A registered domestic partner is a person in a legally recognized relationship, created by filing with a state or local government, that grants many of the same rights as marriage under state law but is not recognized as a marriage under federal law. Roughly nine states and the District of Columbia maintain comprehensive domestic partnership or civil union frameworks, and the specific rights attached to the status depend heavily on where you register. Federal programs — taxes, Social Security in some cases, FMLA, COBRA — generally treat you as unmarried.
Where You Can Register
As of early 2026, states with well-established domestic partnership or civil union laws include California, Colorado, Hawaii, Illinois, Nevada, New Jersey, Oregon, and Washington, along with the District of Columbia. A handful of other states recognize civil unions rather than domestic partnerships, with similar practical effect: both create a legally recognized relationship short of marriage.
Some cities and counties run their own domestic partnership registries even when the state does not. These local registrations usually carry far narrower protections than a statewide partnership and may only reach city employment benefits or hospital visitation policies within the municipality. If you are relying on a local registry, confirm in writing exactly which rights it grants.
Who Qualifies
Rules vary, but most jurisdictions share the same core requirements. Both partners must usually be at least 18 and capable of consenting. You generally must share a residence at the time you apply. Neither partner can be currently married or in another registered partnership that has not been formally ended, and close blood relatives cannot register with each other, mirroring the restrictions on marriage.
A few states add an age-based rule for opposite-sex couples. Washington, for example, requires at least one partner to be 62 or older for an opposite-sex domestic partnership. Applicants typically confirm eligibility under penalty of perjury on the registration form itself.
How Registration Works
You start with an official declaration form, often called a Declaration of Domestic Partnership, available through your state’s Secretary of State or local county clerk. Both partners provide full legal names, current addresses, and dates of birth, and bring government-issued photo identification. Both sign the declaration, and most states require those signatures to be notarized before submission.
You then file the signed, notarized declaration with the designated state or local registrar, in person or by mail. Once the registrar confirms the form is complete, the government issues a Certificate of Registered Domestic Partnership. That certificate is your working proof of the relationship for employers, insurers, and healthcare providers.
State-Level Rights
In states with comprehensive partnership laws, registered partners pick up many of the rights and obligations that attach to marriage under state law. The most common protections include:
- Community property treatment of assets and debts acquired during the partnership, in states that extend those rules to domestic partners (California, Nevada, and Washington).
- Inheritance under intestate succession if your partner dies without a will, in the same share a surviving spouse would receive.
- Authority to make healthcare decisions for your partner during emergencies or incapacity, with some states placing partners at the same priority level as a spouse in the default surrogate hierarchy.
- Hospital visitation on the same terms as a legal spouse.
Not every state grants every item on this list. States with narrower frameworks provide only a subset, so read your own state’s statute before assuming full equivalence with marriage.
What Federal Law Still Withholds
Whatever your state status, the IRS does not treat domestic partners as married. You cannot file a federal return as married filing jointly or married filing separately; you file as single, or as head of household if you qualify.1Internal Revenue Service. Answers to Frequently Asked Questions for Registered Domestic Partners and Individuals in Civil Unions
Imputed Income on Health Benefits
If your employer covers your partner on its health plan, the value of that coverage is generally taxable income to you. A married employee pays no extra tax when a spouse is added; because the IRS does not recognize domestic partners as spouses, the employer-paid premium for your partner gets added to your gross income as imputed income.2Internal Revenue Service. Employer’s Tax Guide to Fringe Benefits The exception: if your partner qualifies as your tax dependent, the coverage may be excluded.
