Unmarried couples who live together in Wisconsin have no automatic property rights in each other’s assets. Wisconsin abolished common law marriage in 1917, so cohabitation — no matter how long it lasts — does not create a legal marriage or the protections that come with one.1Social Security Administration. POMS PR 05610.055 – Wisconsin Ownership follows whoever’s name is on the title, there is no divorce court to divide things if you split up, and the surviving partner inherits nothing if the other dies without a will. Everything that marriage would give you automatically has to be built with documents.
Who Owns What While You Live Together
Wisconsin decides ownership by legal title. The name on the deed, the vehicle title, the bank account, or the retirement plan is the owner. If your partner paid half the down payment on the house but only their name is on the deed, you own no part of the house in the eyes of the law. The same goes for cars, accounts, and anything else that comes with paperwork.
When two unmarried people are on a deed together, Wisconsin recognizes two main forms of co-ownership, and the default matters a great deal.
- Tenants in common. Each person holds a separate share, and the shares do not have to be equal. If one owner dies, their share passes through their estate under their will or under intestacy law. The surviving co-owner does not automatically inherit it.
- Joint tenancy with right of survivorship. Each person holds an equal share, and when one owner dies, their share passes automatically to the surviving owner, outside probate.
Wisconsin defaults to tenancy in common when two or more people are named on a deed, unless the document expressly creates a joint tenancy with language such as “as joint tenants” or “with right of survivorship.”2Wisconsin State Legislature. Wisconsin Statutes 700.18 and 700.19 This catches people out. A couple buys a home together, the deed is silent on the type of ownership, and they assume the house will pass to the survivor. It won’t. The deceased partner’s share will go to their family through probate.
What Happens If You Break Up
There is no divorce process for unmarried partners. If you can agree on who takes what, you can simply split your things and go. If you can’t agree, and your name isn’t on the title to something you helped pay for or build, you have to sue in civil court and use a legal theory to recover your share.
The Wisconsin Supreme Court opened that door in Watts v. Watts (1987), holding that unmarried partners are not shut out of the courts just because they weren’t married.3Justia. Watts v. Watts Three claims come out of that case and the statutes around it.
Unjust Enrichment
This is the most common claim. You have to show you gave your partner a benefit, that they knew about and accepted it, and that letting them keep it without paying you would be unfair.4Wisconsin Court System. Wisconsin Civil Jury Instruction 3028 Mortgage payments on a home titled only in your partner’s name, paying for renovations, or substantial labor that raised the property’s value are all the kinds of contributions courts look at. Bank records help prove it.
Wisconsin treats unjust enrichment as a quasi-contractual claim, so the six-year contract limitations period applies.5Wisconsin State Legislature. Wisconsin Statutes 893.43 The clock likely starts running when the relationship ends and the benefit is kept. Waiting too long can cost you the claim.
Constructive Trust
A constructive trust is a stronger remedy because it transfers ownership of specific property rather than just awarding money. Watts allows a court to impose one when the partner proves unjust enrichment plus either a confidential relationship or unconscionable conduct by the other.3Justia. Watts v. Watts This matters most when the fight is over a specific house rather than a dollar figure.
Contract Claims
If you and your partner had an explicit agreement about how property would be shared, that is an express contract. If no one wrote anything down but your behavior showed a mutual understanding — pooled finances, joint purchases, shared decisions about major assets — that may support an implied contract. One important rule from Watts: the contract has to be independent of the sexual relationship and supported by its own consideration, meaning each partner gave or promised something of value.3Justia. Watts v. Watts A promise conditioned on staying together will not hold up.
Any of these claims is a full civil lawsuit, not a small claims matter. You need an attorney to draft the summons and complaint, and Wisconsin does not automatically award attorney fees to whoever wins, so the cost of litigating has to be weighed against what you expect to recover.
What Happens If Your Partner Dies
If your unmarried partner dies without a will, Wisconsin’s intestacy statute controls, and that statute does not include unmarried, unregistered partners anywhere in the line of inheritance. Assets titled solely in the deceased partner’s name pass first to their children, then to parents, then to siblings and their descendants, then to grandparents and their descendants. If no relatives can be found, the property escheats to the state.6Wisconsin State Legislature. Wisconsin Statutes 852.01 The surviving partner receives nothing.
