How Do Co-Buyers Typically Split a Down Payment?
Two people buying a home together rarely have identical savings, which means the down payment is often the first place their finances diverge — and the first thing worth putting in writing before it becomes a source of tension later.
The short answer
Co-buyers generally split a down payment either evenly, proportionally to their ownership share, or in whatever amount each person happens to have available, with the specific split documented for the lender and, ideally, reflected in how ownership is structured. Lenders typically care less about who contributed what and more about being able to verify where the total down payment came from, since unusually large deposits generally require a documented source.
Common approaches
- Even split. Each co-buyer contributes the same dollar amount, which tends to work well when incomes and savings are similar and ownership will be equal.
- Proportional to ownership. Contributions are sized to match agreed ownership percentages, so someone putting in 70% of the down payment holds a 70% share, which pairs naturally with holding title as tenants in common rather than joint tenancy.
- Unequal but flexible. One buyer contributes more of the down payment while the other takes on a larger share of the monthly payment or ongoing costs going forward, an arrangement that works but needs clear documentation of what each side agreed to.
Documenting the source
Lenders generally require paperwork showing where down payment funds came from, especially for amounts that don’t match a borrower’s typical account activity. If one co-buyer is contributing funds gifted from a family member, that gift usually needs its own documentation showing it isn’t a loan that has to be repaid, since undisclosed debt used for a down payment can affect how the lender evaluates the loan. This documentation requirement applies separately to each co-buyer, so a mix of personal savings, a gift, and a withdrawal from an investment account can each need their own paper trail even though the money ends up in the same account before closing.
Why unequal contributions should be tied to ownership
When contributions aren’t equal, it’s worth deciding upfront whether ownership percentage will track the dollars each person put in, or whether the co-buyers are treating the down payment as a shared cost regardless of who covered more. Without a written decision, disagreements can surface later, particularly if the property is sold and the proceeds need to be divided — a moment when vague assumptions about who “put in more” are hard to resolve fairly without documentation from the time of purchase.
Putting it in writing
A simple written record made near the time of purchase, spelling out each person’s contribution and how it relates to ownership share, tends to prevent disputes far more effectively than a verbal understanding. This doesn’t need to be an elaborate document; it can be as straightforward as a signed statement referenced in a broader written agreement covering the rest of the shared arrangement.
The takeaway
However co-buyers decide to split a down payment, the arrangement holds up best when it’s documented at the time of purchase and tied clearly to ownership share, rather than left as an informal understanding that each person remembers differently a few years down the road.