How to split a mortgage as a couple: payment, down payment and who owns the house
Four things to settle when two people buy a home: the monthly payment, an uneven down payment, upkeep, and who owns what. Worked on real numbers, with a note on why the paperwork matters.
Checked November 4, 2026
A mortgage is different from rent in one way that matters. Rent is a cost. A mortgage is a cost and also a way to own something. So the question is not only who pays what each month. It is who owns what at the end. This page is general information, not legal advice. For your state, talk to a real estate attorney.
What the monthly payment is
The Consumer Financial Protection Bureau calls principal, interest, taxes and insurance, known as PITI, the four basic elements of a monthly mortgage payment. Taxes and insurance often go through an escrow account that the servicer pays from. Both can change from year to year, and when they do your payment changes too.
Add the costs that are not in the payment: upkeep and repairs. Navy Federal gives a rule of thumb of 1% to 2% of the purchase price a year for routine upkeep, and says the real figure depends on the home's age, condition and location. Treat it as a monthly line you both put money into, not a surprise.
Splitting the monthly payment
Use the same two methods as for rent. Equal is simple. By income puts the same share of each pay into the house, which is the idea behind splitting bills by income.
Example: $2,600 payment plus a $400 repairs fund
Take-home pay is $5,200 and $3,400, so $8,600 together. The shares are 60.5% and 39.5%. The housing cost is $2,600 for principal, interest, taxes and insurance, plus $400 into a repairs fund, $3,000 in all.
| Way | Higher earner | Share of own pay | Other | Share of own pay |
|---|---|---|---|---|
| Equal | $1,500 | 29% | $1,500 | 44% |
| By income | $1,814 | 35% | $1,186 | 35% |
Equally, the house takes 29% of one pay and 44% of the other. By income, it takes 35% of each. The lower earner pays $314 a month less and the higher earner $314 more. If the 44% looks too heavy for one of you, that is the signal to use the income split, or to look at the fair split calculator and uneven incomes.
When one of you puts in more of the down payment
This is where couples get stuck. One of you has savings, or a gift from a parent, and the other does not. Nolo describes two usual fixes for an uneven down payment: the one who put in more gifts the other part of the house, or, more typically, lends the other their share. A third is to let ownership follow the money.
Example: $40,000 and $10,000
Together that is a $50,000 down payment. Half would be $25,000 each, so the first partner put in $15,000 more than half.
| Choice | First partner | Second partner | What it means |
|---|---|---|---|
| Own it 50/50, extra is a gift | 50% | 50% | The $15,000 is not paid back |
| Own it 50/50, extra is a loan | 50% | 50% | The second partner owes $15,000, paid back on a schedule you write down |
| Ownership follows the down payment | 80% | 20% | $40,000 of $50,000 is 80%, $10,000 is 20% |
| Down payment back first on a sale | $40,000 first | $10,000 first | Then the rest is divided as you agreed |
There is no right one. A gift keeps ownership simple and is generous. A loan keeps the books even. Ownership by down payment is exact, but then you also have to decide whether the monthly payments count toward the shares or only the down payment does. If part of the down payment is a gift from a family member, see our mortgage gift letter template. For how to build the fund in the first place, see saving for a house.
Upkeep and repairs
The first rule is to separate the repairs fund from the payment. Put the same split into it each month that you use for the mortgage, and pay repairs from it. In the example above, $400 a month is $4,800 a year. Navy Federal's 1% to 2% rule would suggest that on a home bought for $240,000 to $480,000.
- Routine upkeep comes out of the repairs fund.
- Big repairs (a roof, a furnace) may be more than the fund holds. Decide in advance how you cover the gap: both of you by your usual split, or from a cushion.
- Improvements such as a new kitchen are a choice, not a repair. Decide who pays, and whether the one who pays gets credit if you sell. Nolo lists repairs among the ongoing costs a co-ownership agreement should cover.
When one of you owns the house and the other pays toward it
Sometimes only one partner is on the loan and the title, and the other pays part of the housing cost. That can mean two different things, and they look the same on a bank statement.
| Like rent | Building a share | |
|---|---|---|
| What the money buys | A place to live | A part of the house |
| Ownership share | None | Whatever you agree and write down |
| Paid back if you split up | No | As the agreement says |
| Fits | A partner who moves in and pays a fair amount toward costs | A partner who wants the house to be theirs too |
If it is like rent, the amount can be the by-income share of the housing cost, or a flat amount you both think is fair. If it is a share, you need the paper to say so. Without it, money paid toward a house you do not own may not turn into ownership just because you paid.
A middle path is to count only the principal part of each payment as building a share, since principal is the part that pays down the loan, and treat interest, taxes, insurance and repairs as the cost of living there. Your lender's loan schedule shows how much of each payment is principal.
