Prenuptial Agreements: What They Cover and How They Work

The Document 40% of Americans Want But Only 15% Create

A 2023 Harris Poll found that 40% of engaged or recently married Americans believe a prenuptial agreement would be a good idea for their relationship. Yet only about 15% actually sign one. The gap reflects persistent misconceptions — that prenups are only for the wealthy, that proposing one signals mistrust, or that they're unromantic by definition. In reality, a thoughtfully negotiated prenuptial agreement is a financial planning tool, not a prediction of failure.

What a Prenuptial Agreement Is

A prenuptial agreement (also called a premarital agreement or antenuptial agreement) is a legally binding contract signed by two people before marriage. It establishes property rights and financial obligations that will govern the relationship if the marriage ends by divorce, death, or legal separation.

Every US state recognizes prenuptial agreements, though enforceability requirements vary. Most states have adopted the Uniform Premarital Agreement Act (UPAA) or a similar statute, providing a consistent framework for validity.

What Prenups Can Cover

• Separate property protection: Defining assets owned before marriage (real estate, investments, business interests) as separate property that won't be divided in divorce
• Inheritance protection: Ensuring that assets intended for children from a prior relationship remain with those beneficiaries
• Business protection: Shielding business ownership from marital property claims, particularly for entrepreneurs and business owners
• Debt allocation: Specifying who is responsible for pre-existing student loans, credit card debt, or business liabilities
• Property rights during marriage: How income is treated, whose name is on what accounts, how savings are handled
• Spousal support provisions: Either waiving alimony or establishing a formula for calculating it if divorce occurs

What Prenups Cannot Cover

Requirements for Enforceability

Courts have struck down prenuptial agreements for procedural or substantive defects. To be enforceable, a prenup typically must:

• Be in writing and signed by both parties — oral prenuptial agreements are not enforceable
• Be signed voluntarily — signed under duress, pressure, or extreme time constraint may render it unenforceable. Presenting the agreement the night before the wedding is a significant red flag.
• Include full financial disclosure — both parties must fully and honestly disclose their assets, income, and liabilities. Hidden assets can void the agreement.
• Be independent legal counsel advised — while not universally required, each party having their own attorney dramatically strengthens enforceability
• Not be unconscionable — agreements so one-sided that they shock the conscience may be invalidated by courts

When a Prenup Makes Clear Sense

Specific circumstances make prenuptial agreements particularly valuable:

• Significant wealth disparity between partners
• Prior marriages with children from those relationships
• Business ownership — protecting a company from forced sale in divorce
• Family inheritances or trusts intended for future generations
• Anticipated inheritance from parents with specific conditions
• One spouse supporting the other through professional training or education

Postnuptial Agreements: The Married Alternative

A postnuptial agreement serves the same purpose as a prenup but is signed after marriage. States apply the same general enforceability requirements — voluntariness, disclosure, and consideration (the exchange of value that makes a contract binding). The consideration issue is more complex with postnups because parties are already married, but courts generally accept continued commitment to the marriage as valid consideration.

Common triggers for postnuptial agreements include significant business growth after marriage, inheritance of a family property, one spouse resuming work after years as a caregiver, or addressing issues that arose during the marriage that both parties want to formally resolve.

Typical Costs and Timeline

Disclaimer: Prenuptial agreement law varies significantly by state. Enforceability depends on specific facts and circumstances. This article is for educational purposes only. Consult a licensed family law attorney in your jurisdiction before creating or signing any premarital agreement.