Your Name Isn't on the Mortgage? Doesn't Mean You Don't Own the House

Quick reality check before anything else: who's on the mortgage and who's on the deed are two completely different questions, and they don't have to have the same answer. The mortgage is about who owes the debt. The deed is about who owns the house. Married couples can fudge this distinction because divorce court will sort out the property regardless of whose name is where. Unmarried couples don't get that backstop — so getting this structure right isn't paperwork trivia, it's the thing that determines whether a breakup or a death turns into an inconvenience or a legal nightmare.

This piece assumes you've already decided to buy with your partner and just want the mechanics right. (If you're still weighing whether that's a good idea in the first place, that's a separate question — this one's about the "how," not the "should you.") And you're not alone in asking: unmarried couples made up 6% of U.S. home buyers in 2025 nationally, and a notable 13% among younger Millennials — per the National Association of Realtors' 2025 Home Buyers and Sellers Generational Trends Report — which tracks with a generation getting married later while home prices don't wait around.

Mortgage vs. deed: the split that trips people up

The mortgage (or more precisely, the promissory note) is a personal promise to repay a debt. Whoever signs it is on the hook to the lender, full stop, regardless of what happens to the relationship or the house. Lenders don't care about your relationship status — they care about income, credit, and debt-to-income ratio.

The deed is the document that says who legally owns the property. It's recorded with the county, and it's what determines who gets to sell, who gets equity, and what happens to the property when someone dies.

These can — and often should — have different people on them than you'd assume:

Both partners can be on the mortgage and both on the deed (the most common setup for couples buying together).
One partner can be on the mortgage alone, but both on the deed — common when one partner's credit or income won't qualify, but you both want ownership. FHA guidelines explicitly allow this: a non-borrowing partner can hold title while only one person applies for and is legally responsible for the loan. Conventional loans generally allow it too, though practices vary by lender.
One partner can be on the deed alone even though both are on the mortgage — this one is the trap. It means one of you can be personally liable for a loan on a house you don't legally own a share of. Don't do this by accident; if it happens, it's usually because someone didn't ask the right question at the closing table.

The mismatch itself — not knowing which of these situations you're actually in — is one of the most common ways unmarried couples get burned. People assume "we're both paying for it, so we both own it," and that is not automatically true. Ownership is determined by the deed, not by who Venmo'd the mortgage servicer last month.

If only one of you can qualify for the loan

If one partner's credit or income doesn't clear underwriting, the other can still be added to the deed as a co-owner — the lender's underwriting only governs the note, not who holds title. State law determines whether that non-borrowing owner also has to sign the security instrument (the mortgage/deed of trust itself, as opposed to the note) — in some states everyone with an ownership interest signs the mortgage document even if they're not a borrower on the note, without becoming personally liable for the debt. Ask the loan officer and closing attorney directly which applies in your state; don't assume.

The tradeoff worth naming out loud: whoever isn't on the loan is also not building payment history that helps their own credit or future borrowing power, and if the relationship ends, refinancing them onto the loan later means requalifying from scratch, at whatever rate exists then — not the rate you locked in today. If your plan is "add them to the loan later," write down when and under what conditions, because "later" has a way of never arriving.

If both incomes look attractive together, know that lenders on a joint application will generally underwrite to the lower of the two credit scores, not an average — so combining finances doesn't always mean combining your best numbers. Confirm this with your specific lender, since overlay policies vary.

The deed: joint tenancy vs. tenancy in common

Once you know who's going on the deed, you have to pick how you're going to hold title together. For unmarried couples, it comes down to two real options.

Joint tenancy with right of survivorship (JTWROS)

Ownership is automatically equal — 50/50 for two people, no matter who put in more cash.
On death, the surviving partner automatically inherits the deceased partner's share, outside of probate. No will needed for this piece; it happens by operation of the deed itself.
On breakup, each partner has an equal claim on the equity regardless of who paid for what — which is exactly why unequal contributors often shouldn't default into this option without a side agreement.

Tenancy in common (TIC)

Ownership percentages can be anything you want — 50/50, 70/30, 90/10 — and get spelled out explicitly on the deed itself, as public record in the property's chain of title.
On death, your share does not automatically go to your partner. It goes into your estate and gets distributed according to your will (or state intestacy law if you don't have one) — which could mean your parents or siblings end up owning a piece of your house with your ex-partner-who's-not-an-ex-because-you-never-broke-up-you-just-died. Grim, but real, and it's the single biggest reason couples who choose TIC also need an actual will.
On breakup, each partner keeps their documented percentage — which is the whole point if your contributions weren't equal.

Most attorneys point unmarried couples with unequal contributions toward tenancy in common, specifically because it lets the deed reflect reality instead of forcing a 50/50 fiction that only holds up if you never break up or one of you never dies with other family in the picture. Couples who consider their finances fully merged and trust the relationship's endgame sometimes prefer joint tenancy for the death-without-probate simplicity — Nolo's rundown of the tradeoff is a decent plain-language primer if you want more detail before talking to an attorney. Either way, this should be a deliberate choice you make with your closing attorney, not whatever the title company defaults to if nobody says anything (which is usually joint tenancy or tenancy in common depending on state default rules — ask, don't assume).

Making unequal down payments fair in the ownership split

This is where a lot of couples get vague, and vague is expensive later. If one partner puts down $60,000 and the other puts down $15,000, "we're 50/50 partners" is a nice sentiment and a bad ownership structure.

