You bought a couch together. You adopted a dog together. You've been living in an apartment for two years and everything feels intertwined.
Then you break up.
For married couples, there are legal frameworks — divorce law — that provide structure. For unmarried couples, there's almost nothing. Unless you've written something down, you're negotiating from scratch in an emotionally charged moment.
The legal reality for unmarried couples
In most U.S. states, unmarried partners have no automatic property rights over each other's assets. This means:
- Property you owned before moving in is entirely yours.
- Property purchased together is murky at best.
- Courts won't divide "relationship property" the way divorce courts handle marital property.
The result? Whoever's name is on the receipt, the account, or the lease has the legal upper hand — regardless of who actually paid or contributed.
The furniture problem
You go to IKEA and spend $3,000 furnishing a shared space. You pay for most of it because you had more savings at the time. Two years later, the relationship ends. Who gets the furniture?
Legally: whoever can prove payment. Practically: whoever takes it first, or whoever is willing to fight over it.
A cohabitation agreement solves this proactively. You can document shared purchases, agree how items will be valued and divided, and decide whether unequal contributions change the split.
The apartment problem
One partner's name is on the lease. The other has been paying their share every month for 18 months. When they break up, the lease-holder can, in most states, ask the other to leave with very little notice — and keep the apartment.
The best protection here is a written agreement that spells out notice requirements, what happens to the security deposit, and how moving costs are handled.
The pet problem
Pets are considered property under U.S. law in most states. There's no "pet custody" the way there's child custody.
If you adopted a pet together, documenting ownership — or a shared custody arrangement — in writing is the only way to ensure both partners have defined rights. Without it, it defaults to whoever is legally listed as the owner, or whoever has physical possession when the relationship ends.
What to document now, while things are good
A cohabitation property checklist should cover:
- Pre-existing property: Each partner keeps what they owned before moving in.
- Jointly purchased items: List major purchases and the agreed ownership split.
- Debt responsibility: Each person stays responsible for debts in their own name.
- Pets: Who is the primary owner, and what is the arrangement if you separate?
- Lease or mortgage: Notice requirements, deposit return, and move-out timelines.
You don't need a lawyer to document this. You need each other's honest answers and a place to write them down.
Create your free cohabitation agreement → It takes about 5 minutes and covers all of the above.