According to a 2023 report by the Pew Research Center, 59% of adults in the United States have cohabited with a romantic partner at some point in their lives, yet fewer than 10% of unmarried couples living together have any written legal agreement governing their shared finances.

That gap is not a minor oversight. It is a financial trap that closes on people slowly, then all at once.

On a Tuesday in March 2021, Maya moved into her partner’s apartment in Austin, Texas. She was 31. She paid half the rent every month by Venmo. She split the grocery bills, the streaming subscriptions, the security deposit on a new place when they moved together eighteen months later. She brought her cat. She did not bring a lawyer.

When the relationship ended two years after that, she had $14,000 in documented shared expenses and no legal claim to any of it. The lease was in his name. The savings account they built together was in his name. The deposit on the new apartment was in his name.

Maya is not a cautionary tale about naivety. She is the median case.

Here is what nobody tells you: in most U.S. states, financial contributions made by an unmarried partner carry no automatic legal weight. None. You can pay rent into someone else’s home for four years and leave with exactly what you arrived with, which is nothing.

Side A: Trust Is Enough Between People Who Love Each Other

The argument against cohabitation agreements usually sounds like this: if you need a legal document to protect yourself from the person you love, you have already answered the question of whether you should be with them.

It is a seductive argument. It frames paperwork as a symptom of distrust rather than a symptom of wisdom. And emotionally, it lands. Nobody moves in with a partner expecting to need a court to settle their rent contributions.

Proponents of this view also point to cost. A cohabitation agreement drafted by a family law attorney typically runs between $300 and $800. For couples in their twenties juggling student debt and entry-level salaries, that number does not feel like protection. It feels like an accusation.

And there is a cultural layer here that deserves honesty. In communities where legal institutions have historically failed people, the idea of inviting lawyers into intimate relationships carries a specific kind of weight. Skepticism toward formal agreements is not always irrational. Sometimes it is inherited trauma, and that is worth naming.

Side B: Love Does Not Survive Financial Ambiguity

The counterargument is not romantic, but it is real.

When did you last check whether your state recognizes common-law marriage? Because if you are in one of the eleven states that still do, including Texas, Colorado, and Iowa, you may already have legal obligations you never agreed to in writing.

A 2022 study published in the Family Law Quarterly by researchers at the University of Michigan found that unmarried cohabitants who separate are significantly more likely to face prolonged financial disputes than married couples who divorce, precisely because there is no established legal framework to resolve competing claims. The study noted that litigation costs in these disputes frequently exceed $8,000 per party, with contested asset cases running considerably higher.

That is not a fringe group of people who did not think things through. These are not people who failed to plan. These are people who trusted love to handle logistics.

Warning: In most U.S. states, there is no legal presumption of shared ownership for unmarried partners. If your name is not on the lease, the deed, or the account, a court will typically treat the asset as belonging entirely to the person whose name is there, regardless of your financial contributions.

The financial exposure is not hypothetical. It is the default outcome.

Why This Number Surprises People

Most people assume that length of relationship confers some kind of legal protection. It does not, outside of common-law marriage states, and even then, the bar for proving a common-law marriage is higher than most people expect.

The Pew Research Center’s 2023 data also showed that 69% of cohabiting adults said they expected to eventually marry their partner. That expectation of permanence is part of what makes the paperwork conversation feel unnecessary. Why plan for an ending you are not planning for?

Because the ending is not the only risk. Disputes over finances can and do happen inside intact relationships. Who owns the furniture if one partner moves out temporarily for work? Who is responsible for back rent if one partner loses their job? If the relationship ended tomorrow, could you prove in writing what you contributed to that shared savings account?

A cohabitation agreement answers all of those questions before they become fights.

Did You Know: A 2021 report from the American Bar Association’s Family Law Section noted that inquiries about cohabitation agreements increased by 27% between 2019 and 2021, driven largely by millennials and Gen Z couples who cohabit before marriage at higher rates than any previous generation.

What a Cohabitation Agreement Actually Does

A cohabitation agreement is not a prenuptial agreement. It does not require you to be planning marriage. It is a contract between two people who live together, and it typically covers:

  • Who is responsible for which monthly expenses
  • How shared savings or property will be divided if the relationship ends
  • What happens to jointly purchased assets like furniture, electronics, or a car
  • Who assumes responsibility for shared debt

It is not a document that predicts failure. It is a document that respects both people enough to be clear.

Pro Tip: A basic cohabitation agreement drafted by a family law attorney typically costs between $300 and $800, a fraction of what you could spend fighting over assets without one. The Family Law Quarterly study cited above found per-party litigation costs frequently exceeding $8,000 in contested cohabitant disputes.

My Position: The Paperwork Is an Act of Love

I have been in that exact conversation. It is not comfortable.

Asking a partner for a cohabitation agreement feels like preparing for a breakup. But here is the reframe that actually helped me: a cohabitation agreement is what you create when you respect someone enough to protect them from ambiguity. Including yourself.

It is messier than the advice columns suggest. You cannot separate financial clarity from emotional vulnerability. The conversation will feel awkward. Have it anyway.

How to Bring It Up Without Making It Weird

Here is a script that does not require you to lead with fear.

“I have been thinking about our finances and I want to make sure we are both protected legally, not because I am worried about us, but because I care about both of us enough to be clear. Can we talk about a cohabitation agreement? I looked into it and it is simpler than I thought.”

That framing does two things. It removes the accusation from the request, and it signals that you have already done the research, which makes the conversation feel collaborative rather than confrontational.

Your Next 3 Steps

Step 1: Pull up your current lease or rental agreement tonight and check whose name or names appear on it. If your name is missing, open your bank app right now and screenshot every rent payment, utility transfer, or shared expense you have made in the past six months. Save those screenshots to a folder labeled with today’s date. This documentation is your baseline.

Step 2: Go to americanbar.org and use the lawyer referral directory to find a family law attorney licensed in your state. Search specifically for attorneys who list cohabitation agreements or domestic partnership contracts in their practice areas. Book a one-hour consultation, which typically costs between $150 and $300. Before that meeting, write down every shared asset, every monthly expense you each cover, and any large purchases you have made together. Bring that list printed or on your phone.

Step 3: Before the attorney appointment, have the direct conversation with your partner using the script above. Do not wait until after the consultation to bring it up. The goal is to arrive at the attorney together, or at minimum with your partner already aware and on board. If the conversation goes badly, that is also important information, and it is better to have it now than after another year of shared rent payments with no legal protection.

You deserve to know this before you need to know it. Most people learn it the way Maya did, standing in an apartment that had their cat and their memories and someone else’s name on the door.

Do not be most people.