You can sue someone for taking money from a joint bank account, but the lawsuit has to go after the person who took the money, not the bank that let them do it. Every co-owner on a joint account has the legal right to withdraw the full balance at any time, so the withdrawal itself is not automatically wrongful. Winning the case comes down to proving the funds actually belonged to you and the other person had no right to keep them.
Why the Bank Isn’t Your Target
Joint accounts carry a presumption of equal ownership. When two names sit on an account, the bank treats each holder as a full owner of the entire balance, no matter who deposited what. The default structure in most cases is joint tenancy with right of survivorship: either owner can access everything while both are alive, and the survivor inherits the balance automatically.
Under that structure the bank is in the clear when it hands the money over. The Consumer Financial Protection Bureau confirms that in most circumstances either person on a joint checking account can withdraw the money and even close the account without the other’s agreement.1Consumer Financial Protection Bureau. Joint Account Owner Took Money and Closed Account Filing a complaint with the bank almost never produces a recovery. The bank followed the account agreement, and from its side the transaction was legitimate.
Your dispute is with the other account holder. That is the first thing to accept before you spend any energy on a claim.
When a Withdrawal Becomes Legally Wrongful
Having authority to make a transaction is not the same as having the right to the money. To win, you need to defeat the presumption that both owners shared the funds equally.
Tracing the Source of the Funds
The strongest position is showing the money came from you alone. If your paycheck was the only income going in, or the balance came from your inheritance or a personal injury settlement, you can argue the other person was never meant to own those funds. Courts recognize what is called a resulting trust in these situations. When one person contributes all the money to a joint account, the law can presume the contributor intended to keep the beneficial interest rather than make a gift to the co-owner. The burden then shifts to the person who took the money to prove a gift was actually intended.
The classic version involves an elderly parent who adds an adult child to the account so the child can help pay bills. The parent never meant to give the child half the balance. If the child drains it, a court can find that a resulting trust existed and the child was holding the funds on the parent’s behalf.
Proving an Agreement About How the Money Would Be Used
Even when both people contributed, you can have a claim if there was a mutual understanding about the money’s purpose. A couple saving for a home purchase, one person cleaning out the account for personal spending: that withdrawal breaks the agreement. The understanding does not have to be in writing, but written evidence makes the case much easier. Oral agreements are enforceable, though you will need corroborating evidence like text messages, emails, or a witness who heard the conversation.
The Legal Claims You Can Bring
When you sue, you need to frame the wrongdoing under a recognized legal theory. Attorneys usually plead more than one in the same complaint.
Conversion
Conversion is the civil version of theft. You are alleging the other person took control of money that belonged to you and deprived you of its use. Two elements matter: you had a right to the funds, and the other person exercised control over them in a way that interfered with that right. When conversion involves money instead of physical property, courts add a further requirement. The funds have to be specifically identifiable and traceable, not just a vague claim to some of the money in the account. Detailed bank records showing where each deposit came from are what carry this claim.
Unjust Enrichment
This one does not require proving theft or a broken agreement. It argues that the other person received a benefit at your expense and that basic fairness demands they give it back. You need three things: the other person received something of value, you suffered a corresponding loss, and no legitimate reason exists for them to keep it. Unjust enrichment is useful when there was no formal deal about the money but the circumstances make it obvious the withdrawal was wrong.
Breach of Fiduciary Duty
This claim applies when the relationship between the account holders involved a special level of trust. Not every joint account creates a fiduciary relationship, but some do. The common example is an adult child who has been added to a parent’s account to manage the parent’s finances. That child has an obligation to act in the parent’s interest, and draining the account for personal use violates that duty. Courts look at whether one person had discretion over the funds and the other was vulnerable or reliant on them.
Evidence That Actually Wins
The presumption of equal ownership is working against you from the start. Overcoming it takes documentation, not your word.
- Complete bank statements showing every deposit and withdrawal, so a pattern of who put money in and who took it out is on the record.
- Deposit source records: pay stubs, direct deposit confirmations, inheritance checks, settlement paperwork, or anything else that proves the funds originated from your income or assets alone.
- Communications: emails, texts, voicemails, or letters where you and the other person discussed the money’s purpose or any restrictions on withdrawals. A single text saying “don’t touch the savings, that’s for the house” can carry serious weight.
- Account opening documents. The original signature cards or account agreement may contain details about the intended structure or purpose.
- Witness testimony from anyone who heard conversations about the money or who saw how the other person spent it afterward.
For conversion specifically, the traceability rule means connecting specific deposits to specific sources. “I earned most of the money” is weaker than showing every direct deposit came from your employer while the other person contributed nothing.
What to Do Right Now
If you have just discovered the withdrawal, move fast. Waiting shrinks both the recovery and the strength of your legal position.
Freeze or Restructure the Account
Call the bank and ask to freeze the account or convert it to one that requires both signatures for any transaction. The bank probably will not reverse the withdrawal, but it can stop further losses. If the bank will not freeze it, consider pulling out your fair share and moving it to an individual account. Leaving money in a compromised joint account is a risk you do not need to take while the dispute plays out.
Send a Demand Letter
A written demand does two things: it creates a record that you tried to resolve the dispute without litigation, and it puts the other person on notice that you intend to sue. State the amount withdrawn, the date, why the funds belong to you, and a deadline for repayment. Fourteen to twenty-one days is standard. Keep the tone factual. The letter can become an exhibit later, and judges notice when a plaintiff tried to settle first.
Preserve Everything
Screenshot text messages, print emails, and download bank statements before anything can be deleted or before access is cut off. If you share a home or computer with the other person, copy whatever financial records you can reach. Once things escalate, cooperation disappears.
Where to File and How Long You Have
Where you file depends on the amount at stake. Small claims court handles disputes up to a cap that varies by state, generally from a few thousand dollars up to $25,000. The process is faster, cheaper, and built so you can represent yourself. Above your state’s small claims limit, you file in civil court, where the process is more formal and legal representation becomes much more practical.
Every state sets a statute of limitations for these claims. For conversion and breach of oral agreement, the window is generally two to six years depending on the state and the specific theory. The clock usually starts on the date of the withdrawal or the date you discovered it. Missing the deadline ends the case regardless of how strong the evidence is. If the withdrawal happened more than a year ago, check your state’s specific deadline with an attorney before doing anything else.
If You Are Married and Divorcing
A drained joint account inside a divorce is handled differently. Once divorce papers are filed, the money dispute folds into the division of marital assets, and family court handles it instead of a separate civil suit. Many states impose automatic restraining orders the moment the case is filed, prohibiting large withdrawals, transfers, or liquidations outside normal household expenses. Violating one of those orders can bring contempt findings and an unfavorable property division. If your spouse emptied the account before filing, tell your attorney right away; the court can account for the dissipated funds when dividing what is left.
If the Account Holder Is an Elderly Relative
When a family member, caregiver, or anyone in a position of trust drains a senior’s account, the conduct can cross from a civil dispute into criminal financial exploitation. Every state has statutes specifically targeting financial exploitation of older adults, and the Department of Justice maintains a compilation of them through its Elder Justice Initiative.2United States Department of Justice. Elder Abuse and Elder Financial Exploitation Statutes Criminal prosecution runs separately from a civil lawsuit and can happen at the same time. Report suspected exploitation to your local Adult Protective Services agency alongside any civil claim. Some states also allow enhanced damages and recovery of attorney fees in elder financial abuse cases that would not be available in a standard conversion claim.