A Texas prenuptial agreement can settle a great deal about a couple’s finances: what stays separate property, how income earned during the marriage is treated, whether either spouse pays spousal support. But that freedom is not unlimited. A Texas prenuptial agreement cannot limit or waive child support, predetermine child custody or conservatorship, or require illegal conduct or terms that violate public policy. A court can also refuse to enforce the whole agreement if it was unconscionable when it was signed. Unconscionable means so one-sided that enforcing it would be unfair. That usually also requires showing the challenging spouse was not given a fair picture of the other spouse’s finances. These limits apply regardless of how clearly a provision is written or how willingly both parties agreed to it. Understanding these boundaries before drafting an agreement prevents unenforceable terms and unmet expectations later.
Child Support Cannot Be Limited or Waived
A premarital agreement may not adversely affect a child’s right to support. Under Texas Family Code § 4.003(b), this rule applies regardless of what the couple agrees to or how the provision is worded. The legal right to support belongs to the child, not to either parent, meaning parents cannot contractually waive or reduce it in advance.
If a couple later divorces, a Texas court calculates child support based on statutory guidelines, the parents’ financial circumstances, and the child’s needs at that time. A prenup provision capping, waiving, or otherwise limiting future child support will not be enforced, even if both spouses signed the agreement without objection.
Custody and Conservatorship Cannot Be Predetermined
Texas law does not allow parents to lock in future conservatorship (the Texas legal term for custody rights and duties), possession, or access arrangements through a premarital agreement. Under Texas Family Code § 153.002, Texas courts determine conservatorship, possession, and access based on the child’s best interest at the time the determination is made. Because that standard requires evaluating the circumstances that exist when custody is actually being decided, an agreement signed years earlier cannot bind the court.
A prenup cannot name one parent as the primary conservator in advance, restrict the other parent’s access, or settle custody questions before a child is born. If a premarital agreement includes these terms, a court reviewing the agreement during a divorce will set those specific provisions aside and decide custody independently.
Provisions That Violate Public Policy or the Law
A premarital agreement cannot require illegal conduct or include terms that violate public policy. A court will not enforce a provision requiring a spouse to break the law, conceal a crime, or act in a manner that conflicts with Texas criminal statutes.
Public policy limits also apply to provisions that are not criminal on their face. For example, contractual terms designed specifically to encourage or financially incentivize divorce, rather than to plan responsibly for the possibility of dissolution, face judicial scrutiny and invalidation.
When an Entire Agreement Can Be Unenforceable: Unconscionable or Undisclosed Terms
Beyond restrictions on specific clauses, Texas law allows a spouse to challenge an entire agreement on procedural grounds. Under Texas Family Code § 4.006, a court can set aside an agreement as unconscionable if it was unconscionable when signed and the challenging spouse proves all of the following:
- They did not receive a fair and reasonable disclosure of the other spouse’s property and financial obligations;
- They did not voluntarily and expressly waive that disclosure in writing; and
- They did not otherwise have adequate knowledge of the financial circumstances.
Section 4.006 also permits a challenge if a spouse did not sign the agreement voluntarily. An agreement is not automatically unenforceable simply because it heavily favors one spouse or because one spouse later regrets signing it. The unconscionability standard requires showing both a grossly one-sided process and a lack of fair financial disclosure at the time of execution.
Personal and Lifestyle Provisions
Couples sometimes want to include non-financial terms about personal conduct. Examples include who handles which household chores, how often in-laws may visit, which holidays are spent with which side of the family, rules about posting on social media, or a requirement that a spouse maintain a certain weight.
Texas law does not flatly forbid these terms. Family Code § 4.003(a)(8) allows a premarital agreement to address “personal rights and obligations,” so long as the term does not violate public policy or a criminal statute. As a practical matter, though, courts will not enforce them. A judge is not going to order a spouse to do the dishes, and there is no sensible way to put a dollar value on the breach. Terms like these are better understood as a statement of expectations than as anything a court will act on.
Infidelity provisions, however, present a distinct legal issue. Texas recognizes adultery as a fault-based ground for divorce under Family Code § 6.003, and proven fault is one factor Texas courts may weigh under the ‘just and right’ property division standard in Family Code § 7.001. Courts evaluate financial infidelity penalties in prenups on a case-by-case basis, considering how clearly the clause is drafted and whether it applies mutually. A judge retains discretion over final property division and is not strictly bound to apply a contractual penalty as written.
Building an Agreement Around Enforceable Financial Terms
These legal boundaries do not prevent a prenup from providing substantial financial protection. A Texas premarital agreement can still establish how property and debts will be divided, preserve separate assets, dictate how business interests are handled, and resolve future spousal maintenance questions. Focusing the agreement on enforceable financial matters provides both parties with clarity and legal certainty.
Couples evaluating whether a postnuptial agreement fits their situation instead of a prenup will find that both documents address similar financial topics, with the timing of execution being the primary distinction.
Since 1982, Bailey & Galyen Attorneys at Law has guided individuals and families across Texas through prenuptial and postnuptial planning with large-firm resources and personal attention.
Call Bailey & Galyen to Discuss Your Texas Prenuptial Agreement
Contact Bailey & Galyen to discuss what can and cannot be included in your premarital agreement and learn what options may be available. The firm offers free consultations for family law matters, and someone is available 24/7 to help you get started.
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