Studies show that most marriages dissolve over money.

According to a 2015 study from SunTrust Bank, 35% of survey respondents say money was the biggest "stress" issue in a relationship. (At 25%, "annoying habits" was the second biggest relationship-killer, SunTrust reports.)

To bolster any marriage, and any romantic relationship, the key is to make smart household money moves, and avoid any mistakes that would otherwise threaten marital bliss.

Which money mistakes are the biggest marriage-wreckers? Try these on for size:

Poor money communicating - The biggest financial mistake made in a marriage is a lack of communication, says Deborah Sweeney, CEO of MyCorporation.com, in Los Angeles. "Before you get married, sit down with your partner and have an open discussion about your finances," Sweeney advises. "That discussion should include all of the details of what your current financial situation looks like, including whether you're using your own personal bank account or if you would like to merge joint assets." Sweeney also urges couples to own up on any existing, outstanding loans or bills. "By communicating early on, this ensures a lack of surprises later on," she says.

Different money mindsets - Most money mistakes in marriage come down to one main issue: both partners have fundamentally different values about money, notes Jonathan Bennett, a certified counselor in Columbus, Ohio. "Many of these views on money are developed very early and can be hard to change," Bennett says. "For example, one partner might have been raised to believe in paying bills on time and saving. The other partner might have been taught that when you get money, you spend it, even if the bills don't get paid." In that way, it's very difficult for partners who view money, saving, and spending in fundamentally conflicting ways to manage household finances successfully as a team, Bennett says.

"Hiding" money moves - The biggest mistakes that couples make is when the other person doesn't agree with something that they want to do, they do it anyway and hide it, says Debbi King, personal finance expert and motivational speaker, in Quakertown, Pa. "This is called financial infidelity and is rampant in our society," King says. "It's so easy to hide transactions today with many couples having their own credit cards and own bank accounts. But not working together in the area of money can cause a major trust and communication issue in the marriage." King says that couples must be on the same page with money and constantly be communicating their dreams and wants in order to negotiate and do what is best for the marriage. "Hiding anything is never the answer and will only bring problems now and in the future," she says.

A lack of trust - "Marriages don't break up over money - they break up over people feeling unsupported by their partner's choices when it comes to money," says Dr. Elinor Robin, a divorce mediator in Gainesville, Fla. Robin says she has seen people invest in businesses without telling their spouse and borrow money on their houses or retirement accounts. "They rationalize that when success comes the partner will be happy," she notes. "But this is actually a move that proves a lack of trust. The spender doesn't trust the other will be supportive, but as a paradox, the spender proves him or herself untrustworthy."

Bad timing - Many "couples drop money bombs" during inopportune times, says Marc Zola, founder of Eugene Therapy & Oregon Counseling, in Corvallis, Ore. "That's a timing issue," he says. "Discussions about money should be limited to scheduled and boundaried times," he advises. "This serves two purposes, it ensures that the discussion happens and that it is time-limited. Scheduling time-limited discussions honors both partner's need for emotional comfort and safety."

If any of these marital money mistakes look familiar to you, nip them in the bud before they can ruin your romantic relationship.

Because if you don't, your marriage could be in trouble over toxic money issues.

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