Common law marriage in New Hampshire is not recognized during a couple’s lifetime. The state carves out only one narrow exception, found in RSA 457:39, which lets a probate court declare a couple to have been legally married after one partner dies, provided they lived together and were publicly known as married for at least three years. A separate statute, RSA 457:3, honors valid common law marriages that couples formed in other states before moving here. Everything else about unmarried life together — property, support, medical decisions, inheritance — turns on documents the couple puts in place, not on how long they lived as a couple.
The Death-Only Exception Under RSA 457:39
RSA 457:39 says two people are “deemed to have been legally married” if they cohabited, acknowledged each other as husband and wife, were generally reputed in their community to be married, and kept that arrangement going for at least three years up through one partner’s death.1New Hampshire General Court. New Hampshire Revised Statutes Section 457:39 – Cohabitation, etc. All four elements have to be there. A couple that lived together for ten years but stayed quiet about the relationship can fail the reputation element. A couple everyone treated as married can still fail the three-year clock.
Two more requirements come from case law and agency practice rather than the statute itself. Both partners must have been legally competent to marry each other for the whole three-year period, meaning neither was already married to someone else. And both must have been domiciled in New Hampshire during that time.2Social Security Administration. POMS PR 05005.032 – New Hampshire
The critical point that surprises many couples: none of this operates while both partners are alive. RSA 457:39 confers no rights, no obligations, and no legal status until a death triggers it. Its purpose is narrow — to give a surviving partner standing in probate and in benefit claims.
Couples Who Moved Here Already Married at Common Law
The picture changes entirely when a couple established a valid common law marriage in another state before relocating. Under RSA 457:3, a marriage lawfully contracted outside New Hampshire is recognized here, so long as it would not have been prohibited under state marriage law.3New Hampshire General Court. New Hampshire Revised Statutes Section 457:3 – Recognition of Out-of-State Marriages Recognition applies during both partners’ lifetimes, not only after death.
A couple who entered a valid common law marriage in Colorado, Kansas, Texas, or one of the other states that allow the arrangement is treated as legally married for every purpose once they become New Hampshire residents. Same property rights. Same inheritance protections. Same divorce requirements. Ending that marriage means a formal divorce through the New Hampshire courts, not just moving apart.
The question that decides these cases is whether the marriage actually met the originating state’s rules. Each state has its own test. If the couple cannot show they satisfied it, New Hampshire has no obligation to treat them as married.
Proving the Marriage in Probate Court
When a partner dies and the survivor wants recognition under RSA 457:39, the claim is raised in probate court, usually as part of a petition to administer the estate. The surviving partner has to prove all four elements: cohabitation, mutual acknowledgment, community reputation, and the three-year duration.
Judges look at the full picture. Joint tax returns, shared leases or mortgages, insurance policies naming the partner as a spouse, and legal documents that reference the relationship all carry weight. So does testimony from neighbors, coworkers, and family about how the couple presented themselves in public. The burden sits on the surviving partner, and judges have turned down claims where the evidence was thin or pulled in different directions.1New Hampshire General Court. New Hampshire Revised Statutes Section 457:39 – Cohabitation, etc.
These cases often go contested. Children from a prior marriage, siblings, or other heirs stand to lose part of the estate if the court recognizes the relationship, so they push back. Challengers may argue the couple never actually held themselves out as married, that the cohabitation broke up in the middle, or that the three-year period had not fully run. Contested cases can stretch on for months, and legal representation is close to essential.
What Is Actually at Stake: Intestacy
Recognition matters because New Hampshire’s intestacy law gives a surviving spouse a large share of the estate. Under RSA 561:1, if the deceased left no children or parents, the spouse takes everything. If there are children shared by both spouses and no others, the spouse gets the first $250,000 plus half the balance. If the deceased had children from another relationship, the spouse still receives the first $100,000 plus half the balance.4New Hampshire General Court. New Hampshire Revised Statutes Section 561:1 – Distribution Upon Intestacy
A surviving partner who cannot establish a 457:39 claim takes nothing under intestacy. The estate passes to blood relatives in a fixed order: children first, then parents, then siblings and their descendants.4New Hampshire General Court. New Hampshire Revised Statutes Section 561:1 – Distribution Upon Intestacy The difference can be the family home.
This is why estate planning matters more for unmarried couples than for married ones. A valid will can name a partner as a beneficiary regardless of marital status. A trust holds assets outside probate entirely and is harder to challenge. Naming a partner on life insurance, retirement accounts, and payable-on-death bank accounts moves those specific assets directly. Couples who treat RSA 457:39 as their only backstop are gambling that the survivor will clear every evidentiary hurdle after the fact.
