Yes, you can sue an ex who stops paying the mortgage on a home you both signed for. The strongest legal path depends on what connects you: a divorce decree that assigned the loan to your ex, a separate written agreement about splitting payments, or just the joint loan itself. One reality shapes every option below. Your lender treats both borrowers as fully responsible for the entire debt no matter what a court or a private agreement says between you, so while you build your case you will likely need to keep paying to protect the house and your credit. The money you spend covering your ex’s share becomes the basis of what you can recover.
Why You’re Still on the Hook to the Lender
When two people sign a mortgage, they typically sign a promissory note that makes each borrower individually responsible for the full balance. This is joint and several liability, and it means the lender can demand the entire payment from either borrower.1SEC.gov. Mortgage and Security Agreement If your ex walks away from a $2,000 payment, the lender does not care that your share was $1,000. You owe $2,000.
A divorce decree or separation agreement can divide mortgage responsibility between the two of you, but that only binds the two of you. It does not change your contract with the lender. Even if a judge orders your ex to make every payment, the lender can still report missed payments on your credit, charge you late fees, and ultimately foreclose. That gap between what a court orders and what a lender enforces is where the money you’re trying to recover comes from.
One warning worth stating plainly, because it trips people up: signing a quitclaim deed does not end your mortgage obligation. A quitclaim transfers your ownership interest in the property, but the note is a separate contract. You can lose all rights to the home while remaining fully liable for the loan. The only ways off the note are a refinance into your ex’s name alone, a formal loan assumption approved by the lender, or the property being sold and the loan paid off.
If a Divorce Decree Assigned the Mortgage to Your Ex
This is the most direct route. A divorce decree is a court order, and violating one carries consequences beyond an ordinary contract dispute. You generally have two tools, and many people use both.
File a Contempt Motion
You can go back to the family court that issued the decree and file a motion for contempt, telling the judge your ex is willfully ignoring the order. A judge who finds your ex in contempt can impose fines, order immediate compliance, require your ex to reimburse your legal fees, and in extreme cases order jail time. Contempt is often faster and cheaper than a separate civil lawsuit because you’re returning to a court that already knows your case and already made the ruling being violated.
Sue for Damages
You can also file a civil suit for the financial harm caused by the missed payments. This is especially useful when your divorce decree contains a hold harmless or indemnification clause, which requires the spouse assigned a debt to cover any costs the other spouse incurs if creditors come after them. That clause gives you a clean basis to recover late fees, credit-related costs, and every payment you made to keep the loan current. A judgment can be enforced through wage garnishment or asset seizure.
If There’s No Decree, or the Decree Didn’t Address the Mortgage
Unmarried co-owners, and divorced people whose decrees are silent on the loan, generally sue for breach of contract. To win, you typically need to show four things: a valid agreement existed, it included clear payment obligations, your ex failed to perform, and you suffered financial harm.
The mortgage note itself binds both of you to the lender rather than to each other, so what strengthens your case is any written agreement between you and your ex about splitting payments. A cohabitation agreement, a text thread confirming the arrangement, or even a documented pattern of alternating payments through bank records can establish the obligation. Courts look at the relationship between the parties to determine whether a direct contractual obligation existed.2Legal Information Institute. Privity
Even without a written agreement, joint and several liability gives you a right of contribution. When you pay more than your share of a joint obligation, the law generally lets you recover the excess from the person who should have been paying. Six months of covering the full mortgage produces a quantifiable claim for every dollar above your own share.
Proving damages is straightforward when you’ve been covering the payments. Gather bank statements showing what you paid, late fee notices, correspondence with the lender about delinquency, and records of any added interest charges. Courts also expect you to take reasonable steps to limit your losses, so keep documentation of your efforts to resolve the situation.
When You Need to Force a Sale
If you co-own the property and your ex refuses to refinance, sell, or pay, any co-owner can file a partition action asking a court to sell the property and split the proceeds. This is the last-resort option, but sometimes it’s the only way to sever a financial tie your ex will not resolve voluntarily.
Courts typically order a sale rather than a physical division. During partition the court conducts an accounting, examining who paid what toward the mortgage, taxes, insurance, and upkeep. If you’ve been carrying the bulk of the mortgage, the court can adjust the split of the sale proceeds to reflect those contributions.
Partition cases typically take six to twelve months. Attorney fees for a straightforward partition often exceed $5,000, and contested cases can run $15,000 to $20,000 or more. Weigh that against the amount at stake. For some people, refinancing into their own name is cheaper than litigating, if they can qualify alone.
What a Court Can Actually Order
The most common outcome of a successful case is a money judgment covering the payments you made on your ex’s behalf, plus late fees and any added interest charges caused by the delinquency. Post-judgment interest accrues on the amount owed and varies by state, typically ranging from a few percent to twelve percent annually.
Courts can also order equitable remedies. Specific performance forces your ex to actually make the mortgage payments going forward rather than just reimbursing you after the fact. A declaratory judgment clarifies each party’s rights and obligations, useful when there’s genuine confusion about who owes what.
If the amount you’re owed is relatively small, small claims court is worth considering. Jurisdictional limits vary widely, from $2,500 in some states to $25,000 in others. Small claims courts can only award money, not order future payments, but they’re faster and cheaper than a full civil suit. For a few months of missed mortgage payments, that trade-off often makes sense.
Don’t Wait Too Long to File
Every state sets a deadline for filing a breach of contract lawsuit. For written contracts like a mortgage note or divorce decree, these deadlines range from three years in some states to ten in others. Miss the window and your claim is gone, no matter how strong it was.
The clock typically starts when each missed payment occurs rather than when the mortgage was originally signed. A claim based on last month’s missed payment may be viable even if your ex stopped paying years ago, as long as the most recent misses fall within the limitations period. Some states also set separate limitation periods for mortgage-related claims that differ from the general contract deadline, so check your state’s rules before assuming you have time.
Keep Paying and Talk to the Servicer
Litigation takes time, and your lender will not pause foreclosure while you fight in court. Contact your servicer early. Federal law gives you certain protections: if you send your servicer a written dispute, they must acknowledge it within five business days and investigate within roughly 30 business days.3Federal Trade Commission. Your Rights When Paying Your Mortgage
Some servicers offer temporary forbearance, which lets you reduce or pause payments for a limited period. Others may agree to a loan modification. Both usually require cooperation from all borrowers on the note, though servicers have become more willing to work with one borrower alone when the other is absent because of divorce or separation. Getting there usually takes persistence and escalation within the servicer’s hierarchy.
The cleanest fix is getting the loan into one name. If your ex was supposed to keep the house and the mortgage, push for a refinance or a formal loan assumption. In an assumption, the lender evaluates whether your ex qualifies to carry the loan alone, and if approved, you’re released from liability entirely. If your ex cannot qualify, that fact itself strengthens your argument that the property needs to be sold.