Common Law Marriage in Massachusetts: Recognition and Alternatives

Common law marriage in Massachusetts is not recognized. No matter how long you live together, share finances, or introduce each other as spouses, you cannot become legally married in Massachusetts without a marriage license and a ceremony performed by an authorized officiant. The state does, however, recognize a common law marriage that was validly formed in another state that allows them.¹

That distinction — no creation inside the state, but recognition of one formed elsewhere — is the whole rule in a sentence. The rest is what it means for your rights and what you can do about it.

The Rule Inside Massachusetts

Cohabitation alone does not create a marital relationship in Massachusetts. The state resource on marriage puts it plainly: “Common-law marriage is not recognized in Massachusetts.”¹ A couple who moved in together decades ago, bought a home, raised children, and told everyone they were married has, in the eyes of Massachusetts law, no marriage at all if they never went through a formal ceremony.

The length of the relationship is irrelevant. Five years, fifty years — same result. Joint bank accounts, shared mortgages, hyphenated names, matching rings: none of it converts cohabitation into marriage. Only a solemnized ceremony under a valid license does that.

Common Law Marriages Formed in Other States

Massachusetts will honor a common law marriage that was validly established in a state that recognizes them.¹ Roughly a dozen states still allow some form of it as of 2025: Colorado, Iowa, Kansas, Montana, New Hampshire (for inheritance purposes only), South Carolina, Texas, and Utah do so by statute, while Rhode Island and Oklahoma recognize them through case law.² If you formed a valid common law marriage in one of those states before moving to Massachusetts, your marriage travels with you.

Proving It

Massachusetts courts don’t presume the marriage exists. You have to demonstrate that it was valid under the law of the state where it was formed, which means learning that state’s specific requirements and producing evidence you met them. Typical evidence includes joint tax returns filed as married, shared property deeds listing both partners as spouses, joint financial accounts, and testimony from friends and family confirming you held yourselves out publicly as married.

Time makes this harder. A couple who spent five years in Texas and twenty-five in Massachusetts may struggle to locate witnesses or records from the Texas period. Most claims fall apart on evidence, not on the underlying facts of the relationship. If you think you have a common law marriage from another state, gather the documentation now and keep it somewhere safe, not when you need it in probate court.

What Unmarried Couples Lose

The gap between being married and being long-term partners in Massachusetts is a concrete list of legal rights.

Inheritance

Under Massachusetts intestacy law, when someone dies without a will the estate passes first to a surviving spouse, then to children, parents, and siblings.³ An unmarried partner is not on that list. You could share a home for thirty years and inherit nothing when your partner dies. The property goes to their legal next of kin instead.

Medical Decisions

Without a signed health care proxy, an unmarried partner has no automatic right to make medical decisions. Hospitals may defer to blood relatives. Chapter 201D of the General Laws lets any competent adult appoint a health care agent, and that agent can be an unmarried partner, but only with the written document in place.⁴

Taxes

Unmarried couples cannot file federal tax returns jointly. The IRS has stated that registered domestic partners may not use married filing jointly or married filing separately status because they are not married under state law.⁵ Depending on your incomes, that can mean thousands of dollars a year in lost tax advantages.

Domestic Partnerships Are Not a Substitute

Some Massachusetts cities and towns register domestic partnerships, but these are local arrangements, not every municipality offers them, and they don’t carry the weight of a marriage.⁶ A partnership registered in Cambridge or Boston can unlock certain municipal benefits, but it does not give you inheritance rights, spousal privilege, equitable property division on a breakup, or joint federal tax filing. Treating it as interchangeable with marriage is one of the most common and costly mistakes long-term couples make.

How Unmarried Couples Can Protect Themselves

Most of what marriage provides automatically, unmarried couples can build for themselves through separate documents. It has to be done deliberately and in writing.

Cohabitation Agreement

Massachusetts courts recognize enforceable contracts between unmarried partners covering property, finances, and other aspects of the relationship. The Supreme Judicial Court confirmed this in Wilcox v. Trautz (1998), holding that cohabitation agreements are subject to ordinary contract law.⁶ A workable agreement addresses who owns which assets, how income and expenses will be shared, how newly acquired property will be titled, and how everything will be divided if the couple separates.

Health Care Proxy and Power of Attorney

Sign a health care proxy naming your partner as your agent. Under Chapter 201D, the agent you name can make any health care decision you could make yourself, including decisions about life-sustaining treatment.⁴ A separate durable power of attorney for finances lets your partner handle banking, insurance, and other financial matters if you become incapacitated. Without both documents, your partner is a legal stranger to the hospital and the bank.

Will and Beneficiary Designations

Because intestacy law shuts unmarried partners out entirely, a will naming your partner is essential rather than optional. Then check every beneficiary designation on retirement accounts, life insurance, and investment accounts. Those designations override a will in most cases, so an outdated form can quietly undo the rest of your estate plan.

Federal Benefits for a Valid Out-of-State Common Law Marriage

Federal agencies look to the state where the marriage was formed, not where the couple lives now. That means a valid common law marriage from a recognizing state can support federal claims even if the couple later moved to Massachusetts.

The Social Security Administration pays survivor benefits to a common law spouse when the marriage was established in a recognizing state. The surviving spouse submits a signed statement affirming the marriage (Form SSA-754-F5), along with statements from two blood relatives of the deceased spouse (Form SSA-753). Supporting evidence like joint tax returns, shared deeds, and beneficiary designations helps.⁷

The Office of Personnel Management applies the same principle to federal employee health benefits. A common law spouse can enroll in FEHB if the marriage was initiated in a recognizing state, with either a court order or a signed declaration plus documentation such as a joint tax return or proof of shared residency and finances.⁸

The burden of proof always falls on the person claiming the marriage. Massachusetts doesn’t need to authorize common law marriage for these federal benefits to reach you, but you will need the paperwork to show the marriage was valid where it began.

1
Mass.gov. Massachusetts Law About Marriage
2
National Conference of State Legislatures. Common Law Marriage by State
3
Mass.gov. Mass. General Laws c.190B 2-102
4
General Court of Massachusetts. Massachusetts General Laws Chapter 201D – Health Care Proxies
5
Internal Revenue Service. Answers to Frequently Asked Questions for Registered Domestic Partners and Individuals in Civil Unions
6
Mass.gov. Massachusetts Law About Unmarried Couples and Domestic Partnerships
7
Social Security Administration. Code of Federal Regulations 404.726 – Evidence of Common-Law Marriage
8
U.S. Office of Personnel Management. Common Law Spouse Eligibility Fact Sheet