Property Rights While Both Partners Are Alive
Because New Hampshire grants no marital status to unmarried couples during life, property rights come down to titling. No community property. No equitable distribution. No automatic claim on a partner’s assets.
Real estate follows the form of ownership. Joint tenancy with right of survivorship passes property automatically to the survivor without probate. Tenancy in common gives each partner a separate share that passes to their own heirs. A partner who paid toward a home but is not on the deed has an uphill fight, needing to bring a civil claim on theories like unjust enrichment or constructive trust and show the titled partner’s retention of full ownership would be unfair.
Bank accounts work the same way. Joint accounts let either partner draw. Individually held accounts stay with the account holder. Vehicles and valuables go to whoever can show ownership through title, receipts, or other records. Nothing is presumed shared.
Healthcare Decisions
New Hampshire law does something unusual here. Under RSA 137-J:35, when a patient cannot make medical decisions and has not named a healthcare agent, the state assigns surrogate authority in a priority order. A “common law spouse as defined by RSA 457:39” sits at the same priority level as a legal spouse, ahead of adult children, parents, and siblings.5New Hampshire General Court. New Hampshire Code 137-J:35 – Surrogate Decision-making
This is one of the few settings where the RSA 457:39 relationship has any real effect while both partners are still alive. The statute effectively asks whether the survivor would meet the 457:39 test if the patient died right then. Proving that in a hospital corridor is another matter, though, and a signed healthcare power of attorney sidesteps the question.
Social Security and Federal Benefits
The Social Security Administration applies state law when deciding whether a claimant is a surviving spouse. For New Hampshire, that means SSA evaluates the claim under RSA 457:39. If the survivor can show cohabitation, mutual acknowledgment, and community reputation for the full three-year period ending at the insured’s death, SSA will pay survivor benefits.6Social Security Administration. POMS PR 05605.032 – New Hampshire
SSA has denied claims where the three years did not add up. In one New Hampshire matter, the agency found the claimant could not be recognized as a common law spouse because the period during which the couple was legally competent to marry each other was shorter than three years at the death.6Social Security Administration. POMS PR 05605.032 – New Hampshire Couples with prior marriages need to count from the date the earlier marriage legally ended, not from when they started living together.
Federal employee health benefits use a different rule. The Office of Personnel Management requires that a common law marriage be “initiated in a state that recognizes common law marriages” for a spouse to qualify under the Federal Employees Health Benefits Program.7OPM. Family Member Eligibility Fact Sheet – Common Law Spouse A couple who formed the relationship in New Hampshire will not qualify. A couple who formed a valid common law marriage elsewhere and then moved here can.
Children and Parental Rights
Parentage runs on its own track, independent of marital status. New Hampshire presumes the birth mother is the legal parent, but an unmarried father has to establish paternity affirmatively. The easiest path is signing a voluntary acknowledgment of paternity at the hospital when the child is born. If paternity is disputed or was not established at birth, either parent can bring a court proceeding.8New Hampshire General Court. New Hampshire Code 5-C:24 – Affidavit of Paternity
Without legally established paternity, an unmarried father has no automatic right to custody, visitation, or decision-making. Once paternity is on the books, custody and support follow the framework in RSA 461-A that applies to divorced parents. Courts weigh the child’s best interests, and support is calculated under state income guidelines.9New Hampshire General Court. New Hampshire Revised Statutes Section 461-A:14 – Support None of this depends on whether the parents ever lived together or would have qualified under RSA 457:39.
Separating Without Divorce
When an unmarried couple splits, there is no divorce to file. No court proceeding divides assets or sets support the way a divorce would. Each person keeps what stands in their name, and shared property gets untangled through negotiation or civil litigation.
Alimony is off the table. New Hampshire law limits alimony to a “spouse or former spouse” and ties it to a divorce, annulment, or legal separation.10New Hampshire General Court. New Hampshire Revised Statutes Section 458:19 – Alimony There is no palimony equivalent. A partner who stepped back from a career to run a household or raise children has no statutory right to financial support after the split.
Where one partner paid toward a home, business, or other asset held in the other partner’s name, the contributing partner can bring a civil claim. These suits usually rest on contract principles like implied agreements to share the benefit of joint effort, or on unjust enrichment where one partner unfairly kept the full value of what both built. Courts want substantial evidence of the contributions and the understanding between the parties. Without records, these claims are hard to win.
A cohabitation agreement, drawn up before or during the relationship, heads off most of these disputes. It sets out who owns what, how shared expenses work, and how jointly acquired property gets divided if the couple splits. Putting the financial arrangement in writing early is the clearest path unmarried couples in New Hampshire have.