Common Prenup Mistakes Couples Should Try to Avoid

A prenuptial agreement can bring real clarity and peace of mind to a marriage. But only if it’s done well. We’ve reviewed plenty of agreements over the years, and the ones that cause trouble usually share a handful of avoidable problems.

Most of these mistakes come from good intentions paired with rushed decisions. Our friends at Felt Family Law and Mediation discuss how a prenup lawyer can help couples create agreements that are fair, clear, and more likely to hold up if they’re ever tested. Below are the missteps we see most often.

Waiting Until the Last Minute

Wedding planning is busy, and the prenup often ends up at the bottom of the list. That’s understandable. The problem is that signing an agreement a few days before the ceremony, with deposits paid and guests already traveling, can look like pressure even when none was intended.

That kind of timing may give a spouse grounds to challenge the agreement later. If possible, start the conversation several months ahead.

Leaving Out Financial Information

A prenup depends on honest disclosure.

Couples sometimes forget about an old account, downplay a debt, or leave out an expected inheritance. Occasionally it’s intentional. Usually it isn’t. Either way, incomplete information can weaken the agreement. At a minimum, each partner should share details about:

• Income
• Bank, investment, and retirement accounts
• Real estate and other significant property
• Business interests
• Debts of any kind

When in doubt, disclose it.

Sharing One Attorney

Using a single lawyer may seem efficient. It feels cheaper and friendlier. But an attorney typically can’t represent both sides of the same agreement, because each partner’s interests are different. When only one person has independent advice, the other may later argue they didn’t fully understand what they signed. Separate counsel protects both of you.

Relying on a Generic Template

Online forms are tempting. They’re quick, and they look official. But a template doesn’t know anything about your family, your business, or your plans for the future. It may also miss formal signing requirements or include terms that a court won’t enforce. A fill-in-the-blank document can create a false sense of security.

Making the Terms Too One-Sided

A prenup that heavily favors one partner might feel like a win on signing day. It rarely ends well. Agreements that are extremely unfair may be challenged, and they can breed resentment long before any divorce is on the table. Fairness here isn’t just polite. It’s practical.

Using Vague Language

“We’ll split things fairly.” It sounds nice and means very little.

Strong agreements clearly define what counts as separate property, how growth in the value of that property will be handled, and what happens to a home purchased during the marriage. Ambiguous wording invites the exact disputes the agreement was supposed to prevent.

Ignoring How Life Might Change

Many prenups are written as though life will stay frozen in place. It won’t. Careers shift, children arrive, and one spouse may step back from work to care for the family. Some couples include provisions that address these possibilities, while others agree to revisit the document after certain milestones. Thinking ahead now can save a great deal of frustration later.

Forgetting About Your Estate Plan

Your prenup and your estate plan should work together. If your will or trust says one thing and your prenup says another, your loved ones could be left sorting out the confusion. We generally recommend reviewing both documents side by side, ideally around the same time.

If you’re considering a prenup or would like someone to look over an agreement you’ve already drafted, it may be worth taking the time to connect with an attorney who can answer your questions and offer guidance.