Financial infidelity is when one spouse hides money, debt, or spending from the other in a way that goes beyond an ordinary disagreement about budgeting. Hiding money from a spouse can take many forms, including secret accounts, undisclosed debt, hidden purchases, or lying about income, and according to Investopedia, that combination is what defines financial deception in a marriage rather than a normal money disagreement.

It's not the same as simply disagreeing about money. The line is deception, not disagreement. A couple who argues about whether to buy a new car isn't dealing with financial infidelity. A spouse who opens a credit card in secret and hides the statements is.

A recent Bankrate survey of more than 2,000 U.S. adults found that 40% of people in committed relationships have kept a financial secret from their partner: most commonly overspending (33%), followed by secret debt (23%) and hidden bank or credit card accounts. Nearly half said they consider financial secrets at least as damaging as physical infidelity.

Not every secret is a red flag. Plenty of couples keep some money separate on purpose, using individual "spending money" accounts both partners know about and can see. The problem isn't separate accounts. It's accounts, debts, or spending your spouse doesn't know exist at all.

One or two of these on their own don't prove anything. Plenty of people forget to mention a small purchase or let a bill slide. A pattern of them, especially combined with evasiveness when you ask direct questions, is what typically points to financial infidelity rather than a one-off mistake.

If you're seeing several of these signs at once, it's worth pulling your own credit report before you say anything. A credit report will show accounts and inquiries your spouse can't talk their way around, which gives you something concrete to work from instead of a conversation that turns into "you're overreacting."

Financial infidelity by itself is not usually a crime. Hiding a credit card or a savings account from your spouse isn't a criminal offense in most states, even though it can badly damage the marriage.

It can, however, matter a great deal in a divorce. Courts often call concealing or wasting marital funds "dissipation" — spending, hiding, or transferring assets in a way that reduces what's available to divide. As Cornell Law School's Legal Information Institute explains, marital fault like adultery is generally irrelevant to how property gets split, but economic misconduct, including dissipation of assets, is something courts typically do consider.

That distinction matters. Financial infidelity isn't automatically "grounds" for divorce the way adultery or abandonment can be in some states, but a judge can weigh it heavily when dividing property or debt. If your spouse drained a joint account to fund a secret habit, that isn't necessarily a separate legal claim, but it can shift how the rest of your assets get divided.

Some cases cross into fraud, such as forging a signature on a loan or hiding assets from the court during discovery. That's a different and more serious problem, and it's one a family law attorney should look at directly.

Most states, including all of Marble's active states, offer "no-fault" divorce, meaning you don't have to prove your spouse did anything wrong to get divorced. You can simply state the marriage is no longer workable. That means you generally don't need financial infidelity to qualify as a legal "ground" in order to file. Where it matters most is later in the case, when the court divides property and debt.

Generally, no. In most states, financial infidelity gets addressed inside the divorce case itself, not through a separate civil suit against your spouse.

What actually happens is that your attorney raises the hidden assets or debt as part of the property division process. The court can then adjust the split to account for what was concealed or wasted, rather than simply dividing what's left 50/50 (or "fairly," depending on your state).

There are exceptions. If your spouse forged your signature, misused a power of attorney, or otherwise committed a form of fraud that caused you direct financial harm, a separate legal claim may be possible. Those situations are less common and depend heavily on your state's law, so they're worth raising with an attorney rather than assuming either way.

This is also where the term "dissipation" tends to do the real work. Instead of suing your spouse directly over the secret spending, your attorney documents it as part of the divorce case and asks the court to account for it when dividing what's left, effectively treating the wasted money as if it were still there to divide.

Once a divorce is filed, your attorney can use "discovery," the formal legal process for requesting information, to fill in the gaps. Both spouses are generally required to exchange financial disclosures early in the case, according to the California Courts Self-Help Guide.

If one side won't cooperate, the other can compel it through interrogatories, document requests, or depositions. Rules and deadlines vary by state, but the tools are similar nationwide. Discovery itself is common: requests for records, subpoenas, and formal responses are among the most frequently used services in Marble's divorce cases.

In cases involving significant hidden assets, such as a business, multiple accounts, or larger sums of money, attorneys sometimes bring in a forensic accountant to trace transfers and reconstruct a full financial picture.

Forensic accounting isn't something Marble sells or tracks as its own service line. It's brought in case-by-case through the attorney rather than billed as a fixed-price service.

Consider an illustrative composite scenario based on situations attorneys commonly see:

After 12 years of marriage, a wife notices a credit card statement arriving at her husband's office instead of their home. It shows a $22,000 balance she never knew about.

Once the divorce is filed, her attorney requests the full account history through discovery. The balance turns out to have funded a trading account her husband opened alone.

Because she never knew about or benefited from that debt, her attorney argues it should count as his separate dissipation, not shared marital debt. The court agrees, allocating the balance to him and increasing her share of what's left.

The goal before you file isn't to build a criminal case — it's to make sure nothing disappears once your spouse knows a divorce is coming. If you have access to joint statements now, save or print copies. Accounts can be closed, statements can stop arriving, and online access can be revoked the moment your spouse suspects you're preparing to file.

Community property states (Arizona, California, Texas): Marital assets are generally split 50/50. If a judge finds that one spouse dissipated funds, courts typically add the dissipated amount back into the total before dividing it, so the other spouse isn't left absorbing the loss alone.

Equitable distribution states (Colorado, Florida, Georgia, Illinois, Maryland, Michigan, New York): Judges divide property based on what's fair, not necessarily equal. Dissipation is typically one of several factors a court weighs, which can shift a larger share of the remaining assets to the other spouse.

Definitions of dissipation and how far back courts will look vary by state. A local family law attorney can tell you how it's likely to play out where you live.

They can also tell you how your state treats dissipation, whether what you're dealing with has crossed into fraud, and when it's worth requesting a court order to freeze accounts before more money moves.

Financial infidelity in a marriage rarely shows up as a single dramatic discovery. It's usually a pattern you piece together from missing statements and unexplained numbers. It isn't automatically a crime, and it isn't automatically grounds for divorce. But when a marriage does end, courts can and often do account for hidden or wasted assets when dividing what's left. If you're heading toward a divorce and financial infidelity is part of the picture, the documentation you gather now is what your attorney will use to protect your share later.

Disclaimer: This article is for general informational purposes only and is not legal advice. Laws vary by state and change over time, and your situation may differ from the examples described here. For advice about your specific circumstances, consult a licensed attorney in your state.