One narrow exception exists. Wisconsin’s intestacy statute recognizes “surviving domestic partners” who registered under Chapter 770 of the Wisconsin Statutes, giving them inheritance rights similar to a surviving spouse.6Wisconsin State Legislature. Wisconsin Statutes 852.01 The registry was created primarily for same-sex couples before marriage equality, and most cohabiting couples have not registered. If you have not registered, the statute treats you as a legal stranger to your partner.
Three tools fix this problem.
A will. Your partner can leave property to you by will. Without one, intestacy controls.
Joint tenancy with right of survivorship. Real estate, bank accounts, and other assets held this way pass automatically to the surviving owner at death, outside probate and regardless of what any will or the intestacy statute says.
A transfer on death (TOD) deed. Wisconsin lets a property owner name a beneficiary who will receive real estate automatically at death, without probate. The deed must be in writing, name the owner and the beneficiary, state that the transfer takes effect only at death, and be recorded with the county register of deeds before the owner dies.7Wisconsin State Legislature. Wisconsin Statutes 705.15 The owner keeps full control during life and can revoke the deed any time. For a couple where only one partner owns the home, a TOD deed is one of the simplest ways to make sure the other partner inherits it.
Beneficiary designations on retirement accounts and life insurance policies work the same way. Whoever is named on the form receives the asset, no matter what the will or intestacy statute says. Review those designations whenever your relationship status changes.
Healthcare and Financial Decisions
Marriage automatically gives spouses authority to make medical decisions for each other in an emergency. Without marriage, you have none, even after decades together. If your partner is incapacitated, those decisions fall to their legal next of kin unless the right paperwork is in place.
Wisconsin’s power of attorney for health care statute lets any competent adult name another person as healthcare agent. The document has to be in writing, signed by the person granting authority, and witnessed by two adults who are not the agent being named.8Wisconsin State Legislature. Wisconsin Statutes 155.10 These documents only run one direction, so each partner needs to sign one naming the other.
A financial power of attorney does the same for money matters, letting your partner handle bills, bank accounts, and property transactions if you cannot. These are standard estate planning documents, inexpensive to prepare, and they fail only when they do not exist.
Cohabitation Agreements
A cohabitation agreement is a written contract between unmarried partners covering property, finances, and what happens if you split. Wisconsin courts enforce these agreements, subject to the same rule from Watts: the agreement must be independent of the sexual relationship and supported by its own consideration.3Justia. Watts v. Watts In practice, that means mutual promises about property, finances, or services rather than promises conditioned on staying in the relationship.
A useful agreement starts with both partners putting their full financial picture on the table, including every asset and debt, and then addresses:
- Property each partner brings into the relationship, and whether any of it becomes jointly owned
- How new purchases will be titled and how they would be divided on separation
- Who pays which household expenses and how contributions are tracked
- Responsibility for joint debts like car loans or credit cards
- Whether either partner will provide financial support to the other after separation
Each partner should have their own attorney review the agreement before signing. An agreement signed under pressure, without full financial disclosure, or without independent legal advice is far more vulnerable to challenge later. Notarization is not required for enforceability but adds a layer of protection.
Things Wisconsin Documents Cannot Fix
Some rights come only with marriage, and no Wisconsin planning tool replaces them.
Social Security survivor benefits. Married spouses and ex-spouses married at least 10 years can collect survivor benefits when their partner dies. Unmarried partners cannot, regardless of how long they lived together or how intertwined their finances were.9Social Security Administration. Who Can Get Survivor Benefits This is a federal rule Wisconsin cannot change. Life insurance and retirement account beneficiary designations are the usual way to fill the gap.
The capital gains exclusion on a home sale. Married couples filing jointly can exclude up to $500,000 of gain on the sale of a primary residence. A single person’s exclusion is $250,000. Unmarried co-owners can each claim $250,000 on their own share, but only if each independently meets the ownership and use tests of two out of the last five years.10Internal Revenue Service. Topic No. 701, Sale of Your Home
Tax-free transfers between partners. Spouses can transfer unlimited property to each other without gift tax consequences. Unmarried partners cannot. Adding your partner to the deed of a $400,000 home is a $200,000 gift, well past the 2026 annual exclusion of $19,000 per recipient, and requires a gift tax return.11Internal Revenue Service. What’s New – Estate and Gift Tax Tax usually is not owed right away because the excess counts against the lifetime exemption, but the return still has to be filed.
Everything else that marriage provides automatically — inheritance, decision-making, property division on separation — you can replicate in Wisconsin with a will, a TOD deed or joint tenancy, powers of attorney, and a cohabitation agreement. None of it happens on its own. That is the whole point of planning while things are good.