A new study released Friday says this is something 1 in 5 Minnesotans DON'T tell their significant others. Know what it is?

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If you keep this a secret from your spouse or partner, you're not alone. It's something that nearly 29 million Americans also keep from their partners. And, according to this new CreditCards.com survey it can lead to trouble in your relationship.

No, it's not THAT. It's actually having a secret credit card, checking or savings account that you haven't told your partner about. The report calls it 'financial infidelity,' and says it affects roughly 20-percent of Minnesotans.

The report says that secret accounts are most common among Millennials, where 28 percent of respondents said they're currently hiding bank or credit cards from their live-in partners.

And that can be a problem! More than half of the people surveyed said keeping financial secrets was almost as bad as physical infidelity, and said it was at least equal to physically cheating or having an affair.

Ted Rossman is a CreditCards.com financial analyst, and he said keeping a financial secret from your partner IS bad news. “You can still maintain some privacy over your finances, and even keep separate accounts if you and your spouse agree, but you need to get on the same page regarding your general direction, otherwise your financial union is doomed to fail," he said in the report.

Do you have a financial account you keep secret from YOUR partner?

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