Buying With Friends Or Partner

Buying with Friends or a Partner: Legal Co-Ownership Agreements

Two people agree to buy a home together. They split the down payment, split the mortgage, and split the ongoing costs. The arrangement makes homeownership affordable in a market where neither could qualify alone. They don't write anything down because they trust each other completely.

Three years later, one person wants to sell. The other doesn't. Or one person loses their job and can't pay their share. Or one person gets married and their new spouse wants them to move. Or one person dies, and their half of the property passes to an heir neither expected.

The trust was genuine. The absence of documentation made the trust irrelevant when it mattered.

Co-ownership of real estate between unmarried parties—friends, romantic partners, siblings, business partners—is a legitimate and increasingly common path to homeownership. It is also a structure that creates complex legal relationships that neither party fully understands without explicit documentation, and that produces predictable conflicts when circumstances change without a predetermined resolution mechanism.

THE LEGAL DEFAULT: WHAT HAPPENS WITHOUT A WRITTEN AGREEMENT

When two people buy a home together, the deed specifies the form of ownership. The two primary options:

Joint tenancy with right of survivorship: Each owner holds an equal, undivided interest. If one owner dies, their interest passes automatically to the surviving owner—outside of probate. Neither owner can independently sell or transfer their interest without severing the joint tenancy (which converts it to tenants in common). Both owners must agree to any sale of the whole property.

Tenancy in common: Each owner holds a defined percentage interest (which doesn't have to be equal) that they can sell, mortgage, or bequeath independently. If one owner dies, their interest passes according to their will or state intestacy law—not automatically to the co-owner. A tenancy in common owner can force a sale through a partition action if the co-owner won't agree to sell voluntarily.

Most co-buyers who haven't thought carefully about this receive tenancy in common by default if they specify unequal contributions, or joint tenancy if the title company's default form is used in their state. Neither may match what they actually intended.

THE PARTITION ACTION: THE NUCLEAR OPTION

The partition action is the legal remedy when co-owners of tenancy in common property can't agree on what to do with it. Either owner can file in court to force either a physical division of the property (impossible for a single-family home) or a forced sale at auction with proceeds distributed according to ownership percentages.

A partition sale frequently produces below-market results. Courts aren't real estate agents; auction conditions don't favor sellers. The legal costs of a partition action—attorney fees, court costs, appraisal—are borne by the estate before distribution.

A co-ownership agreement with a buyout provision prevents the partition action from ever being necessary. It gives the parties a contractual mechanism for resolving disputes without court intervention.

WHAT A CO-OWNERSHIP AGREEMENT SHOULD ADDRESS

A co-ownership agreement (sometimes called a co-habitation agreement, tenancy agreement, or cotenancy agreement) is a private contract between co-owners that governs the ownership relationship. It doesn't appear on the deed and doesn't affect third parties—it binds only the parties who sign it. It should be drafted by an attorney familiar with real estate and contract law in your state.

Key provisions:

1. Ownership percentages and how they're calculated.

If both parties contribute equally—50% of the down payment, 50% of the mortgage—equal ownership is intuitive. If contributions are unequal (one party provides 70% of the down payment), document the percentage each party owns. This percentage governs distributions at sale and buyout calculations.

Also address how ownership percentages change over time if one party makes extra principal payments or contributes more to renovation costs. Does extra contribution change the ownership split? If so, how is it documented and recalculated?

2. Cost-sharing for ongoing expenses.

Specify how mortgage payments, property taxes, insurance, HOA fees, and maintenance costs are split. Are they split proportionally to ownership percentage, or equally? Who is responsible for collecting contributions and making payments? What happens if one party is consistently late?

3. Decision-making for maintenance and improvements.

Who decides when to replace the water heater? Who chooses the contractor? Who can approve a renovation, and what dollar threshold requires joint approval? Ambiguity here creates conflict when the time comes.

4. The buyout provision: the most important clause.

Define clearly what happens if one party wants to exit the ownership:

- The departing party gives written notice of intent to sell their interest. - The remaining party has a defined right of first refusal period (typically 60 to 90 days) to purchase the departing party's interest at a specified price or method. - The buyout price is established by an agreed method: a mutually agreed appraisal, the average of two independent appraisals, or a formula tied to recent comparable sales. - If the remaining party cannot or chooses not to exercise the right of first refusal within the defined period, the departing party can sell to a third party—with the remaining party's right of approval over the new co-owner (important for friends who didn't intend to co-own with a stranger). - If neither party wants to buy the other out, the parties agree to list the property for sale within a defined period.

5. Trigger events for mandatory resolution.

Define the circumstances that trigger the buyout or sale process beyond voluntary departure: death of a co-owner (who inherits, and on what terms?), marriage (does a new spouse become a co-owner?), bankruptcy of a co-owner, extended non-payment of mortgage obligations, or relocation beyond a certain distance.

Death is the most frequently overlooked trigger. If one co-owner dies and their 50% interest passes by intestacy to a sibling, the surviving co-owner is now co-owning a home with someone they've never met. The agreement should specify whether the estate can inherit the interest (with buyout rights triggered) or whether the interest must be offered to the surviving co-owner first.

6. Mortgage default and protection provisions.

Both parties are on the mortgage and equally responsible for the full payment. If one party stops paying, the other must cover the payment or face credit damage and foreclosure risk. The agreement should specify: what constitutes a payment default, the cure period, the other party's right to make the payment and be reimbursed, and the mechanism by which repeated default triggers a mandatory buyout or sale.

7. Dispute resolution.

Specify that disputes arising under the agreement are resolved through mediation before litigation, and in binding arbitration if mediation fails. This prevents a property dispute from immediately becoming expensive courtroom litigation.

THE FINANCING REALITY

Most conventional mortgages require all co-borrowers to appear on the loan. Both parties' credit scores and debt-to-income ratios affect loan approval and rate. The lower credit score among co-borrowers often drives the loan's pricing. One person's financial problems become both people's mortgage problem.

If one co-owner's name is not on the mortgage (because their credit or income was a disqualifying factor), they are a co-owner on the deed with no liability on the mortgage—which raises complex questions about their equity position and obligations that the co-ownership agreement must address explicitly.

WHY "TRUST" IS NOT A SUBSTITUTE

People who buy property with someone they trust deeply often resist written agreements as an implication of distrust. The logic inverts the relationship between agreements and trust. A written agreement doesn't mean you don't trust your co-owner—it means that when circumstances change (and they will), you've established rules that don't require renegotiating from scratch under emotional pressure.

The agreement protects both parties equally. It protects the person who wants to sell from being trapped by a reluctant co-owner. It protects the person who wants to stay from being forced out by a departing one. It protects both from the uncertainty of what happens if one of them dies, divorces, or experiences a financial crisis.

Relationships are built on trust. Property co-ownership is a legal and financial structure that works best with clearly documented rules—regardless of how much trust exists between the parties when they sign the deed.