However, there's a common mistake he sees couples make when it comes to managing their money. "Often one partner has taken on the role of the 'money person,'" he tells CNBC Make It. What to do if you're the 'money person' in your relationshipIf you're the "money person" in your relationship, you might want to make a change, Sethi says. "The person who's the 'money person' has to take on the responsibility of gently recalibrating the relationship." Additionally, if you're the "money person," don't overuse financial terms like "compound interest" or "tax-advantaged accounts" that your partner may not understand.

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Persons: combatting overspending, Ramit Sethi, Rich, Sethi, It's, doesn't, You've Organizations: CNBC, Fidelity Investments