No. Domestic partnership is not only for gay couples. In the large majority of states and cities that still offer it, the registry is gender-neutral and open to any two adults who meet the basic eligibility rules. The registries were originally built to give same-sex couples legal recognition when marriage was closed to them, but after same-sex marriage became legal nationwide in 2015, most jurisdictions kept their registries open to everyone rather than shutting them down.
Who Can Register
The standard requirements look much the same from one jurisdiction to the next. Both partners have to be at least 18, mentally capable of consenting, and not already married or in another domestic partnership. They can’t be closely related by blood in a way that would prevent them from marrying. And they have to share a primary residence, though both names don’t need to appear on the lease or deed — living together in the same home is what the registry is looking for.
Sex is not on that list in most places. An opposite-sex couple who meets the age, residency, and single-status rules can register the same way a same-sex couple can.
The Senior-Only Exception
A handful of states have narrowed new registrations to couples where at least one partner is 62 or older. Washington is the clearest example: it converted most existing domestic partnerships into marriages in 2014 and now only accepts new registrations from senior couples.
The reason for the age cutoff is practical rather than symbolic. An older adult who remarries can lose Social Security survivor benefits or alimony tied to a prior marriage. Domestic partnership gives those couples legal recognition without triggering the loss. If you’re in a state with a senior-only registry and you’re under the age threshold, marriage is generally your only route to formal recognition there.
States Moving the Other Direction
California took the opposite approach. Its registry was originally limited to same-sex couples and to opposite-sex couples with at least one partner over 62. In 2020, the state removed the age requirement entirely, and the registry is now open to any two adults regardless of sex or age.1California Secretary of State. Domestic Partners Legislation That change tracks the broader shift: domestic partnership has moved from being a marriage substitute for same-sex couples to being a standalone option for anyone who wants legal recognition without a marriage certificate.
Why an Opposite-Sex Couple Might Choose It
For same-sex couples, domestic partnership used to be the only option. Now it’s a choice, and opposite-sex couples face the same choice when their state offers an open registry.
The senior rationale — preserving Social Security survivor benefits or alimony from a prior marriage — is the oldest reason. Beyond that, some couples simply want a defined legal relationship without the social, religious, or financial weight of marriage. A statewide registry typically carries a package of state-law rights that includes inheritance protections and healthcare decision-making authority. Nevada’s registry, for instance, grants domestic partners the same rights and obligations as any other civil contract under state law.2Nevada Secretary of State. Domestic Partnerships
Before choosing this route, both partners — whatever their sex — need to understand what the registry doesn’t do.
What Domestic Partnership Won’t Give You
The gaps are the same for same-sex and opposite-sex couples. The federal government does not treat registered domestic partners as spouses for any purpose, and that creates several concrete problems.
Federal Taxes
Domestic partners cannot file a joint federal income tax return. The IRS doesn’t consider registered domestic partners married regardless of what the state registry says. Each partner files as single, or as head of household if they have a qualifying dependent other than the partner — a domestic partner by themselves does not make someone eligible for head-of-household status. For higher-earning couples, this can mean thousands of dollars more in federal tax each year compared to a married couple in the same financial position. One modest upside: each partner can independently decide to itemize or take the standard deduction, a flexibility married couples don’t have.3Internal Revenue Service. Answers to Frequently Asked Questions for Registered Domestic Partners and Individuals in Civil Unions
Family and Medical Leave
The federal Family and Medical Leave Act lets eligible employees take up to 12 weeks of unpaid leave to care for a spouse with a serious health condition. Domestic partners don’t qualify. The Department of Labor’s definition of “spouse” covers legally married husbands and wives, including same-sex spouses and common-law marriages, but explicitly excludes individuals in domestic partnerships and civil unions.4U.S. Department of Labor. Fact Sheet #28L: Leave Under the Family and Medical Leave Act for Spouse Some state leave laws reach further, but the federal baseline doesn’t cover domestic partners.
Social Security and Immigration
Social Security spousal and survivor benefits are generally unavailable to domestic partners. The Social Security Administration notes that some same-sex couples in non-marital legal relationships may qualify under certain circumstances and encourages them to apply, but there’s no blanket entitlement comparable to what married spouses get.5Social Security Administration. Do I Qualify for Benefits as a Spouse if I Am Now in, or the Surviving Spouse of, a Civil Union, Domestic Partnership, or Other Non-Marital Legal Relationship? On the immigration side, a domestic partnership does not qualify a foreign partner for a family-based visa or green card. Federal immigration law defines “spouse” as a legally wedded husband or wife, and cohabiting or registering a domestic partnership does not meet that standard.6Travel.State.Gov. Immigrant Visa for a Spouse of a U.S. Citizen (IR1 or CR1)
Employer Health Coverage Comes With a Tax Hit
Many employers now extend health insurance to domestic partners. It sounds like a straightforward benefit until the tax bill arrives. Because the IRS doesn’t recognize domestic partners as spouses, the employer’s contribution toward the partner’s premium counts as taxable imputed income to the employee. That amount is added to gross income and is subject to federal income tax, state income tax, and FICA. The imputed amount is typically the difference between what the employer pays for employee-plus-partner coverage and what employee-only coverage would cost, often several hundred dollars a month.
There is one way out. If the domestic partner qualifies as the employee’s tax dependent under IRS rules, the coverage is excluded from income the way spousal coverage would be. Qualifying generally means the partner lives with the employee for the entire year, receives more than half their financial support from the employee, and earns less than the IRS gross income threshold for dependents. Most working partners won’t meet that test, so the imputed income is the norm. Married spouses, same-sex or opposite-sex, never face this issue.
It May Not Travel With You
There is no constitutional requirement that one state recognize a domestic partnership registered in another. The Full Faith and Credit Clause, which requires states to honor each other’s court judgments, doesn’t extend the same force to legal statuses like domestic partnerships; each state sets its own policy.7Constitution Center. Article IV, Section 1: Full Faith and Credit Clause If you register in one state and move to a state without a comparable registry, the protections can disappear. Marriage, by contrast, must be recognized in every state after the Supreme Court’s 2015 decision in Obergefell v. Hodges and the 2022 Respect for Marriage Act. Local city or county registries are even weaker: they carry some weight within that municipality but have no force outside it.
Children Are Not Covered Automatically
Registering a domestic partnership does not make both partners the legal parents of a child born or adopted into the relationship. In most places, only the biological parent is the legal parent unless the other partner completes a second-parent adoption. Without that adoption, the non-biological partner has no custody rights if the couple separates and no legal standing to make medical or educational decisions for the child.8LII / Legal Information Institute. Domestic Partner Adoption A completed second-parent adoption creates a legal parent-child relationship that survives the partnership itself.
Fill the Gaps With Private Documents
A domestic partnership certificate on its own doesn’t give you everything a marriage does, so same-sex and opposite-sex partners alike should put a few documents in place.
Most states don’t automatically list a domestic partner as a default medical decision-maker, and even states that do often rank the partner below a legal spouse or blood relatives. If your partner is unconscious in a hospital and you aren’t married, staff may defer to a parent or sibling instead of you. A durable power of attorney for healthcare names the person you want making those decisions, and it travels better than a registry certificate when you’re out of state.
Beyond healthcare, consider a durable financial power of attorney for managing each other’s finances during incapacity, updated beneficiary designations on retirement accounts and life insurance, and a will or trust that explicitly names your partner. Domestic partners generally do not inherit automatically under intestacy laws the way spouses do, so leaving this to chance can leave the surviving partner with nothing.