Cheating Is Almost Always Framed as a Physical or Emotional Betrayal Between Two Partners, but Alarming New Survey Data Shows Money Secrets Can Be Just as Devastating to a Couple

You’ve probably pictured cheating as something that happens in a hotel room or over late-night texts. But according to Bankrate’s newest survey, the more common betrayal might be sitting in your joint checking account. Forty-three percent of U.S. adults now say a partner’s financial secrets are at least as damaging as a physical affair, and 45 percent of people in relationships admit they don’t have the complete financial picture on their significant other. Money, it turns out, keeps almost as many secrets as people do.

What Counts as Financial Infidelity, Exactly

Financial infidelity rarely looks like a dramatic secret bank account in a soap opera. It’s smaller and, in a way, sneakier than that. Bankrate’s December 2025 survey of 2,564 U.S. adults, fielded through YouGov, found that a quarter of people hide minor debt, spending, or income from a partner, while 11 percent stay quiet about their credit score or investment details. Nine percent are concealing something bigger: a major debt or a significant chunk of income their partner doesn’t know exists. It adds up to a pattern where 45 percent of couples say they don’t fully know each other’s financial situation, even as 55 percent believe they know everything.

Younger Couples Are Judging Money Secrets More Harshly

Here’s where the generational split gets interesting. In Bankrate’s 2026 data, millennials are the generation most likely to say financial secrets are as bad as or worse than cheating, at 47 percent, followed by Gen X at 44 percent and Gen Z at 42 percent. Baby boomers are the outliers at the other end, with only 39 percent putting money secrets on par with physical infidelity. So if you’re under 45, the data suggests you and your generation are measurably less forgiving of a hidden credit card than your parents were.

That gap runs in both directions, too. Boomers report the most transparency with a partner, with 64 percent saying they know everything about their partner’s finances, compared to 53 percent of millennials, 51 percent of Gen X, and just 44 percent of Gen Z. In other words, younger generations are simultaneously the most judgmental about financial secrecy and, by their own admission, the least likely to have full visibility into their partner’s money. “Money can be a major source of conflict in relationships,” Bankrate senior industry analyst Ted Rossman said in the release. “It hurts when someone breaks your trust, and it’s hard to get it back.”

A Second, Independent Survey Tells the Same Story

If Bankrate’s numbers stood alone, you might chalk them up to one company’s framing of a hot-button topic. They don’t stand alone. Fidelity Investments’ 2026 Couples and Money Study, a separate survey of 3,193 married or partnered U.S. adults fielded between October 14 and November 2, 2025, found that 24 percent of long-term couples admit to hiding a money secret from their partner, and 7 percent are carrying credit card debt their spouse doesn’t know about.

Fidelity’s study also found that nearly half of couples, 49 percent, actively avoid money conversations to prevent arguments, with 44 percent citing fear of a fight as the specific reason. That avoidance shows up as a real communication gap: while 91 percent of couples believe they talk openly about money, only 29 percent say they actually discuss day-to-day finances on a regular basis, and half wish they talked about it more. More than half, 56 percent, admit to monitoring their partner’s spending, and nearly a third say they keep score on it.

Why the Secret Feels Easier Than the Conversation

So why keep the secret, when you presumably know it could cost you your partner’s trust? Bankrate’s respondents were fairly candid about their reasoning: 28 percent said they simply feel entitled to some financial privacy inside a committed relationship, 15 percent said they specifically didn’t want their partner to know, and 14 percent pointed to plain embarrassment. None of those reasons are exotic. They’re the same instincts that make you avoid mentioning a bad grade to a parent, just applied to a joint bank account.

That’s arguably the most useful thing both surveys reveal: financial infidelity usually isn’t a scheme. It’s an avoidance habit that snowballs. A small, unmentioned purchase becomes a pattern of minor debt, which becomes something you’re actively managing to keep hidden, which eventually feels too big to bring up without a real conversation about trust.

What This Means for Your Relationship

Between Bankrate’s survey and Fidelity’s, the picture is consistent even though the two organizations asked different questions in different ways: somewhere between roughly a quarter and nearly half of couples, depending on how the question is framed, are keeping some kind of money secret right now, and a growing share of you, especially if you’re a millennial or Gen X, consider that just as serious a breach as an affair. The fix isn’t complicated, even if it isn’t easy. It’s the 29 percent solution: couples who talk about day-to-day money regularly, not just during a crisis or tax season, are the ones least likely to be nursing a secret in the first place. If you’ve been putting off that conversation, the numbers suggest you’re far from alone, but also that it’s worth having sooner rather than later.