13 million Americans have hidden this from their spouse

Bank of America Corp. ATMs outside of the Bank of America Plaza tower in Los Angeles, California.
Patrick T. Fallon | Bloomberg | Getty Images

Are you keeping a financial secret from your significant other? Well, you're not alone.

More than 13 million Americans have a bank or credit card account that their spouse or partner doesn't know about, according to a new CreditCards.com report.

Princeton Survey Research Associates International surveyed 1,003 adults in January for the study.

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Some 41 percent of respondents admitted to spending more than $100 without their spouse or partner's knowledge, while 19 percent say they've spent $500.

However, nearly a quarter of participants — 24 percent — stated that their significant other should have free reign to spend more than $500 without telling them about the purchase. On the other hand, 47 percent said that they would be okay if their partner spent more than $100 without their knowledge.

The report also determined that men are twice as likely as women to spend $500 without the knowledge of their spouse or partner.

Millennials and seniors are the most conscious of their partner's financial awareness, according to the report. The two generations are less likely to spend more than $25 without their significant other's knowledge, as compared to Americans aged 30 to 64.

"Avoiding secrets is key to a successful relationship," Matt Schulz, CreditCards.com's senior industry analyst, said in a statement. "It's important to be honest with your significant other about spending and finances. In the end, secret spending can lead to spiraling debt as well as a messy break up."