The mechanics, roughly:

Calculate each partner's equity contribution — down payment plus any closing costs each person actually paid, as a percentage of the total upfront cash into the deal.
Set the tenancy-in-common percentages to match. If Partner A put in 80% of the cash and Partner B put in 20%, the deed can say 80/20. It's just a matter of stating it — the co-owners state their specific share percentages and the deed reflects it.
Decide how ongoing mortgage payments factor in. Down payment is a one-time snapshot; the mortgage gets paid every month for years, and if one partner covers more of that too, their equity stake should arguably keep growing relative to the other's. Couples handle this two ways: either they split monthly payments proportional to the agreed ownership percentage (so the percentage never needs to move), or they track actual contributions over time and true up the ownership split later — which requires actual records, not memory. This is exactly the kind of thing that should be spelled out in a written agreement rather than assumed.
Get it notarized and recorded, not just texted to each other. An ownership percentage that only exists in a group chat doesn't hold up when it matters.

One nuance worth flagging: an unequal ownership percentage on the deed is a separate thing from an unequal share of liability on the mortgage. If both partners sign the note, both are 100% liable to the lender for the full loan regardless of what the deed says — the lender doesn't care that you're only a 20% owner, they'll come after either signer for the whole payment if it's missed. The deed percentage governs the split of equity and proceeds; the note governs the split of debt. Those are two different documents doing two different jobs, which is the whole theme of this article.

What a cohabitation/property agreement actually needs to say

A cohabitation agreement (sometimes called a property agreement, domestic partnership agreement, or co-ownership agreement) is the document that fills the gap marriage would otherwise fill automatically. It's not romantic, it's infrastructure. CoBuy's 2026 co-owning report found that 96% of co-buyers surveyed said they needed help figuring out their co-ownership agreement, and nearly a third of co-buying groups go into the purchase without having even decided how they'll split ownership — which is a bad way to find out you disagree.

At minimum, a real agreement should specify:

Ownership percentages, and exactly how they were calculated (tie it back to the down payment/contribution math above, in writing, with numbers).
How ongoing costs get tracked — mortgage, property tax, insurance, HOA dues, repairs, renovations. Who pays what, and what happens if someone falls behind or covers more than their share for a stretch (does it get repaid, does it shift the ownership percentage, does it just get logged for a future accounting?).
A buyout formula, decided now, not during a breakup when everyone's furious. Common approaches: an independent appraisal at the time of separation, with the departing partner bought out at their ownership percentage of the appraised equity, minus remaining mortgage balance and an agreed timeline to actually get the cash (refinancing to pull the buying partner's name off and pay out the other takes time — refinancing typically costs 2–5% of the loan balance in closing costs and weeks to close, not days).
What happens if neither person wants to buy the other out, or can't afford to — usually this defaults to selling the home and splitting proceeds per the ownership percentage. Spell out who picks the agent, how to handle disagreement over listing price, and a deadline to list if you can't agree.
What happens if one partner's name isn't on the mortgage but they are an owner — specifically, what happens to their equity share if the relationship ends and the borrowing partner refinances or the loan gets paid off entirely with mostly their own money going forward. This is the scenario most agreements skip and most disputes come from.
What happens on death, especially under tenancy in common, since that's the structure that doesn't auto-transfer to the survivor. Reference the will, don't rely on the agreement alone to handle inheritance — a cohabitation agreement and a will are both doing separate jobs here too.
Dispute resolution — mediation or arbitration before either of you can rack up legal fees, if you want to keep that as a first option rather than an immediate lawsuit.

Have this drafted or at least reviewed by a real estate or family law attorney in your state — a generic template pulled off the internet is better than nothing, but state law around unmarried cohabitants' property rights varies (some states recognize implied contracts or "palimony"-style claims between unmarried partners, most require an explicit written agreement to protect a non-owner's contributions at all). FindLaw's overview of cohabitation property rights is a reasonable starting point for understanding what's at stake before you sit down with a lawyer, but it's not a substitute for one who knows your state.

What a quitclaim deed does and doesn't fix later

Worth knowing now, before you need it: if you ever need to remove a partner from the deed (say, after a buyout), a quitclaim deed transfers their ownership interest — but it does nothing to the mortgage. If both partners are on the loan, both are still personally liable for it even after one quitclaims away their ownership stake, unless the lender formally releases them — which generally means the remaining partner refinances into their name alone, or in the rare case of an assumable loan (FHA, VA, USDA), goes through a formal loan assumption with release of liability. Conventional loans are typically not assumable. Signing away the house on paper while your name is still on the note is a real trap people fall into post-breakup — don't let "we handled it" mean "we did the deed but not the debt."

The one-paragraph version

Mortgage = who owes the bank. Deed = who owns the house. They don't have to match, but you need to know exactly what your situation is, on purpose, not by accident. If your down payments were unequal, use tenancy in common with percentages that reflect it, spelled out on the deed. Get a written cohabitation agreement covering contributions, a buyout formula, and what happens on breakup or death before you need it, not after. And remember a quitclaim deed only ever handles the ownership side — the mortgage debt needs its own fix.

Sources

All sources accessed August 16, 2026. Laws on unmarried cohabitants' property rights vary significantly by state — nothing here is legal advice; confirm specifics with a real estate attorney licensed in your state before finalizing an ownership structure or agreement.