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5 reasons your Missouri prenup may need updating

On Behalf of | Mar 5, 2026 | Prenups & Postnups

Life changes quickly, and your prenup may no longer reflect your current situation. You may have new property, investments or business interests. You may also have a growing family or higher income.

Missouri courts enforce prenups only if they were voluntary and conscionable when signed. Reviewing your agreement ensures it still reflects your situation.

How life changes affect your prenup

Life and finances rarely stay the same, so you may wonder when to update your prenup.

In Missouri, courts enforce prenups only if they were signed voluntarily, with full disclosure and without unconscionable terms at the time of signing. Life changes do not automatically weaken your prenup, but they can create pressure points that make updates worthwhile.

After you marry, you must make any changes in a written amendment or a postnuptial agreement. Ideally, you provide updated disclosures and each spouse works with separate counsel.

The need for periodic review highlights key times to consider making an update.

When to consider updating your agreement

Even a well-drafted prenup can become outdated. Common reasons to update your agreement include:

  • Major career or income changes: Your earnings may increase or you may receive executive bonuses that shift financial balances
  • Significant new assets: Real estate, stock options or business equity can raise questions about classification and valuation
  • Changes in Missouri law or court interpretations: State law updates or case rulings may change how courts enforce agreements
  • Family expansion: Children or stepchildren may prompt you to rethink financial plans or property arrangements
  • Previous clauses no longer reflect your goals: Lifestyle changes, retirement planning or charitable intentions may not match what your prenup says

It is important to remember that Missouri law does not allow a prenup to finally set child support or custody. Courts keep authority and can reject agreements that conflict with a child’s best interests.

Each reason highlights a potential gap. Updating your prenup can help keep your assets secure and intentions clear.

Keeping your plan relevant

Your prenup is a crucial part of your wealth plan. As your career and assets grow, boundaries can blur. Regularly updating your Missouri prenup does two things. First, it keeps your separate, non-marital assets safe. Secondly, it ensures you manage joint property exactly as you both planned.

In financial matters, staying in control is everything. A current prenup reduces uncertainty as life changes.