Prenuptial Agreements in Texas: What the Family Code Requires

By Aaron Thomas, Esq. · Updated October 28, 2026

A Texas prenuptial agreement must be in writing and signed by both partners. Texas does not require witnesses or separate attorneys, and once signed, a Texas prenup is hard to overturn: under Texas Family Code § 4.006, the challenger has to prove involuntary signing, or unconscionability combined with a complete failure of financial disclosure.

Key Takeaways

• A prenuptial agreement in Texas is governed by Chapter 4 of the Texas Family Code, the state’s version of the Uniform Premarital Agreement Act. It must be a written agreement signed by both partners. Witnesses are not required, and neither is a separate attorney for each partner.
• Under § 4.006, a Texas prenup is unenforceable only if the challenger proves it was signed involuntarily, or that it was unconscionable when signed and that, before signing, the challenger received no fair and reasonable disclosure, did not voluntarily and expressly waive disclosure in writing, and had no adequate knowledge of the other partner’s finances.
• The court decides unconscionability as a matter of law, the statutory defenses are exclusive, and fairness is judged at signing, not at divorce.
• Texas is a community property state, and income from separate property, such as rent, dividends, and interest, is community property by default unless the spouses agree in writing to keep it separate.
• Already married? Texas spouses use partition and exchange agreements, which must be in writing and signed by both spouses and are enforced under the same test.

What a Prenuptial Agreement in Texas Requires

The formal requirements are short. A Texas prenup is a written agreement signed by both partners. Texas does not require witnesses, and it does not require each partner to have an attorney. Notarization is not a statutory requirement for a Texas prenup, but it is good practice, because it creates a clean record that each partner signed.

What the statute does not require still matters in practice. Each partner having independent counsel, full written financial disclosure, and enough time to review the agreement are what make the document hard to challenge later. The statute sets the minimum; the record behind the agreement is what protects it.

Why Texas Prenups Are So Hard to Overturn

Texas Family Code § 4.006 is a strongly pro-enforcement test, which is why it pays to read it in full. A Texas premarital agreement is unenforceable only if the partner challenging it proves one of two things.

The first is that they did not sign voluntarily. The second has two parts that must both be true. The agreement was unconscionable when it was signed, and before signing, the challenger (A) was not provided fair and reasonable disclosure of the other partner’s property or financial obligations, (B) did not voluntarily and expressly waive, in writing, any right to disclosure beyond what was provided, and (C) did not have, and reasonably could not have had, adequate knowledge of the other partner’s property or financial obligations.

Three more features make the test even harder to meet. Unconscionability is decided by the court as a matter of law. The defenses in § 4.006 are exclusive, so a challenger cannot add new grounds. And the burden is on the challenger. Fairness is measured when the agreement is signed, so a deal that looks lopsided twenty years later is not unconscionable for that reason alone.

The lesson for couples is about disclosure. Because the unfairness route requires all three disclosure failures, a complete, documented financial disclosure closes it almost entirely. That is the step that turns a strong statute into a strong agreement. Whether prenups are really enforceable is a common worry; in Texas, the answer depends mostly on the record the two of you create at signing.

Community Property and the Separate-Income Trap

Texas is a community property state. By default, property acquired during the marriage, other than separate property, is community property, and anything either spouse holds during the marriage or at divorce is presumed to be community. A spouse who claims otherwise has to prove it by clear and convincing evidence.

Texas adds a rule that surprises most couples. Income generated by separate property, such as rent from a house owned before the wedding, dividends from an inherited portfolio, or interest on premarital savings, is community property by default. The Texas Constitution allows spouses to agree in writing that this income stays separate, and in Beck v. Beck (1991), the Texas Supreme Court upheld a premarital agreement that did exactly that.

Here is how the default plays out. Elena owns a rental duplex before she marries Marcus. The rent she collects during the marriage is community property by default. If she deposits the rent into the account that also holds her premarital savings, the funds are commingled, and she carries the burden of tracing which dollars were separate. If community income pays down the duplex mortgage, the community estate may have a reimbursement claim against her separate property. A prenup can classify the rent as Elena’s separate property and set how any contribution to the duplex is credited, before a single dollar moves.

The community property default is predictable, but it does not keep separate property separate on its own. The agreement is what does that, and it is worth understanding how community property versus equitable division shapes the starting point.

Already Married: Partition and Exchange Agreements

Texas does not use the word “postnup” in its statute. Spouses who want to divide community property, or agree that income from separate property stays separate, sign a partition and exchange agreement under §§ 4.102 to 4.106. It must be in writing and signed by both spouses, it does not require consideration, and it is enforced under the same test as a premarital agreement.

In 2024, Texas recorded roughly 181,000 marriages, according to CDC/NCHS data. That is a single year’s count of couples starting under the community property default. Couples marry later than they used to: in 2025, the median age at first marriage was 30.8 for men and 28.4 for women, according to the U.S. Census Bureau. More of them arrive with rental property, investment accounts, and businesses that generate exactly the kind of separate-property income Texas treats as community.

“Texas gives couples a strongly pro-enforcement prenup statute, but the statute only protects what the agreement actually says. If you own anything that earns income, the agreement has to say in writing that the income stays separate,” says Aaron Thomas, Esq., founder of Prenups.com.

Getting a Prenup in Texas

The process starts with a consultation to understand what each of you owns and earns. Full written financial disclosure follows, then drafting, review with each partner’s own counsel, and signing. At Prenups.com, a prenup is a flat $3,500, or $5,000 to include negotiations with your partner’s attorney. The full flat-fee pricing is published, with no hourly billing.

Want a Texas prenup on a flat fee? Every Texas agreement is prepared by our attorneys, including a Texas-licensed attorney as counsel of record, from the first draft through signing. Schedule a consultation.

Frequently Asked Questions

Sources

• Tex. Fam. Code §§ 3.002, 3.003, 3.402, 4.006, and 4.102 to 4.106 (community property; presumption; reimbursement; enforcement of premarital agreements; partition and exchange)
• Tex. Const. art. XVI, § 15 (separate property; agreements that income from separate property remains separate)
• Beck v. Beck, 814 S.W.2d 745 (Tex. 1991) (premarital agreement keeping income from separate property separate upheld)
• CDC/NCHS, “Stats of the States: Texas” (marriage rate per 1,000 residents, 2024): https://www.cdc.gov/nchs/state-stats/states/tx.html
• U.S. Census Bureau, “Census Bureau Releases New Estimates on America’s Families and Living Arrangements” (Dec. 2, 2025) (median age at first marriage): https://www.census.gov/newsroom/press-releases/2025/families-and-living-arrangements.html