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Living together in California? Protect yourself with a cohabitation agreement

On Behalf of | Dec 23, 2025 | Palimony |

Many unmarried couples in California choose to share a home and build a life together. While it’s an exciting step, it’s important to note that California law doesn’t grant unmarried couples the same “automatic” property rights as married partners.

Without a clear plan, a breakup can turn into a major financial headache. A cohabitation agreement is a simple way to get on the same page and protect your future.

How does it work?

Think of a cohabitation agreement as a contract for your relationship. It’s a written document that explains how you and your partner will handle money and property while you’re living together. Most agreements focus on a few main things:

  • Owning a house: If you buy a home together, the agreement specifies how much of the property each person owns.
  • Paying the bills: It determines who is responsible for rent, utilities and any credit card debt.
  • Splitting things up: It sets a plan for how to divide your stuff or provide financial help if you ever go your separate ways.

Having these details in writing prevents the “he-said, she-said” arguments that often happen during a split. California requires real estate transfers to be in writing. However, some exceptions apply to cohabitation cases, including oral or implied agreements.

The truth about “palimony”

You have probably heard this term. In California, “palimony” usually refers to a “Marvin Claim,” stemming from a famous 1976 court case involving actor Lee Marvin. It allows unmarried partners to sue for property division or support based on express (written or verbal) contracts, as well as implied contracts evidenced by the parties’ conduct.

The problem is that oral promises are difficult to prove and very expensive to litigate. A written agreement settles the debate before it even starts by providing clear proof of what you both actually intended. This proactive step can save you thousands of dollars in legal fees and years of stress.

What about the kids?

If you have children, it’s essential to understand that you can’t use a cohabitation agreement to bypass the law. California courts always have the final word on what happens with kids, involving:

  • Child support: You cannot sign away a child’s right to financial support in a private contract.
  • Custody: You can’t predecide who gets the children; a judge will decide based on what is best for the child at that time.

While you can’t make “final” rules about children in your agreement, you can still document your shared parenting goals, demonstrating to the court that you both intended to provide a stable and supportive home from the outset.

Making it official

Creating one of these agreements is ultimately an act of mutual respect. Think of a cohabitation agreement like any other important contract in California. It is a flexible tool that lets you set your own rules for your relationship. However, you have to be careful about how you frame the “deal.”

In California, these contracts are only valid if they address financial support, property sharing or household duties. If the agreement implies that one person is being compensated for a sexual relationship, a judge will likely throw the whole thing out. To make it stick, the document should clearly focus on your shared finances and nonsexual contributions to the household.

Having a skilled lawyer draft or review your cohabitation agreement is crucial to ensure the document protects you and will hold up in court if you ever need it.