Illinois Domestic Partnership: Requirements, Rights, and Filing

An Illinois domestic partnership is a local registration you file with a city or village clerk to formally document a committed relationship. It is not a statewide legal status, and it carries far fewer rights than marriage or a civil union. Only a handful of Illinois municipalities still operate public registries, and the certificate’s practical value is mostly limited to proof of your relationship for employers or medical providers that choose to honor it.

Where You Can Register

Because domestic partnerships exist under local ordinances rather than state law, your options depend on where you live. Two active public registries in Illinois are worth knowing about.

The City of Urbana operates a registry through its City Clerk’s office, open to any two single adults living together in a committed relationship.¹ The Village of Oak Park also maintains a registry, but its ordinance limits registration to same-sex couples who are Oak Park residents and have lived together for at least six months.²

Cook County’s registry closed to new registrations in 2011 after Illinois enacted the Civil Union Act. Certificates issued before that closure remain valid, but no new Cook County certificates are being issued. Chicago has a domestic partnership ordinance, but it applies only to city employees adding a partner to benefits, not as a public registry.³ If you live outside Urbana or Oak Park, check directly with your local clerk to see whether an ordinance exists where you are.

Who Qualifies

Requirements vary by municipality, but most Illinois registries share the same core criteria. Using Urbana as a representative example, both partners must:

Be at least 18 and legally able to enter into a contract.
Share a common permanent residence and be jointly responsible for each other’s basic living expenses.⁴
Not be married and not already registered as someone else’s domestic partner.¹
Not be related by blood in a way that would bar marriage under Illinois law.
Not be claimed as a dependent on another person’s federal income tax return.⁴

Oak Park adds conditions of its own. Both partners must be the same sex, must have been each other’s sole domestic partner for at least six months, and must have cohabited for at least six months before filing.² Always read the ordinance for the municipality where you plan to file, because the details differ.

How to Register and What It Costs

Registration involves completing an affidavit or declaration in which both partners swear under penalty of perjury that they meet the eligibility requirements. You will need government-issued photo identification for both partners. A driver’s license, state ID card, or passport is typically accepted.¹

Most registries let you file in person at the clerk’s office. Some also accept mailed applications, though signatures on a mailed affidavit generally need to be notarized. Filing fees typically run $40 to $50. Urbana charges $40⁴ and Oak Park charges $50.² Once the clerk processes the paperwork and payment, you receive an official certificate. Urbana also provides wallet-sized copies.¹

What the Certificate Actually Gives You

The certificate’s main practical use is as proof of your relationship for employers and institutions that agree to honor it. Some employers will add a domestic partner to a group health insurance plan based on the certificate, though no employer is legally required to do so. Self-funded employer health plans governed by ERISA can decline domestic partner coverage regardless of any local ordinance. Whether you get benefits comes down to your employer’s voluntary policy.

A certificate can also help with hospital visitation by giving medical staff documented evidence that you and your partner share a committed relationship.

Beyond those uses, the legal weight drops off sharply. A domestic partnership does not make you a spouse under Illinois law. It does not affect how your property passes at death. Under Illinois intestate succession rules, only a surviving spouse inherits automatically, and a domestic partner has no inheritance rights unless named in a will.⁵ The same gap applies to property division, spousal support, pension benefits, and wrongful death claims. None of those protections attach to a domestic partnership.

If you want the full package of state-law spousal protections without marrying, a civil union under the Illinois Religious Freedom Protection and Civil Union Act gives partners the same legal rights, obligations, and protections as married spouses under Illinois law.⁶ A domestic partnership does not.

Federal Tax Treatment

The IRS treats registered domestic partners as unmarried, regardless of any state or local registration.⁷ You cannot file jointly. Each partner files individually, usually as single or head of household if they qualify.

The tax picture gets more complicated when employer health benefits are involved. If your employer adds your partner to your health plan, the IRS treats the employer’s share of the premium for your partner’s coverage as taxable income to you. This “imputed income” appears on your W-2 and is subject to federal income tax and payroll taxes, raising your tax bill even though you never receive the money as cash. The exception is narrow. If your partner qualifies as your tax dependent because you provide more than half of their support, the coverage can be excluded from your income.⁷ Partners with their own income typically won’t meet that threshold.

Ending a Domestic Partnership

Terminating a domestic partnership is much simpler than a divorce or a civil union dissolution. No court proceeding is required. You file an affidavit or notice of termination with the same clerk’s office where you registered. Both partners can file jointly, or either partner can file alone. If one partner files alone, most ordinances require proof that the other partner was notified, usually by certified or registered mail.

Oak Park’s ordinance requires a termination statement within 30 days of any change that causes the partnership to no longer meet the eligibility requirements. Some jurisdictions impose a waiting period, often 30 days, during which either partner can rescind the termination. Termination fees are generally modest, from nothing up to $50. After a termination is final, there may be a waiting period before either partner can register a new domestic partnership. In Oak Park, that waiting period is six months.²

A domestic partnership also ends automatically if one partner dies or if the partners marry each other or enter a civil union.

Documents to Pair With Your Registration

Because a domestic partnership leaves so many legal gaps, most couples who go this route also put additional documents in place. Without them, you and your partner are legal strangers for many of the rights spouses take for granted.

A will or trust, so your partner can inherit your assets. Without a will, everything passes to your blood relatives under Illinois intestate succession law.⁵
A healthcare power of attorney, giving your partner authority to make medical decisions if you become incapacitated. Without it, hospitals default to blood relatives.
A financial power of attorney, so your partner can manage your finances, pay bills, or handle banking if you cannot.
Updated beneficiary designations on life insurance, retirement accounts, and bank accounts. These designations override your will, so keeping them current matters.

A domestic partnership works best for couples who want a formal acknowledgment of their relationship for a specific purpose, like employer benefits or hospital visitation, without the broader legal commitments of marriage or a civil union. If you want comprehensive legal protection under Illinois law, a civil union or marriage is the more practical route.

1
City of Urbana. Domestic Partnership Registration
2
American Legal Publishing. Oak Park Village Code 2-10-13 – Domestic Partnership Registration
3
City of Chicago. Municipal Code of Chicago Section 2-152-072
4
City of Urbana. Registration of Domestic Partnership Affidavit
5
Justia Law. Illinois Code 755 ILCS 5 Article II – Descent and Distribution
6
Justia Law. Illinois Code 750 ILCS 75 – Illinois Religious Freedom Protection and Civil Union Act
7
Internal Revenue Service. Answers to Frequently Asked Questions for Registered Domestic Partners and Individuals in Civil Unions