Can friends buy a house together on one mortgage? Yes, absolutely.
With home prices near all-time highs, the concept of "co-buying" has exploded in 2026. Unmarried couples, siblings, and platonic friends are realizing that pooling their incomes is the smartest way to bypass strict affordability limits and break into the real estate market.
However, putting two or three unrelated people on a 30-year legal document requires serious math. Here is exactly how lenders view co-buyers.
How Lenders Combine Your Incomes (DTI)
The biggest advantage of co-buying is the Debt-to-Income (DTI) ratio. Lenders will add all borrowers' gross incomes together to form a "Household Income," and add all monthly debts (car loans, student loans, credit cards) together to form "Household Debt."
If Borrower A makes $60k but has high student loan debt, and Borrower B makes $50k with zero debt, combining them drastically lowers the overall DTI ratio, unlocking massive purchasing power that neither could get alone.
The Credit Score Warning
While combining income is great, credit scores do not average out. Lenders pull three credit scores for every borrower and take the middle score for each person.
The rule: The lender will base the entire interest rate on the LOWEST middle score of the group.
If you have an 800 credit score, but your friend has a 620, the lender will price your mortgage as if you both have a 620. If one friend has terrible credit, it might actually be cheaper to leave them off the mortgage entirely.
Joint Tenancy vs. Tenancy in Common
When you close on the house, the title company will ask how you want to hold the deed. You have two options:
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1. Joint Tenancy
Everyone owns an equal share (50/50). If one person dies, their share automatically passes to the surviving friend/partner. (Best for committed partners).
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2. Tenancy in Common
You can own unequal shares (e.g., you put in more cash, so you own 70%, your friend owns 30%). If someone dies, their share goes to their family, not the co-owner. (Best for friends and investors).
Calculate Your Combined Power
Combine your annual incomes and your monthly debts, and plug them into our Affordability Underwriting tab to see your massive combined purchasing power.
Run Co-Buying Affordability →