Buying a car together when you aren’t married works, but it takes more deliberate paperwork than most couples expect. Three documents decide everything: the title (who legally owns the car), the loan (who legally owes the debt), and a private written agreement between you (who pays what and what happens if things change). Get all three right before you sign at the dealership, and you avoid the disputes that otherwise wreck both the relationship and the credit scores attached to it.
Putting Both Names on the Title
The title is what the state looks at to decide who owns the vehicle. A verbal understanding about who paid for what means nothing if only one name appears on that document. If you both want ownership rights, both names have to be on the title, and the form of co-ownership you choose controls what happens if one of you dies or walks away.
Joint Tenancy With Right of Survivorship
Joint tenancy means you each own the vehicle equally, and if one of you dies, the other automatically becomes sole owner without probate. The surviving partner takes a death certificate to the DMV and updates the title. Some states require the full phrase “Joint Tenants with Right of Survivorship” on the title application; others use abbreviations or a checkbox. Call your state’s DMV before you file the paperwork so you use the language that actually creates survivorship in your jurisdiction.
Tenants in Common
Tenants in common lets each partner own a specific share, and the shares don’t have to be equal. If one of you contributed 70% of the purchase price, the title can reflect a 70/30 split. When one owner dies, that share passes through their estate under their will or state inheritance law rather than going to the surviving partner. In some states, tenants in common is the default if you don’t specify, so if you want survivorship, you have to affirmatively ask for joint tenancy.
“And” Versus “Or”
The small word between your names on the title carries real weight. In many states, “and” means both owners must sign to sell or transfer the car. “Or” may let either owner act alone, including selling the car without the other’s consent. For unmarried couples, “and” generally offers more protection, since neither of you can unilaterally dispose of the vehicle. Your state’s DMV can tell you exactly how these conjunctions work where you live.
Co-Borrower or Co-Signer on the Loan
Before you walk into a lender’s office, decide whether you’ll both be co-borrowers or whether one of you will be the primary borrower with the other as co-signer. These are different arrangements, and picking the wrong one is expensive to unwind.
A co-borrower applies for the loan as an equal. Both incomes and both credit histories factor into approval, which often means qualifying for a larger loan or a better rate. Both co-borrowers share equal ownership of the vehicle and equal responsibility for the debt.
A co-signer guarantees someone else’s loan. The primary borrower owns the vehicle outright, but the co-signer is fully on the hook if payments stop. The CFPB warns that the lender can come after a co-signer for the full balance without first trying to collect from the primary borrower, including by garnishing wages or filing a lawsuit.1Consumer Financial Protection Bureau. Should I Agree to Co-Sign Someone Else’s Car Loan? All the financial risk, none of the ownership.
If you both want a stake in the car, co-borrowing is almost always the right choice. Co-signing fits a narrower situation: one partner has strong credit and is helping the other qualify for a loan on a car that will belong to that partner alone. If you do co-sign, the only reliable ways out later are refinancing in the primary borrower’s name, paying off the balance, or selling the vehicle.
What a Joint Loan Does to Both of You
When you co-borrow, you don’t each owe half the payment. You each owe all of it. The lender can demand the full monthly payment from either of you if the other doesn’t pay, and no private agreement between you changes that.
The loan shows up on both credit reports. Every on-time payment helps both profiles; every missed payment damages both. A default or repossession stays on both reports and can drag both scores down for years, even if only one of you missed the payment.1Consumer Financial Protection Bureau. Should I Agree to Co-Sign Someone Else’s Car Loan? The lender reports what happened on the account, not whose fault it was.
If the loan defaults, the lender can repossess the vehicle without going to court, so long as the repossession doesn’t involve a breach of the peace.2Legal Information Institute. UCC 9-609 Secured Party’s Right to Take Possession After Default The car can be seized from whichever of you has it, regardless of who missed the payment. If it then sells for less than the remaining balance, both co-borrowers are liable for the deficiency.
Writing a Co-Ownership Agreement
The title tells the state who owns the car. The loan tells the lender who owes the debt. Neither document answers the questions that actually cause fights: who pays for gas, what happens if one of you wants out, how you’ll handle a transmission that goes at year three. That’s what a co-ownership agreement is for.
This is a private contract between the two of you. It doesn’t get filed anywhere. It just needs to be signed by both, ideally notarized, and kept somewhere you can both find it. Think of it as a prenup for the car. Cover at least:
- Payment responsibilities: the percentage each partner contributes to the monthly loan payment, and whether that split is fixed or adjusts if circumstances change.
- Ongoing costs: who pays for insurance, registration, fuel, routine maintenance, and unexpected repairs. A 50/50 split is simplest, but any ratio works if you both agree in writing.
- Daily use: whether you both have unrestricted use of the car, or one of you is the primary driver with scheduled access for the other.
- Breakup plan: how you’ll dissolve co-ownership, whether one partner has first right to buy the other out, how you’ll set a buyout price, and how you’ll handle any remaining loan balance.
- Death provisions: what happens if one of you dies. Even with a tenants-in-common title, the agreement can give the surviving partner the first option to buy the deceased partner’s share from the estate at fair market value.
The agreement doesn’t override the title or the loan. If your partner stops paying and the lender comes after you, this contract won’t shield you from the debt. What it does is give you a written record you can enforce in court if you need to recover money your partner should have contributed. Without one, you’re stuck arguing about verbal promises neither side can prove.
