How To Buy a House With Friends in 2025 Without Ruining the Friendship

Pooling money with a friend to buy a house sounds like a financial cheat code — suddenly that down payment is achievable, and a mortgage that seemed absurd alone becomes manageable split two or three ways. In 2025, with median home prices hovering near $400,000 nationally and well above $600,000 in coastal metros, co-buying with a friend isn’t a fringe idea anymore. It’s a rational strategy. But here’s the hard truth: buying a home with a friend is legally and financially more complex than buying one with a spouse, because the law gives you fewer default protections. Without meticulous upfront planning, you’re not building wealth together — you’re building a lawsuit.

Joint and Several Liability: The Fact That Changes Everything

If you take away one thing from this article, let it be this: on a shared mortgage, the lender can pursue either borrower for 100% of the debt — not just their half. This is called joint and several liability, and it is the standard structure on virtually every co-signed residential mortgage in the United States. If your friend loses their job, develops a gambling problem, or simply ghosts you and moves to Portugal, the bank will not chase them down. They will demand full payment from you, and if you can’t pay, they’ll foreclose on the property and wreck your credit for seven years.

There is no mortgage product widely available to consumers that limits each borrower’s obligation to their ownership percentage. The bank doesn’t care about your handshake agreement that you’re each responsible for half. Understand this reality before you sign anything.

The DTI Anchor: How a Co-Buy Haunts Your Future Borrowing

Here’s a consequence people rarely think about until it’s too late. When you co-sign a mortgage, that entire monthly payment counts against your debt-to-income ratio on every future loan application — car loans, credit cards, and especially any subsequent mortgage. It doesn’t matter if your co-owner makes every single payment on time from their own bank account. As far as your next lender is concerned, you owe 100% of that mortgage.

Say you co-buy a $400,000 house with a friend. Three years later, you meet a partner and want to buy a place together. That original mortgage — let’s call it $2,400 a month — sits on your credit report and inflates your DTI. You may not qualify for the second home at all, or you’ll qualify for far less than you otherwise would. This “DTI anchor effect” is one of the most common reasons co-buying arrangements collapse: one person’s life moves forward, and the shared mortgage becomes a financial anchor they can’t drag any further.

Tenants in Common: The Right Structure for Friends

How you hold title matters enormously. The two primary options are joint tenancy and tenancy in common (TIC). For friends, tenancy in common is almost always the correct choice. Here’s why:

• Unequal ownership shares. TIC lets you own 60/40, 70/30, or whatever reflects your actual financial contributions. Joint tenancy forces equal shares.
• Independent inheritance rights. Your share passes to your chosen beneficiaries — your family, your partner, your estate. Joint tenancy includes a right of survivorship, meaning if you die, your share automatically goes to your co-owner. That might be fine for married couples. For friends, it’s rarely what either party intends.
• Separate transferability. You can sell or encumber your TIC share independently (though practically, finding a buyer for a partial interest is difficult without a co-ownership agreement in place).

Make sure your title is recorded correctly at closing. Fixing this after the fact is possible but involves additional legal fees and a new deed.

The Co-Ownership Agreement: Non-Negotiable

A co-ownership agreement is the single most important document in a friend co-buy — more important, in practical terms, than the mortgage itself. Have a real estate attorney draft one before you close. It should address, at minimum:

• Ownership percentages and financial contributions. Who paid what toward the down payment, and how that’s reflected in equity.
• Monthly expense responsibilities. Mortgage, property taxes, insurance, HOA fees, maintenance, and how shortfalls are handled.
• Right of first refusal. If one party wants out, the other gets first crack at buying their share at fair market value before it’s offered externally.
• Buy-sell (shotgun) clause. One owner names a price; the other must either buy at that price or sell at that price. This mechanism forces fairness because the person naming the price doesn’t know which side of the deal they’ll end up on.
• Exit timeline and forced-sale triggers. What happens if you can’t agree? Typically the agreement provides for sale after a set negotiation period, with proceeds split per ownership percentages.
• Occupancy rules. Can a romantic partner move in? Do they pay rent? What about subletting?
• Renovation and major repair consent thresholds. Perhaps anything under $2,000 requires only notice, while anything over requires written consent from all owners.
• Dispute resolution. Mediation first, then binding arbitration. Litigation should be the absolute last resort — it’s expensive and destroys friendships faster than anything.

Tax Traps: The IRS Form 1098 Problem

Each year, your mortgage servicer issues IRS Form 1098 reporting mortgage interest paid. That form is tied to one Social Security number — typically the first borrower listed on the loan. Only the person whose SSN is on the 1098 gets the automatic documentation for claiming the mortgage interest deduction. The other co-owner can still claim their proportional share, but they’ll need to attach a statement to their return explaining the arrangement, and they should have a written agreement specifying the split.

The practical advice: the 1098 should be issued under the SSN of the co-owner who benefits most from the deduction — generally the person with the higher taxable income who itemizes rather than taking the standard deduction. Sort this out before closing, not during a tense conversation in March.

Community Property States: The Spouse You Didn’t Plan For

If you co-buy in California, Arizona, Texas, Nevada, Washington, Idaho, Louisiana, New Mexico, or Wisconsin, pay close attention. These are community property states, and if your co-owner later marries, their new spouse may acquire a community property interest in the home. Suddenly you have a third owner you never agreed to — one who has legal rights to the property.

Your co-ownership agreement should include a clause requiring any future spouse to sign a waiver disclaiming any interest in the property. Better yet, your co-owner’s prenuptial agreement should explicitly address the co-owned home. This feels awkward to discuss before anyone is even dating, but it’s infinitely less awkward than a partition lawsuit triggered by your co-owner’s divorce.

Title Insurance and Escrow: Know What You’re Paying For

First-time buyers often sign closing documents without understanding two critical protections. Title insurance is a one-time premium that protects you against defects in the property’s title — undisclosed liens, forged documents in the chain of title, unknown heirs with claims. You’ll typically buy a lender’s policy (required) and should also buy an owner’s policy (optional but strongly recommended). Escrow is a neutral third party that holds funds and documents during the transaction, ensuring nobody gets paid until all conditions are met. In a co-buy, escrow also ensures the deed is recorded with the correct ownership structure. Don’t skimp on either.

The Actionable Playbook

If you’re seriously considering buying with a friend, here’s your step-by-step path forward:

1. Full financial disclosure. Share credit reports, income documentation, and existing debts. If this conversation is uncomfortable, you are not ready to co-own property.
2. Get pre-approved together so you understand your combined borrowing power and how the mortgage affects each person’s DTI.
3. Hire a real estate attorney — not your friend’s cousin who does personal injury work — to draft a co-ownership agreement before you make an offer on a property.
4. Title as tenants in common with ownership percentages reflecting actual contributions.
5. Agree on the 1098 allocation in writing and revisit it annually if circumstances change.
6. Open a joint bank account funded equally (or proportionally) for mortgage payments, taxes, insurance, and a maintenance reserve.
7. Review your agreement annually. Life changes. Your document should accommodate that.

Buying a home with a friend can be a genuinely smart financial move — but only if both parties treat it as a business arrangement first and a friendship second. The friends who stay friends are the ones who put everything in writing before the keys change hands, not the ones who assume goodwill is a substitute for a contract.

Disclaimer: The information provided in this article is for informational purposes only and should not be considered financial or legal advice. Laws and lending criteria vary significantly between states. We always recommend consulting with a qualified real estate attorney and financial advisor before entering into a property purchase or financial arrangement with another party.