Property and Debt for Couples Who Never Marry

What does the law assume about an unmarried couple's property?

Nothing. That is the whole answer, and it surprises people who have spent a decade merging their lives. Marriage triggers a body of law that treats a couple as an economic unit: property acquired during the marriage becomes marital or community property, income earned by one spouse creates rights in the other, and a court has power to divide everything at the end. None of that machinery starts up for unmarried partners.

Instead, ordinary property law applies, the same rules that would govern two roommates or two business acquaintances. Whoever holds title owns the thing. Whoever's name is on the account owns the balance. Money one partner earns belongs to that partner. Years of shared meals, shared holidays, and shared parenting do not change any of it.

The one exception is a jurisdiction that still permits informal marriage, where a couple may have become legally married without noticing. That is a narrow group of places with specific requirements, described in where common-law marriage still exists and what proves it. Everywhere else, cohabitation is legally invisible, and no amount of time converts it into anything.

How is ownership actually decided?

Start with title, then look at contribution, then look at agreement. Courts work through those in roughly that order, and most disputes are resolved at the first step.

Where two people hold title together, the form of co-ownership matters as much as the fact of it. Joint tenancy with right of survivorship means that when one owner dies, the survivor takes the whole thing automatically, outside any will. Tenancy in common means each owner holds a defined share that passes under their will or to their heirs. Unmarried couples frequently sign whatever the closing agent put in front of them and discover the difference at the worst possible time.

Unequal contributions deserve unequal shares, and a deed can say so. If one partner puts in the entire down payment and the other pays half the mortgage, a deed reciting equal ownership overrides the intuition that each should get back what they put in. Fix that at closing, in the deed or in a side agreement, rather than arguing about it years later.

What if you paid for something in your partner's name?

Then your claim is not a property claim; it is a contract or restitution claim, and it is harder to win. Courts do have tools for this situation, but each one requires proof of something beyond the relationship itself.

• Express contract. An actual agreement, written or oral, that you would receive an interest or be repaid. Written is dramatically easier to prove.
• Implied contract. An agreement inferred from conduct, such as a long pattern of payments made on the understanding of shared ownership.
• Unjust enrichment. A claim that your partner received a benefit it would be unfair to keep without paying for it.
• Resulting or constructive trust. A remedy that treats the titled owner as holding the property for you, used where the equities are strong.
• Quantum meruit. Payment for the reasonable value of services rendered, when services rather than money were the contribution.

Two limits recur across states. Courts generally will not compensate the ordinary services of living together, meaning cooking, cleaning, companionship, and household work are usually treated as given freely rather than as consideration. And some states refuse to enforce agreements where the relationship itself is described as the consideration. The claims that succeed are the ones that look commercial: documented payments toward a mortgage, labor on a renovation, capital put into a business.

The evidence problem is severe. Bank transfers between partners, made without notes, look like gifts. Cash contributions leave no trail at all. If you are contributing to an asset in your partner's name, write down what the contribution is for and keep proof of every payment, because the alternative is asking a judge to reconstruct a decade of intentions from testimony.

Are you responsible for your partner's debts?

Generally not. Liability follows the signature. A credit card in one partner's name, a student loan taken out before the relationship, a car note signed alone, and medical bills incurred by one person are that person's obligations. A collector who contacts you about a partner's individual debt is usually not entitled to payment from you at all.

The exceptions are specific and worth knowing.

• You co-signed or are a joint account holder. Then you are fully liable, not liable for half. The lender can pursue whichever of you is easier to collect from.
• You are an authorized user. Usually not liable for the balance, though the account may still appear on your credit report.
• You pledged collateral. Property you put up secures the debt even if you did not sign the note.
• Statutory doctrines. Some states impose liability between spouses for necessary expenses such as medical care. These generally do not reach unmarried partners, but a hospital may still try.

The credit consequences are separate from the legal ones. A joint account reports to both partners' files, and a partner's late payment damages your score even though the purchase was theirs. Which entries can be corrected and which simply have to age off is set out in what moves a credit score and what cannot be removed. If a collector pursues you for an old debt you never owed, be careful about paying anything toward it, for the reasons explained in time-barred debt and why paying can restart the clock.

What happens if one partner dies?

An unmarried partner inherits nothing by default. Intestacy statutes, the rules that apply when someone dies without a will, distribute an estate to a spouse, children, parents, and more distant relatives in a fixed order. A partner of thirty years appears nowhere on that list and can be left with no legal claim while a distant relative inherits everything.

Three tools change that outcome, and all of them have to be set up while both partners are alive. A will names the partner as a beneficiary. Beneficiary designations on retirement accounts, life insurance, and payable-on-death accounts pass those assets directly and override a will. Joint tenancy with right of survivorship passes real estate automatically to the surviving owner.

Control matters as much as money. Without documents, an unmarried partner may have no authority over funeral arrangements, no standing in probate, and no right to remain in a jointly occupied home that was titled solely in the deceased partner's name. Some states give a landlord or the estate the ability to remove a non-owner occupant quickly. The authority documents that address the equivalent problem during a medical crisis are covered in medical and financial authority between partners.

What should a cohabitation agreement actually say?

It should answer the questions a judge would otherwise have to guess at. It does not need to be long, and it does not need to cover everything, but the items below are the ones that generate litigation.

1. Separate property. A list of what each partner brought in and a statement that it stays separate.
2. The home. Who owns what share, how the down payment and payments are credited, who may stay if the relationship ends, and how a buyout is priced.
3. Contributions. Whether payments toward the other partner's property are gifts, loans, or purchases of an interest.
4. Debt. Who is responsible for which obligations, and a promise not to incur joint debt without written consent.
5. Support. Whether either partner will provide support afterward, and if so how much and for how long.
6. Process. How disputes get resolved, and how the agreement can be changed.

Sign it before the assets exist rather than after, have each partner review it with separate counsel if the numbers are significant, exchange honest financial disclosures, and keep signed originals somewhere both of you can reach. States differ on formality requirements, and a court in a state that requires writing for agreements about real estate will not enforce a handshake. If the relationship does end, the mechanics of unwinding shared assets under whatever agreement exists are set out in ending an unmarried relationship with shared assets.