Gift and Estate Tax
Spouses enjoy an unlimited marital deduction, meaning they can transfer any amount to each other during life or at death without federal gift or estate tax. Domestic partners do not qualify, because the deduction is limited by statute to transfers between spouses.3Office of the Law Revision Counsel. 26 USC 2523 – Gift to Spouse Gifts to your partner above the annual exclusion ($19,000 per recipient in 2026) count against your lifetime exemption, which is $15,000,000 for 2026.4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Most people will never owe gift or estate tax at those levels, but the ceiling itself is a disadvantage compared to the no-limit treatment married couples receive.5Internal Revenue Service. Frequently Asked Questions on Gift Taxes
Social Security
Social Security’s treatment of domestic partnerships is not a flat yes or no. The Social Security Administration uses the term “non-marital legal relationship” (NMLR). For same-sex couples, the SSA will treat a domestic partnership as a marriage for spousal benefits, survivor benefits, and Medicare, but only if the state where the partner lived would have allowed the surviving partner to inherit a spouse’s share of the deceased partner’s estate.6Social Security Administration. POMS GN 00210.004 – Non-Marital Legal Relationships States with comprehensive partnership laws generally meet that test. For opposite-sex partners, the SSA applies different rules, and the path to benefits recognition is less clear.7Social Security Administration. Handbook Section 406 – Effect of Remarriage on Widow(er)’s Benefits
FMLA Leave
The Family and Medical Leave Act allows eligible employees up to 12 weeks of unpaid leave to care for a spouse with a serious health condition. FMLA defines “spouse” as a husband or wife; domestic partners and civil union partners are expressly excluded.8Office of the Law Revision Counsel. 29 USC 2611 – Definitions If your partner becomes seriously ill, you have no federal right to protected leave to care for them.9U.S. Department of Labor. Fact Sheet #28L – Leave Under the Family and Medical Leave Act Some state leave laws and employer policies are broader, so check both.
COBRA
Under federal COBRA, domestic partners are not “qualified beneficiaries.” Your partner has no independent right to elect continuation coverage after a qualifying event. The employee may elect COBRA and continue the partner on the plan, but the choice sits with the employee. Some states run their own mini-COBRA programs, and some employers voluntarily extend continuation to domestic partners.
Children and Parentage
In states with comprehensive partnership laws, children born during the partnership often benefit from the same legal presumptions that apply to married couples. If one partner gives birth while the partnership is active, both partners are generally presumed to be the child’s legal parents, and both retain rights and obligations if the partnership ends.
The limit here is portability. A state that does not recognize domestic partnerships may not honor the parentage presumption your home state provides. Family law attorneys commonly recommend that the non-biological parent complete a second-parent adoption or obtain a court judgment of parentage. A court order or adoption decree carries far more weight across state lines than a presumption that depends on partnership status, and the adoptive parent’s rights survive the end of the partnership.
If You Move to Another State
Marriage is recognized in every state as a matter of federal constitutional law. Domestic partnerships have no equivalent guarantee. Register in California and relocate to a state without a partnership statute, and the new state may or may not honor the status or any of the rights that came with it.
As a practical matter, rights that could also have been created by private contract (healthcare decision-making, property arrangements) tend to travel better than rights that depend on the partnership status itself. Many couples back up a registered partnership with standalone documents: a durable power of attorney, a healthcare proxy or advance directive, and a will that names the partner directly.
How a Partnership Ends
A registered domestic partnership does not simply fade when a relationship does. Until it is formally ended, both partners remain legally bound by its obligations, including potential liability for debts in community property states.
Simplified Termination
Many states offer a streamlined process for short, uncomplicated partnerships. Eligibility typically requires no minor children in common, limited property, little shared debt, and mutual agreement to end the relationship. You file a Notice of Termination (or similar form) with the agency where you originally registered. No court appearance is required.
Court Dissolution
If you have shared property, children, or significant debts, or if you cannot agree on terms, you need a formal court dissolution. The process tracks a divorce: the court divides community property and debts, sets custody and support for any children, and may order partner support.
Automatic Termination
A partnership ends automatically if the partners marry each other, converting the status into a marriage. The death of one partner also ends the registration immediately, though the surviving partner keeps any inheritance rights that had already vested. Neither event requires a termination filing.