Lying about job loss often occurs because spouses are either ashamed of their failure or are convinced they'll be able to nab a new gig before their partner notices.
"We don't see it very often, but you hear about people that are shocked to hear that their spouse has been covering up a job loss," Mindel says. "They leave early to go to work but don't have a job to go to."
Mindel says any vice that sucks up disposable income -- like frequent casino trips or betting at the race track -- is a danger to marriage.
"We've had women [clients] who've been addicted to male strippers and spent all their money on clubs," he says.
"They end up putting financial pressure on their families because of their addiction."
Partners often hide credit card statements or past debt from their spouse, telling themselves that they'll be able to pay off their debt before it balloons.
"I find that most people have no idea how much their partners have in student loan debt, so that can be iffy when the payments need to come out of your joint income," Deniger says.
Before you tie the knot, sit down and exchange a credit history with your partner, Mindel recommends. That way, you're both on equal footing.
If you're uncomfortable coming clean about your debt, you're probably better off putting off marriage altogether.
Couples should treat marriage like a business merger, Mindel says, especially if you're planning on drawing up a prenuptial agreement.
"You've got to know the value of both companies," he says.
Plus, if you ever get divorced, a court can penalize you for not disclosing your full income and award your ex more spousal support.
Andrew Scharge, founder of Money Crashers, says this is an especially easy lie for a stay-at-home spouse, who can cover up bill collector mail and phone calls.
"The difficult result is the loss of their home, which will come as a shocking surprise to the spouse who was unaware of their financial situation," he says.
"It can be a challenge to deal with a lying spouse, but ultimately, if the couple does not deal head-on with these issues of trust by implementing some money management tips for married couples, the couple will very likely separate or divorce."