A domestic partner is an adult who has registered a committed relationship with another adult under a state, county, or city law that recognizes the pairing and grants it some of the legal protections of marriage without a marriage license. Roughly a dozen states and the District of Columbia offer statewide domestic partnership or civil union registration, and many individual cities and counties maintain their own registries. The rights attached to the status vary sharply by jurisdiction, and the federal government does not treat domestic partners as spouses for taxes, Social Security, immigration, or most other federal purposes.
Who Qualifies as a Domestic Partner
Specific criteria vary, but most registries ask for the same core things. Both people must be at least 18 and mentally competent to consent. Neither can be currently married or already registered in another partnership or civil union with someone else. They cannot be related by blood in a way that would bar them from marrying. They must share a residence, and many registries also want evidence that they share financial responsibility for one another, such as a joint account, a shared lease, or a mutual beneficiary designation.1U.S. Office of Personnel Management. What Is the Definition of a Domestic Partner?
One exception matters for older couples. A few states limit opposite-sex domestic partnerships to couples where at least one partner is 62 or older, preserving the arrangement mainly for seniors who would lose a pension or Social Security survivor benefit by remarrying.
Registration itself is usually straightforward. Both partners typically appear together, present photo ID, sign a Declaration of Domestic Partnership (often before a notary or authorized official), and pay a filing fee that generally runs from around $10 to $50. The agency then issues a Certificate of Domestic Partnership, which is the document you show to employers, hospitals, and insurers to prove your status.
What a Domestic Partnership Gets You Under State Law
The state-level rights of a domestic partner depend almost entirely on where the registration happens. A handful of states give registered partners nearly every right a spouse has under state law. Others grant a narrow set of protections such as hospital visitation and access to a partner’s employer health plan. Still others offer no registration at all.
Hospital Visitation and Medical Decisions
Most registries let a domestic partner visit a hospitalized partner and, in many places, make medical decisions if the partner is incapacitated. Without a registered partnership or a healthcare power of attorney, providers in many states default to biological family for these decisions. Registration places a partner on equal footing with a spouse for medical authority under state law.
Inheritance
In states with comprehensive partnership statutes, a surviving domestic partner inherits from a deceased partner the same way a surviving spouse would under intestate succession rules. In states with limited registries, a partner may inherit nothing automatically. A will or trust is the safer route regardless, because state inheritance rights do nothing for property located in a state that does not recognize the partnership.
Shared Financial Obligations
Comprehensive partnership states can hold partners responsible for each other’s debts for basic household necessities like food, shelter, and medical care, much as spouses are. Outside those states, simply living together does not make you liable for your partner’s debts. Registering in a state that imposes spousal-equivalent duties means taking on real obligations, not just collecting benefits.
What It Does Not Get You Under Federal Law
The federal government draws a hard line between marriage and everything else. The 2022 Respect for Marriage Act requires federal recognition of any valid marriage, but the statute’s language covers “marriage” between two individuals and does not reach domestic partnerships or civil unions.2Congress.gov. H.R.8404 – Respect for Marriage Act That line runs through almost every major federal program.
Federal Taxes
The IRS has stated plainly that registered domestic partners “are not considered as married or spouses for federal tax purposes.” They file as single, or as head of household if they qualify, and they cannot file jointly.3Internal Revenue Service. Answers to Frequently Asked Questions for Registered Domestic Partners and Individuals in Civil Unions For couples with uneven incomes, the lost joint-filing savings can run into thousands of dollars a year.
Gift and estate taxes are the sharper cost. Spouses can transfer unlimited assets to each other during life or at death with no gift or estate tax. Domestic partners get no such exemption. Transfers between partners are subject to the standard annual gift tax exclusion of $19,000 per recipient in 2026, and anything above that counts against the lifetime exclusion of $15,000,000.4Internal Revenue Service. Frequently Asked Questions on Gift Taxes A surviving domestic partner can face an estate tax bill a surviving spouse would never see.
There is also a quieter cost tied to employer health benefits. When an employer provides coverage to a spouse, the value is tax-free to the employee. When the same employer covers a domestic partner, the IRS treats the employer’s share of the premium as imputed income to the employee, taxable and reported on the W-2. The annual hit typically runs into the thousands, depending on the plan.
Family and Medical Leave
The federal Family and Medical Leave Act allows an eligible employee to take up to 12 weeks of unpaid leave to care for a spouse with a serious health condition. The Department of Labor’s definition of spouse covers married couples and common-law marriages and explicitly excludes domestic partners and civil union partners.5U.S. Department of Labor. Fact Sheet #28L: Leave Under the Family and Medical Leave Act – Spouse Some state leave laws are broader, but federal law does not protect your job while you care for a seriously ill domestic partner.
Social Security
Married spouses can claim spousal benefits worth up to half of a partner’s full retirement benefit, and surviving spouses can claim survivor benefits. The Social Security Administration says some people in non-marital legal relationships such as domestic partnerships may qualify in limited circumstances and encourages those who think they may be eligible to contact the agency.6Social 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? In practice, most domestic partners do not qualify.
Pension Survivor Benefits
Private employer pension plans governed by ERISA must provide a Qualified Preretirement Survivor Annuity to a surviving spouse. The Pension Benefit Guaranty Corporation has confirmed that guarantee applies only to legally married spouses and does not extend to domestic partners, even where state law treats the partnership as the equivalent of marriage.7Pension Benefit Guaranty Corporation. Domestic Partner Not Entitled to QPSA Benefit Individual employers can voluntarily extend pension protections to partners, but no federal rule requires it.
COBRA
Federal COBRA law gives a spouse an independent right to continue employer health coverage after a qualifying event like the employee’s job loss. Domestic partners are not qualified beneficiaries under COBRA. A partner can continue coverage only if the employee elects COBRA and includes them. Some employers voluntarily offer COBRA-like continuation for partners, but federal law provides no independent safety net.
Immigration Sponsorship
A U.S. citizen can sponsor a spouse for an immigrant visa. The State Department defines spouse as a “legally wedded husband or wife” and does not extend sponsorship to domestic partners.8U.S. Department of State. Immigrant Visa for a Spouse of a U.S. Citizen (IR1 or CR1) For couples with a non-citizen partner, this gap is often the deciding factor in choosing marriage over partnership.
Why Some Couples Still Choose a Domestic Partnership
Since the 2015 Obergefell decision made marriage available to all couples nationwide, the practical case for choosing a domestic partnership over marriage has narrowed. Joint federal tax filing, FMLA coverage, immigration sponsorship, and guaranteed interstate recognition all come with marriage and none come with partnership.
The status still serves specific groups. Older couples often use it to preserve Social Security survivor benefits or a pension from a prior marriage that they would lose by remarrying, which is why some states restrict opposite-sex partnerships to couples where one partner is at least 62. Some couples object to the institution of marriage on personal or philosophical grounds and want a legal framework that stops short of it. And in states with comprehensive partnership statutes, couples can secure full state-level rights without taking on the federal entanglements of marriage.
If You Move to Another State
Domestic partnerships are not portable the way marriage is. A marriage valid where performed must be recognized nationwide; a partnership does not have that guarantee.2Congress.gov. H.R.8404 – Respect for Marriage Act A few states expressly recognize partnerships and civil unions from elsewhere, sometimes converting them to equivalent local status. Others simply ignore them. A couple who registered in a state with comprehensive partnership rights and then moves to a state without any partnership law can lose most of the protections they thought they had. If you own property in more than one state, or expect to relocate, confirm with a family law attorney in the destination state whether your partnership will carry over before you rely on it.