Prenuptial Agreements in the United States

Prenuptial agreement law in the United States is not governed by a single federal statute. Instead, each state establishes its own rules, requirements, and standards for enforceability. While there are common themes across the country, the details vary significantly — a prenup that is ironclad in California might face challenges in New York, and vice versa. Understanding the national framework and your state's specific rules is essential to creating an agreement that holds up in court.

The Legal Framework

The Uniform Premarital Agreement Act (UPAA)

The most significant effort to harmonize prenup law across the United States is the Uniform Premarital Agreement Act (UPAA), adopted in 1983 by the Uniform Law Commission. The UPAA provides a standard framework that addresses:

• What a prenup may cover (property rights, spousal support, choice of law, and other matters not violating public policy or criminal statutes).
• Requirements for execution (written, signed by both parties).
• Standards for enforceability (voluntariness, fairness, disclosure).

As of 2025, approximately 28 states and the District of Columbia have adopted the UPAA or a version closely based on it, including Arizona, California, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Maine, Montana, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, North Dakota, Oregon, Rhode Island, South Dakota, Texas, Utah, and Virginia, among others.

However, many states have modified the UPAA to suit their own policy preferences. California, for instance, added requirements for independent legal counsel and a seven-day waiting period that go beyond the original UPAA text.

The Uniform Premarital and Marital Agreements Act (UPMAA)

In 2012, the Uniform Law Commission adopted an updated version — the Uniform Premarital and Marital Agreements Act (UPMAA) — which covers both prenuptial and postnuptial agreements. The UPMAA introduces several important changes:

• Access to independent legal advice is required for enforcement of a waiver of spousal support.
• Unconscionability is evaluated at the time of enforcement, not just at the time of signing.
• Voluntary consent must be established — a party must have at least 30 days to review the agreement, or must have independent counsel.

Adoption of the UPMAA has been slower. As of 2025, only Colorado, Connecticut, Mississippi, and North Dakota have adopted it in full or substantial part.

States Without Uniform Acts

Several major states — including New York, Florida, and Pennsylvania — have not adopted either uniform act. These states rely on their own statutory frameworks and case law to govern prenuptial agreements. The standards in these states can differ substantially from the UPAA/UPMAA model, particularly regarding disclosure requirements, the role of independent counsel, and the treatment of spousal support waivers.

Community Property vs. Equitable Distribution

One of the most fundamental distinctions in American family law is how states classify and divide marital property. This classification system directly affects what your prenup needs to address.

Community Property States (9 states)

In community property states, virtually all income earned and property acquired during the marriage belongs equally to both spouses, regardless of who earned it or whose name is on the title. Upon divorce, community property is divided 50/50.

The nine community property states are:

1. Arizona
2. California
3. Idaho
4. Louisiana
5. Nevada
6. New Mexico
7. Texas
8. Washington
9. Wisconsin

Alaska allows couples to opt into community property through a written agreement.

In these states, a prenup is particularly valuable because it allows couples to define which assets will be treated as separate property and which will be community property — overriding the default 50/50 rule.

Equitable Distribution States (41 states + DC)

All other states follow equitable distribution, where marital property is divided "fairly" — but not necessarily equally — based on factors such as the length of the marriage, each spouse's earning capacity, contributions to the marriage (including homemaking), and the standard of living established during the marriage.

Because "equitable" is inherently subjective, outcomes in equitable distribution states are less predictable. A prenup removes that uncertainty by replacing judicial discretion with agreed-upon terms.

Key Enforceability Requirements

While specific requirements vary by state, most courts across the country evaluate prenups against these criteria:

Voluntariness

Both parties must enter the agreement freely, without coercion, duress, or undue influence. Courts examine the circumstances surrounding the signing: Was there adequate time to review the agreement? Was there pressure related to the wedding date? Did one party have significantly more bargaining power?

Signing a prenup the night before the wedding, under threats of cancellation, or without time for independent review are all red flags that can lead to invalidation.

Financial Disclosure

Both parties must make a full and fair disclosure of their assets, income, debts, and financial obligations. Most practitioners attach detailed financial schedules to the agreement — lists of bank accounts, investment holdings, real estate, business interests, debts, and income sources.

Failure to disclose — even unintentionally — is one of the most common grounds for invalidating a prenup. Some states allow a party to waive the right to disclosure, but this waiver itself must be knowing and voluntary.

Independent Legal Counsel

While not universally required, independent legal counsel for both parties is the single most important factor in enforceability. A prenup where both parties had their own attorney is far more likely to survive a challenge than one where only one party — or neither — was represented.

Some states, like California, effectively require independent counsel by making it very difficult to enforce certain provisions (like spousal support waivers) without it.

Fairness and Unconscionability

Courts will not enforce prenups that are unconscionable — so one-sided that enforcement would be fundamentally unjust. The standard for unconscionability varies:

• Some states evaluate fairness only at the time of signing.
• Others (particularly UPMAA states) evaluate fairness at the time of enforcement.
• A few states apply a dual standard, examining fairness at both points.

An agreement that was fair when signed may become unconscionable if circumstances change dramatically — for example, if one spouse develops a serious illness or if the marriage lasts decades longer than anticipated.

What a Prenup Can and Cannot Address

Across all US states, prenups can generally address:

• Division of property (separate and marital).
• Debt allocation.
• Spousal support (with some state-specific limitations).
• Business interests and professional practices.
• Retirement accounts and pensions.
• Life insurance and estate planning coordination.
• Financial responsibilities during the marriage.

Prenups cannot address:

• Child custody or child support. These are determined by the court at the time of divorce based on the child's best interests.
• Anything illegal or violating public policy.
• Unconscionable terms.

For a detailed breakdown, see our article on what can and cannot be included in a prenup.

State-Specific Guides

Because state law governs enforceability, we have created detailed guides for major jurisdictions:

• California — Community property state with enhanced UPAA requirements, including the seven-day rule and independent counsel mandates.
• New York — Equitable distribution state with its own statutory framework and a unique dual fairness test.
• Texas — Community property state with UPAA adoption and unique provisions for mineral rights, homestead, and informal marriage.

Each guide covers the specific legal framework, enforceability requirements, common pitfalls, and step-by-step instructions for creating a prenup in that state.

Getting Started

Regardless of which state you live in, the process of creating a prenup follows a similar path:

1. Discuss priorities with your partner. Use our prenup generator to explore what matters most to each of you.
2. Gather financial documents. Compile comprehensive records of assets, debts, income, and obligations.
3. Hire independent attorneys. Each partner needs their own family law attorney licensed in the state where you plan to marry (or reside).
4. Draft, negotiate, and finalize. Work through the terms collaboratively, with each attorney advocating for their client's interests.
5. Sign well before the wedding. Allow ample time — at least 30 days, preferably more — between signing and the ceremony.
6. Store securely and review periodically. Keep copies in a safe location and review the agreement every few years or after major life changes.

A prenup is one of the most important legal documents you will ever sign. Taking the time to understand your state's rules and working with qualified professionals ensures that your agreement protects both you and your partner, no matter what the future holds.

For more general information about prenups, see our articles on what a prenuptial agreement is, why prenups matter, and our cost guide.