Prenuptial Agreements: What They Can and Cannot Do

A prenuptial agreement is a contract that two people sign before they marry. It can set out how property, debts, and certain financial matters will be handled if the marriage ends. Many couples use these agreements to protect a business, property owned before the marriage, or family assets. Whether an agreement is enforceable depends on state law and on how it was made. This page explains the general framework, but it cannot tell you whether a specific agreement would hold up in court.

What agreements commonly cover

Prenups often address how property acquired before and during the marriage will be divided, how debts are handled, how a business interest will be treated, and what happens to inheritances or gifts. Some agreements also address spousal support, though state rules limit what a couple can waive in advance. A carefully drafted agreement describes each asset and debt clearly rather than using general language.

What agreements usually cannot do

A prenup generally cannot decide child custody or child support in advance. Courts keep authority over decisions about children, and they will look at the child's interests at the time of the case, not at what the parents agreed before the marriage. An agreement also cannot require someone to commit a crime or override state rules that protect a spouse. These limits vary, so check your state's law.

Formal requirements that matter

Most states require a prenuptial agreement to be in writing and signed by both parties. Many courts look closely at how the agreement was made. Common issues include:

• whether both people signed voluntarily, without pressure;
• whether each person had a fair opportunity to review the agreement before signing;
• whether there was full financial disclosure of each person's assets, debts, and income;
• whether the timing was reasonable, since signing right before a wedding can raise questions;
• whether each person had an independent lawyer, which can strengthen the agreement.

These are general factors, not a checklist that settles whether a court will enforce an agreement. A lawyer can explain how courts in your state have applied them.

Timing deserves special attention. An agreement presented on the eve of a wedding, with little time to review it, can be harder to defend than one signed weeks earlier after a full discussion.

Fairness and enforcement

Some courts review whether an agreement is unconscionable, meaning so one-sided that enforcing it would be unfair. The standard and the way a court applies it differ by state. An agreement that seemed fair when signed may still be challenged later, especially if circumstances changed significantly during the marriage.

Common misconceptions

A prenup does not need to be long to be valid, but it does need to be clear. Vague terms such as "my fair share" can lead to disputes. Another common misunderstanding is that a signed agreement settles every issue. Courts may still look at circumstances at the time of divorce, and some matters, such as children, remain under court control. A document signed in a hurry or without disclosure may also be easier to challenge.

Postnuptial agreements

Some couples sign an agreement after they marry, sometimes called a postnuptial agreement. The rules for these agreements can differ from those for prenups, and some states apply stricter review. Ask a lawyer in your state before relying on one.

Questions to ask a lawyer

• What topics can an agreement cover under my state's law?
• What disclosure should be included, and how detailed should it be?
• Does my state require anything specific for the agreement to be valid?
• Should each person have a separate lawyer?
• How would a court review the agreement if it were challenged?
• Should the agreement be updated later, and how is that done?

Some couples also review their agreement at major life events, such as the birth of a child or the start of a business, so the document still reflects their plans.

Where to get help

Each person can speak with a lawyer before the wedding, and some couples choose to have separate lawyers. The county clerk can explain records and filings, but cannot advise on the agreement's content. The USA.gov courts page explains how state and federal courts are organized.

If cost is a concern, a legal aid program may be able to explain general options. Our family law practice page lists family lawyers by city for those who want private representation.

Frequently asked questions

Is a prenup only for wealthy couples? No. Agreements are used by people with many different financial situations. What matters is how clearly the agreement describes the assets and debts involved.

Does a prenup prevent a divorce? No. It sets out financial terms that may apply if the marriage ends. It does not decide whether a divorce happens.

Can a prenup be changed later? Usually yes, if both people agree and the changes follow the state's formal requirements. Ask a lawyer how to do this correctly.

Do I need a lawyer to sign one? The law does not always require one, but having a lawyer review the document can help you understand what you are signing.

General information, not legal advice. Laws change and every case is different. Talk to a licensed attorney in your state about your situation.