Should You Buy a Home With a Friend or Family Member?

TL;DR: Buying a home with a friend or family member can work financially — 24% of buyers under 40 purchased with someone other than a spouse in 2023, per the National Association of Realtors. The arrangement only holds up long-term if you put ownership percentages, a buyout formula, and an exit timeline in writing before closing, not after a disagreement starts.

_Last reviewed: August 2026 · 8 min read_

Splitting a mortgage payment with a sibling or a close friend sounds simple until someone wants to sell, one person's credit dips, or a $9,000 roof repair shows up unannounced. The math can work in your favor, but the legal structure has to be right from day one.

Okoniq Property Hub lets co-owners log shared expenses, repair costs, and maintenance history in one place so nobody has to dig through text threads to figure out who paid for what.

How does joint ownership actually work legally?

Joint ownership means you and your co-buyer each hold a legal stake in the property, and the two most common structures are tenancy in common and joint tenancy with right of survivorship. Tenancy in common lets each person own an unequal share — say 60/40 based on down payment contribution — and each share can be willed to someone else separately. Joint tenancy splits ownership evenly and automatically passes to the surviving owner if one person dies, no probate involved.

Most friends and unmarried family members choose tenancy in common because it protects unequal contributions. If you put down $80,000 and your cousin put down $20,000 on a $400,000 home, tenancy in common lets a deed reflect that 80/20 split instead of forcing a 50/50 default. A real estate attorney can draft this into the deed for roughly $500 to $1,500 depending on your state.

What happens to the mortgage if one person can't pay?

Both names on the mortgage means both people are 100% liable for the full loan, not just their share. Lenders don't split responsibility proportionally — if your co-buyer misses three payments, your credit score takes the hit too, and the bank can pursue either of you for the entire balance. This is the single biggest risk in co-buying and the reason a written agreement matters more than a handshake.

Before you sign, run the numbers on debt-to-income ratio for both borrowers, since most lenders want combined DTI under 43%. It also helps to check what you're financing before you're locked in. If the home has an older electrical panel, confirm whether it's 100 or 200 amp service before assuming it'll handle two households' worth of appliances, EV chargers, and window units.

Should you use a cohabitation or co-ownership agreement?

Yes, and it should be signed before you close, not after you move in. A co-ownership agreement spells out who pays for what, how repair costs get split, what happens if one owner wants out, and how disputes get resolved without going to court. Attorneys typically charge $800 to $2,000 to draft one, which is far cheaper than a partition lawsuit that can run $15,000 or more and take over a year.

The agreement should cover a buyout formula (often based on appraised value at the time of exit), a right of first refusal so an outside buyer can't force their way into shared ownership, and a maintenance reserve fund — many co-owners set aside 1% of the home's value annually for repairs. This matters more than people expect, since older homes often carry deferred issues. Before signing, get a full inspection that flags things like foundation cracks that are serious and roof condition, since a $12,000 roof replacement six months after closing turns any casual arrangement tense fast.

| Structure | Tenancy in Common | Joint Tenancy | |---|---|---| | Ownership split | Can be unequal (e.g. 70/30) | Always equal | | On death | Share passes per will/probate | Passes automatically to co-owner | | Best for | Friends, unequal down payments | Married couples, equal partners | | Exit flexibility | Higher — sell your share independently | Lower — requires mutual agreement |

How do you plan an exit before you even move in?

You plan an exit by agreeing in writing on a timeline, a valuation method, and a buyout process before either of you needs one. Life changes — marriage, job relocation, a falling-out — and roughly half of co-buying arrangements between non-married adults dissolve within seven years, according to housing counselors who track these deals. Decide upfront whether the agreement requires a formal appraisal or an average of two independent appraisals to set the buyout price, and give the buying-out party 60 to 90 days to secure financing.

It also helps to keep clean, shared records of every improvement and repair from the start, since those numbers matter when it's time to split proceeds or calculate a buyout. Track anything that adds value, like new roofing or chimney flashing repairs, the same way you'd track a capital improvement for tax purposes.

FAQ

Can you get a mortgage with a non-married co-buyer?

Yes, most conventional lenders allow up to four borrowers on one mortgage, and each person's income and debt count toward qualifying, which can help you afford a larger home than either buyer could alone.

What credit score do you need to co-buy a home?

Lenders typically use the lowest middle credit score among all borrowers to set your interest rate, so a co-buyer with a 620 score can raise your combined rate even if your own score is 780.

Does co-buying affect your ability to buy another home later?

Yes. The full mortgage balance appears on your credit report and counts against your debt-to-income ratio even if you only own 30% of the property, which can limit your borrowing power for a second home.

How do you split property taxes and insurance with a co-owner?

Most co-owners split these proportionally to ownership percentage and pay into a shared account, though some agreements split evenly regardless of ownership share to keep bookkeeping simple.

What if one co-owner wants to rent out their share?

Your co-ownership agreement should address this directly, since most agreements either prohibit unilateral renting or require the other owner's written consent before bringing in a tenant.

This is educational information, not legal or financial advice. Consult a real estate attorney to draft your co-ownership agreement and a CPA or mortgage advisor about how joint financing affects your specific tax and credit situation.