providing ID and proof of a shared address, signing before a notary, and paying a filing fee that generally runs from about $10 to $40. It is not effective until the office processes the paperwork and issues a certificate.
What you get depends entirely on where you register. California, Oregon, and Nevada extend rights that closely mirror marriage at the state level, including community property protections and hospital visitation. In many cities and counties, the registry does little more than let you onto a partner’s employer health plan. Check the specific rules where you live before assuming you have any given right.
Civil Unions
A small number of states offer civil unions as a distinct status. Illinois, Hawaii, and Vermont give civil union partners the same state-level rights, obligations, and protections as spouses.4National Conference of State Legislatures. Civil Unions and Domestic Partnership Statutes Where a full-strength civil union exists, the practical difference from marriage is almost entirely federal. The state treats you as spouses for inheritance, medical decisions, and state taxes. The federal government does not.
The Portability Problem
Unlike common law marriages, domestic partnerships and civil unions do not travel reliably. If you register in one state and move to a state with no equivalent framework, your protections may vanish. Virginia, for example, explicitly does not recognize domestic partnerships formed elsewhere. Research your destination before relocating.
Cohabitation Agreements
A cohabitation agreement is a private contract between unmarried partners. It does not create a legal status or change how the government sees your relationship. It creates enforceable rules between the two of you, which matters because married couples have default state rules for splitting assets and unmarried couples do not.
What to Cover
A solid agreement addresses:
- Property ownership: what each of you brought in, and how new purchases are split.
- Shared expenses: how rent, utilities, groceries, and repairs are divided.
- Debt: who is liable for existing debts and any taken on during the relationship.
- Separation terms: how property and joint accounts get divided if you split, including who stays in a shared home.
- Support: whether either partner will provide financial support to the other after separation.
If you have children together, the agreement can address expectations around custody and financial support, but courts always retain authority to override private terms on child-related matters based on the child’s best interests.
Making It Stick
Put it in writing and sign voluntarily. Oral agreements between unmarried couples are hard to prove and harder to enforce. Notarization is not always legally required, but it strengthens enforceability by creating an independent record that the signatures are authentic. Notary fees are modest, typically $5 to $10 per signature.
Each partner should have their own attorney review the agreement before signing. That is one of the factors courts look at when deciding whether to enforce it. Agreements where one partner had counsel and the other did not, or where one partner was rushed into signing, are more vulnerable to being thrown out. Courts also will not enforce any provision that amounts to an exchange for sexual services.
Without a written agreement, the outcome depends on your state. Most keep each partner’s separate property in their own hands and leave you to fight over anything jointly held. Some states allow claims based on an implied or oral agreement if one partner can show they gave up career opportunities or contributed heavily in reliance on promises from the other. Those claims are expensive and hard to win.
Federal Benefits None of These Options Deliver
This is where every non-marriage arrangement runs into the same wall. Unless you have a valid common law marriage recognized by your state, the federal system treats you as single.
Federal Taxes
Registered domestic partners and civil union partners cannot file federal returns as married filing jointly or separately. The IRS treats them as unmarried regardless of what the state calls the relationship.5Internal Revenue Service. Answers to Frequently Asked Questions for Registered Domestic Partners and Individuals in Civil Unions With a recognized common law marriage, you are married for federal tax purposes and can file jointly.6Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information
Employer Health Insurance
When an employer pays for a legal spouse’s premiums, that contribution is excluded from the employee’s taxable income.7eCFR. 26 CFR 1.106-1 – Contributions by Employer to Accident and Health Plans When the employer pays for a domestic partner’s premiums, that contribution is taxable income to the employee unless the partner qualifies as a tax dependent. This “imputed income” can add hundreds or thousands of dollars to an annual tax bill. Your own premium contributions for a partner also come out post-tax, while spousal contributions come out pre-tax. Many couples discover this on their first paycheck after enrollment.
Social Security
Social Security survivor and spousal benefits generally go only to legal spouses, including recognized common law spouses.8Social Security Administration. 20 CFR 404.726 – Evidence of Common-Law Marriage A domestic partner typically has no claim on a deceased partner’s Social Security regardless of how long or how financially entangled the relationship was.
Immigration
You cannot sponsor a domestic partner for an immigration visa. USCIS explicitly lists domestic partnerships among the relationships it does not treat as marriages.9U.S. Citizenship and Immigration Services. USCIS Policy Manual Volume 6, Part B, Chapter 6 – Spouses Only a legal spouse qualifies for a spousal petition. If a couple’s immigration strategy depends on sponsorship, actual marriage is the only route.
Family and Medical Leave
The Family and Medical Leave Act defines “spouse” as a husband or wife recognized under state law, including common law spouses. Domestic partners and civil union partners are not spouses under the FMLA.10U.S. Department of Labor. Fact Sheet 28L – Leave Under the Family and Medical Leave Act When You and Your Spouse Work for the Same Employer There is no federally protected right to take unpaid leave to care for a seriously ill domestic partner.
Filling the Gaps With Estate and Medical Documents
Married couples get a package of default protections when a spouse dies or becomes incapacitated. Unmarried couples get none of those defaults no matter how long they have been together. The only way to close the gap is to build the protections through legal documents.
The Default Rule Is Blood, Not Love
If your partner dies without a will, intestate succession decides who inherits. Every state’s intestate rules prioritize spouses, children, parents, and siblings. Unmarried partners are not in that list. Twenty shared years, a joint mortgage, children raised together, none of it changes the result. Without a will, an unmarried partner takes nothing and has no standing to contest the distribution.
Documents Every Unmarried Couple Should Have
- A will that names your partner as a beneficiary and specifies what they receive. Without one, your assets follow intestate succession to blood relatives.
- A healthcare power of attorney designating your partner to make medical decisions if you cannot. Without it, that authority defaults to your closest blood relatives, who are under no obligation to consult your partner.
- Updated beneficiary designations on retirement accounts, life insurance, and payable-on-death bank accounts. These pass to whoever is named, bypassing the will. An unchanged designation naming a parent or ex overrides your written wishes.
- A revocable living trust to transfer property immediately at death without probate. Especially useful when family members might challenge a will.
A financial power of attorney is also worth considering. It lets your partner manage bank accounts, pay bills, and handle financial matters if you cannot.
Hospital Visitation
Federal rules require every hospital that participates in Medicare or Medicaid to let patients choose who visits, whether spouse, partner, or someone with no family tie at all.11Centers for Medicare and Medicaid Services. Medicare Steps Up Enforcement of Equal Visitation and Representation Rights in Hospitals Those rules also support a patient’s right to designate anyone, including an unmarried partner, to make medical decisions. A healthcare power of attorney locks that designation in before an emergency, because a patient who is already incapacitated cannot make the designation.
Parental Rights
Married couples get an automatic presumption that both spouses are legal parents of a child born during the marriage. Unmarried couples do not. An unmarried father who has not established legal parentage has no custody rights, no right to visitation, and cannot block an adoption or foster placement.
Parentage is usually established one of two ways: signing a voluntary acknowledgment of parentage at the hospital shortly after birth, or getting a court order.12eCFR. 45 CFR 303.5 – Establishment of Paternity Federal law requires every state to run a voluntary paternity establishment program at all birthing hospitals, where both parents receive the forms, hear the legal consequences, and get the chance to sign. Both signatures must be notarized or witnessed. If paternity is disputed, either party can request genetic testing through the state’s child support enforcement agency. Handling the acknowledgment at the hospital, when both parents are present and in agreement, is the cheapest path; putting it off adds legal expense and delay that compound if the relationship later breaks down.