Why the title matters
Title is how the house is legally held. The bank statement shows who paid. The title shows who owns. Two forms come up for couples.
| Tenants in common | Joint tenants | |
|---|---|---|
| Shares | Can be unequal, such as 80/20 | Equal |
| If one dies | That share goes to their estate unless a will says otherwise | Their share passes to the surviving owner |
| Fits | An uneven down payment or uneven contributions | Couples who want the survivor to keep the house and have equal shares |
If your down payments were $40,000 and $10,000, tenants in common is the form that lets shares reflect that, if you want them to. If you want the survivor to keep the house, joint tenancy or a will or other paper does that, and a real estate attorney can say which works where you live.
Put it in writing
Nolo says a co-ownership agreement is where unmarried couples settle reimbursement of the down payment, how ongoing costs such as the mortgage, property tax, insurance and repairs are divided, how profits or losses are split on a sale, and how major decisions are made. If you marry later, ask an attorney whether the agreement still holds.
A short checklist for the paper:
- Who is on the loan and the title, and in what form.
- What each put in as a down payment, and whether it is a gift, a loan or a share.
- How you split the payment, taxes, insurance and repairs, and when you redo it.
- What happens if one of you wants out: a buyout, a sale, or a set time.
- What happens if one of you cannot pay for a while.
Have a real estate attorney draw it up or look it over. It costs something now, and it saves arguing later.
Keeping the tally after you sign
The hard part is the next thirty years. When one of you pays the mortgage and the other sends a share, or one pays the roof and the other owes half, it helps to see the running total. Our paying a partner back guide covers the habit.
When Wonderful is the wrong pick
Wonderful is built for couples who keep their own money, and for one person. It splits shared costs evenly, by income or any way you choose, and keeps a running total of who owes whom. It does not draw up ownership paperwork or give legal advice, so the title and the written agreement are for you and an attorney. It is not free after a free week: $14.99 a month or $99 a year for the household. It runs in the browser, with no phone app. For three or more people splitting a house, a bill-splitting app is the better fit. See the apps to split bills.
Questions people ask
How do unmarried couples split a mortgage?
Most pick one of two ways: half each, or by income so each pays the same share of their own pay. The monthly split is only part of it. Settle the down payment, upkeep, and who owns what in writing too.
Should we split the mortgage 50/50 or by income?
Fifty-fifty works when pay is close. When it is not, a split by income puts the same share of each pay into the house. On a $3,000 housing cost and pays of $5,200 and $3,400, 50/50 takes 29% of one pay and 44% of the other. By income takes 35% of each.
What if one of us puts in more of the down payment?
Decide what the extra is. Nolo describes two common ways: the extra is a gift of part of the house, or, more typically, a loan from the partner with more money. Another way is for ownership shares to follow what each put in. Write down which one you chose.
Who pays for repairs on a house two people own?
Pick it before the first leak. Many couples split repairs the same way as the mortgage, from a shared repairs fund. Navy Federal gives 1% to 2% of the purchase price a year as a rule of thumb for routine upkeep.
What if only one of us is on the title?
Then the law usually looks at the title, not at who paid the bills. Paying toward a house you do not own may build no share unless you agreed otherwise in writing. This is general information, not legal advice. A real estate attorney can say what applies in your state.
What is the difference between tenants in common and joint tenants?
Tenants in common can own unequal shares, and a share that is left at death goes to the owner's estate unless a will says otherwise. Joint tenants share equally, and a joint owner's share passes to the survivor. Nolo adds that joint tenancy usually ends when one owner transfers their interest.
Do we need a written agreement if we are not married?
Nolo says a co-ownership agreement is where unmarried couples settle the down payment, ongoing costs such as the mortgage, taxes, insurance and repairs, and what happens on a sale. If you marry later, ask an attorney whether the agreement still holds.
What does a monthly mortgage payment include?
The CFPB calls principal, interest, taxes and insurance, known as PITI, the four basic elements. Taxes and insurance often ride in an escrow account, and both can change from year to year, which changes your payment.
Is rent paid to a partner who owns the house the same as paying the mortgage?
Not in law. Money paid to the owner can be like rent, which builds no share, or a contribution toward ownership, which only counts if you both agreed it does. Put the choice in writing.
Can we change the split later?
Yes, and you should when pay changes, one of you drops to part time, or the loan is refinanced. Redo the math and update the written agreement.
Sources
6 sources · read November 4, 2026
Every number on this page comes from consumerfinance.gov, navyfederal.org and nolo.com. If a source has changed since, the source is right.
- 1Consumer Financial Protection Bureau: What is PITI? (principal, interest, taxes and insurance as the four basic parts of a monthly mortgage payment; escrow for taxes and insurance)consumerfinance.gov
- 2Consumer Financial Protection Bureau: What is a mortgage escrow account? (taxes and insurance can change from year to year, and so does the payment)consumerfinance.gov
- 3Navy Federal: What's the true cost of owning a home? (1% to 2% of the purchase price a year for routine upkeep)navyfederal.org
- 4Nolo, The Living Together Book: How two unmarried people can co-own or take title to a homenolo.com
- 5Nolo, The Living Together Book: Preparing a house co-ownership agreement (down payment, ongoing costs, repairs, selling)nolo.com
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Wonderful gives general information. It isn't a financial or tax advisor.