There’s more than one path to rebuilding trust after a spouse’s betrayal. One is to create a postnuptial agreement, colloquially known as a postnup. A postnuptial agreement, which a couple enters into after marriage, can offer similar reassurances to a prenuptial agreement (prenup), which a couple enters into before marriage.

The main difference is timing and the scrutiny a postnup might face based on the laws of the presiding jurisdiction, should there be a challenge. Given the increased potential for power imbalances between spouses once they’re married and the duress one spouse could face from the other, a postnuptial agreement can be effective in helping couples rebuild after betrayal when used with good intentions by both spouses.

It’s worth noting that a betrayal, such as an affair or an undisclosed addiction, isn't necessarily rooted in finances. However, betrayal of any kind could impact a couple’s financial situation, which a postnup can help ward against. This includes but is not limited to lying about spending or debts, reneging on career or relocation plans, and sharing personal information without their spouse’s consent. Here’s what a postnup can do to........

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