Prenups and postnups in Texas: what makes one hold up years later

The answer depends on how it was signed

A Texas premarital or postmarital agreement generally holds up if it is in writing, signed by both spouses, signed voluntarily, and either backed by fair disclosure of each person's finances or by a knowing written waiver of that disclosure. Under the Texas Family Code, a premarital agreement is not enforceable if the person challenging it proves they did not sign voluntarily, or proves it was unconscionable when signed and that they did not receive fair disclosure, did not waive it in writing and could not otherwise have known the other person's finances. A carefully made agreement is hard to undo; a rushed one invites a fight.

I am a family law attorney at Webb Family Law in downtown Dallas, Board Certified in Family Law by the Texas Board of Legal Specialization. I draft and review marital agreements, and I also litigate the property disputes that happen when couples have no agreement, or a poorly made one. This guide explains the general framework. It is not legal advice; each person signing an agreement should have their own licensed Texas family law attorney.

What Texas generally requires for a valid agreement

Texas law lets couples define many of their financial rights through a written premarital agreement before the wedding or a postmarital agreement afterward. The agreement must be in writing and signed by both parties. Beyond those formalities, enforceability turns on the two questions in the statute: was it signed voluntarily, and was there fair financial disclosure or a knowing written waiver of it.

Section 4.006 of the Family Code also says that unconscionability is decided by the court as a matter of law, and that the defenses in that section are the exclusive defenses to enforcement. In plain terms, an agreement is not thrown out simply because one spouse later feels it was unfair. The challenge has to fit the statute, which is why the way an agreement is made matters so much.

What a marital agreement can cover

A well-drafted agreement can do much more than list who keeps what. It can change how Texas community property rules would otherwise apply to a couple, within the limits of the law. The right provisions depend on the couple's assets, goals and family circumstances.

• Identify each spouse's separate property and how it will be treated
• Characterize future income, including income from separate property
• Protect a closely held business or professional practice
• Address real estate, investment accounts and retirement savings
• Allocate responsibility for existing and future debts
• Set expectations for property division or spousal support if the marriage ends

Who should seriously consider one

A marital agreement is not only for the very wealthy. In my experience, the couples who benefit most are those with something specific to protect or a situation the default rules handle poorly. A business owner whose company would otherwise be examined and valued in a divorce is the clearest example; my guide on how a Texas divorce values and divides a business shows how much analysis that can involve without an agreement.

Others include someone expecting a significant inheritance or holding family trust interests, a spouse with children from a prior relationship who wants to preserve assets for them, a professional early in a high-earning career, and anyone bringing substantial premarital savings, real estate or debt into the marriage. For these couples, the agreement replaces uncertainty with a plan both people chose.

• Business owners and partners in professional practices
• People expecting an inheritance or holding trust interests
• Second marriages, especially with children from a prior relationship
• Spouses with significant premarital assets or debts
• Couples whose earnings or roles are expected to change sharply

Postnups: when circumstances change after the wedding

Couples who did not sign a prenup can still sign an agreement after marriage. Webb Family Law's guidance on marital agreements lists common triggers: an inheritance, the creation or sale of a business, a significant shift in earnings, or a wish to clarify ownership and management of assets. A postmarital agreement can also convert or partition property between the spouses, changing how particular assets are treated going forward.

Because married spouses already owe legal duties to one another, careful disclosure and balanced, independent review are especially important in a postnup. An agreement signed in the middle of marital trouble, without full information or separate counsel, is an agreement that is likely to be challenged.

An existing premarital agreement can be changed too. After the wedding, it can be amended or revoked only through a written agreement signed by both spouses. If your assets or family have changed significantly since you signed, a review is worth considering.

Signing mistakes that make an agreement vulnerable

Most of the agreements that end up in court share the same problems, and nearly all of them are avoidable with time and good process. Voluntariness and disclosure are where challenges focus, so those are the places to be most careful.

Timing is the most common issue. An agreement presented days before the wedding, after the venue is booked and the guests have flights, invites a claim that it was not signed freely. Disclosure is the second. A schedule of assets that leaves out an account or understates a business can undermine an agreement, especially if there was no knowing written waiver. Representation is the third: when one side's lawyer drafts the agreement and the other side never has independent advice, the record looks one-sided.

• Start months before the wedding, not weeks
• Exchange complete financial disclosures, with values and supporting statements
• Give each person their own lawyer and enough time to review and negotiate
• Keep a record of drafts, comments and changes
• Avoid terms that would leave one spouse unable to meet basic needs

Having the conversation without souring the engagement

The hardest part of a prenup is often the first conversation. I find it helps to frame it as planning rather than predicting. Couples already make plans about where to live, whether to have children and how to manage money; an agreement is one more plan, and it often makes the financial conversation more honest than it would otherwise be.

Be specific about why you want one. Protecting a family business for the next generation, or keeping an inheritance intended for children from a first marriage, is easier to discuss than a vague request. Raise it early, involve both lawyers promptly, and let each lawyer do the negotiating so the two of you do not have to argue over drafts. Many couples tell me afterward that the process clarified their finances in a way that helped the marriage.

If your partner is hesitant, listen to why. Sometimes the concern is the terms, and a lawyer can often find a structure that protects what matters to you without leaving your partner exposed, for example by sharing growth in an asset while keeping the original interest separate.

What happens if an agreement is tested in a divorce

When one spouse asks the court to enforce an agreement and the other resists, the burden is on the spouse trying to avoid it. Under section 4.006, that spouse has to prove that they did not sign voluntarily, or that the agreement was unconscionable when signed and that the disclosure requirements were not met. The question of unconscionability is for the judge.

In practice, these disputes are fought over the record made years earlier: when the draft was first delivered, how long each person had to review it, whether each had a lawyer, what financial schedules were attached and whether any waiver was signed knowingly. That is why I treat the signing process itself as evidence. A file showing months of negotiation, two lawyers and complete schedules tells a very different story from an unsigned email and a document produced the week of the wedding.

Even a sound agreement needs to be followed during the marriage. If the agreement keeps certain accounts separate but the couple mixes them freely for years, proving which funds the agreement protects can become a fight of its own.

Coordinating the agreement with the rest of your plan

A marital agreement decides what happens if the marriage ends in divorce, but most marriages end at a death, and the agreement should fit with your will, trusts and beneficiary designations. If the prenup says an asset is separate property but your estate plan leaves it to your spouse, or does not exist at all, the results may not match your intentions. Marshall Medlin's guide on what happens to a Texas family's property without a will is a useful companion read.

The agreement should also be reflected in how accounts are titled and managed during the marriage. Separate property that is mixed with community funds can become difficult to trace, even with an agreement, which I discuss in my guide on common myths about a 50/50 split in Texas.

How we approach marital agreements

At Webb Family Law we schedule confidential consultations by appointment at our office in Republic Center in Dallas, and we advise clients throughout North Texas on drafting, reviewing, negotiating and enforcing marital agreements. I start by understanding what you want to protect and why, then build a disclosure and drafting plan that gives the agreement the best chance of holding up if it is ever tested.

My background in accounting and an MBA in finance help with the financial side: valuing a business at signing, describing separate property precisely and drafting income provisions that work in practice. If you are already engaged or married and want to know whether an existing agreement is sound, I can review it with you.

Questions people ask me