What Happens If You Break Up
Untangling a jointly owned, jointly financed car is harder than most people expect, because the title and the loan are separate instruments and both have to be addressed.
Refinance or Pay Off the Loan
If one of you wants to keep the car, the cleanest path is refinancing in that partner’s name alone. The new loan pays off the original joint loan, and the departing partner is released from liability once the old loan closes. The keeping partner then updates the title to remove the other name. This only works if the partner keeping the car can qualify for a new loan independently.
Paying off the remaining balance in cash accomplishes the same thing without a new loan, but most couples splitting up don’t have that money sitting around.
Sell the Car
If neither of you can afford it alone, selling is the practical option. Any outstanding loan has to be paid off from the sale proceeds before you split what’s left. If the car is worth less than the loan balance, you’re both still responsible for the shortfall. This is where the co-ownership agreement earns its value, by spelling out exactly how remaining debt gets divided.
When You Can’t Agree
Without an agreement, and with both names on the title, a breakup can turn into a standoff. If neither of you will sell and neither will buy the other out, the last resort is a court-ordered partition, where a judge forces the sale of the vehicle. The car typically goes at auction for less than market value, both sides pay legal fees, and any existing loan has to be satisfied before anyone sees proceeds. Partition is the most expensive, least efficient outcome available, which is exactly why the written agreement matters.
Insuring the Car
Most insurers will let unmarried couples share one auto policy if you live at the same address. One shared policy is usually cheaper than two, and it may qualify you for a multi-car discount if you insure more than one vehicle together. Not every insurer writes joint policies for unmarried couples, so you may need to shop around.
If both names are on the title, both of you should be listed on the policy. A co-owner who isn’t listed can create coverage gaps in an accident. And if one of you moves out, that person needs their own policy for any vehicle they take, or needs to be removed from the existing policy if they leave the car behind.
Consider GAP Insurance
In the early years of a car loan, the vehicle’s value drops faster than the loan balance. If the car is totaled or stolen during that stretch, standard auto insurance pays only the car’s current market value, not what you still owe. Guaranteed Asset Protection insurance covers the difference between the insurance payout and the remaining loan balance.3Consumer Financial Protection Bureau. What Is Guaranteed Asset Protection (GAP) Insurance?
GAP is worth considering if you put less than 20% down, if your loan term is five years or longer, or if you’re financing a car that depreciates quickly. For co-borrowers, being stuck splitting a loan balance on a car that no longer exists is a particularly bad scenario, and GAP coverage eliminates that risk for a small premium.
Gift Tax When One of You Pays More
Spouses can transfer unlimited assets between each other tax-free. Unmarried partners cannot. If one partner contributes significantly more toward the purchase price than their ownership share reflects, the IRS can treat the excess as a taxable gift.
The math: say one partner pays $35,000 for a car titled equally in both names. That partner has effectively given the other $17,500 of vehicle ownership. For 2026, the annual gift tax exclusion is $19,000 per recipient.4Internal Revenue Service. Frequently Asked Questions on Gift Taxes $17,500 is under that, so no gift tax return is required. But if the car cost $50,000 and one partner paid for all of it, the implied $25,000 gift exceeds the exclusion, and the partner who paid has to file IRS Form 709.5Internal Revenue Service. Revenue Procedure 2025-32
Filing the form doesn’t necessarily mean owing tax. It counts against the lifetime estate and gift tax exemption, which is over $13 million for 2026. But the filing requirement catches people off guard, and failing to file when required can trigger penalties. If one of you is paying a disproportionate share, either match the ownership percentages on the title to the actual contributions, or keep the implied gift below the annual exclusion.
If One of You Files Bankruptcy
When one co-owner files Chapter 7, the jointly owned car can be pulled into the bankruptcy estate. The trustee looks at the filing partner’s ownership interest and decides whether selling the car would generate money for creditors. The non-filing partner’s share is protected and returned after any sale, but the practical result can still hurt.
If, for example, you both equally own an unfinanced car worth $30,000 and one of you files, the trustee can sell the car, return $15,000 to the non-filing partner, apply the filing partner’s available vehicle exemption, and distribute what remains to creditors. The non-filing partner gets cash but loses the car.
An outstanding loan complicates things further. The lender’s lien has priority over the trustee’s interest, so the loan has to be addressed before any equity gets distributed. If the car is worth less than the balance, there’s no equity for the trustee to pursue. If you’re co-borrowing with a partner who carries significant other debts, understand that your shared vehicle can become collateral damage in a bankruptcy you had nothing to do with.
Steps to Take Before You Buy
Sort this out before anyone signs a purchase agreement. Once the title is issued and the loan is funded, changing the structure gets expensive.
- Pull both credit reports first. Get free reports from all three bureaus so there are no surprises on the loan application. A co-borrower with hidden delinquencies can tank the rate for both of you.
- Decide on title structure at the DMV. Call your state’s DMV and ask exactly how to title the car in both names and which forms of co-ownership are available. States handle this differently, and fixing a title mistake later costs money.
- Get the co-ownership agreement in writing before the purchase. Financial terms are easier to negotiate when you’re both excited about a new car than when you’re angry about a breakup.
- Budget for both names on insurance. Get quotes for a shared policy before you commit. If your insurer won’t write one for unmarried partners, factor the cost of two policies into the decision.
- Talk about the exit plan honestly. Nobody wants to discuss breaking up while buying a car, but that conversation is what prevents the worst outcomes. Decide now what happens if one of you wants out in two years.