Do Prenups Expire in Texas? What Every Married (and Engaged) Texan Should Know
- Robert Tsai
- Apr 23
- 6 min read
Short answer: No. A prenuptial agreement in Texas does not expire based on how long you have been married. Under the Texas Uniform Premarital Agreement Act (Texas Family Code Chapter 4), a prenup becomes effective the moment you get married and remains enforceable until the couple amends it, revokes it in a signed writing, or a court finds it unenforceable. There is no five-year rule, ten-year rule, or automatic "sunset" on a Texas prenup.
That answer surprises a lot of couples — because prenups in movies and out-of-state articles often reference time-based expirations or "sunset clauses" that simply aren't part of Texas law. If you are engaged, newly married, or have been married for decades and are wondering whether the document you signed still protects you, this guide walks through what actually happens to a Texas prenup over time.
When a Texas Prenup Becomes Effective
A prenuptial agreement in Texas — formally called a premarital agreement — is a written contract that two people enter into before they marry. Under Texas Family Code § 4.004, the agreement becomes effective on marriage. Not on signing. On the actual wedding.
That has two practical consequences most people miss:
If the wedding never happens, the prenup is void. A signed premarital agreement that is never followed by a marriage has no legal effect in Texas.
Once the wedding occurs, the clock does not start on an expiration. The agreement simply becomes live and stays live.
Does a Prenup Expire After Marriage?
No. Texas law does not impose a time limit on prenuptial agreements. There is nothing in Chapter 4 of the Texas Family Code that causes a validly executed prenup to expire after a certain number of years of marriage.
A prenup in Texas continues in force until one of three things happens:
The spouses amend it in a signed writing.
The spouses revoke it in a signed writing.
A court finds it unenforceable during a divorce or separation proceeding.
If none of those three things happen, the agreement you signed before your wedding is still the agreement that governs your marital property — whether you've been married for one year or forty.
What About "Sunset Clauses"?
This is where confusion usually starts. A sunset clause is a provision the parties themselves write into the prenup that says the agreement will expire on a specific date or after a specific event — for example, "this agreement terminates on our tenth wedding anniversary."
Sunset clauses are not required in Texas, and they are not automatic. A Texas prenup only has a sunset if the couple chose to write one in. Many people assume all prenups eventually expire because they've heard about sunset clauses in the media or from friends who signed prenups in other states. That's not how Texas law works.
If you aren't sure whether your prenup contains a sunset clause, the only way to find out is to pull the actual document and read it — or have an attorney review it with you.
How a Texas Prenup Can Be Changed or Revoked
Because Texas prenups don't expire on their own, the only way to modify or end one is through the couple's own action. Under Texas Family Code § 4.005:
An amendment or revocation of a premarital agreement must be in writing and signed by both parties.
Three things matter here:
"In writing" means a real signed document. A text message, email, or verbal agreement to ignore the prenup is not an amendment under Texas law. Couples regularly agree informally to "forget about" the prenup and are shocked in a divorce to find that the original agreement is still the one a court will enforce.
Both spouses have to sign. One spouse cannot unilaterally cancel or rewrite a prenup.
No new consideration is required. Unlike most contracts, the Texas premarital-agreement statute does not require additional consideration (money, assets, promises) to amend or revoke the prenup.
If you and your spouse want to change your financial arrangement mid-marriage, there are two clean paths: amend the existing prenup in writing, or enter into a postnuptial agreement (also governed by the Texas Family Code — see our page on postnuptial agreements).
When a Court Will Refuse to Enforce a Prenup
Even though a Texas prenup does not expire with time, it can still be found unenforceable at divorce. Under Texas Family Code § 4.006, a premarital agreement is unenforceable if the spouse challenging it proves either of the following:
The agreement was not signed voluntarily, or
The agreement was unconscionable when it was signed AND the challenging spouse was not given (and did not waive) fair and reasonable disclosure of the other party's property and financial obligations, and did not have (or could not reasonably have had) adequate knowledge of those finances.
A few things to know:
A prenup is not automatically thrown out because it is "unfair" at divorce. Texas courts evaluate unconscionability as of the time the prenup was signed, not at the time of divorce.
Signing the day before the wedding, with no lawyer, under pressure, with undisclosed assets is the classic fact pattern where a prenup fails.
Signing thirty days out, after full financial disclosure, with each side represented by independent counsel, is the fact pattern where a prenup almost always stands.
The takeaway: the age of the prenup doesn't matter nearly as much as how it was signed.
What If You Never Signed a Prenup? Postnuptial Agreements
If you're already married and wishing you had signed a prenup, Texas law gives you a second option: a postnuptial agreement (also called a marital property agreement). Under the Texas Family Code, married spouses can agree to partition or exchange community property into separate property, and can convert future income from separate property into separate property, by a signed written agreement.
Postnups aren't for every couple — they require the same care and disclosure as a prenup — but they are a legitimate and commonly used tool when circumstances change (inheritance, business growth, new children, a move to Texas from a non-community-property state).
For more, see our overview of postnuptial agreements and our guide on key considerations for marital agreements in Texas.
Five Situations That Should Trigger a Prenup Review
Even though your prenup doesn't expire, the world around it changes. We recommend reviewing your premarital agreement with an attorney when:
You start or sell a business. Characterization of business interests is one of the most complex issues in a Texas divorce. A prenup drafted before the business existed may not address it cleanly.
You receive or expect a significant inheritance. Make sure the prenup's treatment of separate property still reflects your intent.
You move to Texas from another state. Community property rules are different here, and a prenup drafted under another state's law may interact with Texas law in surprising ways.
You've been married ten or more years. Not because the prenup has expired — it hasn't — but because the assets, debts, and expectations in the agreement may be a decade out of date.
Your spouse brings it up. If the conversation is starting to happen, it's better to handle the review on calm ground than during a dispute.
Talk to a Texas Family Law Attorney
Prenups are deceptively simple documents that govern enormous amounts of money and a significant portion of your life. A Texas prenup doesn't expire — but that also means a weak one doesn't fix itself. Whether you are engaged and preparing to sign, married and wondering what yours says, or thinking about a postnup because you never signed one to begin with, a short conversation with an attorney is usually the cheapest part of the process.
Robert Tsai has worked with Texas couples on premarital and marital property agreements for over two decades. If you'd like a prenup reviewed, amended, or drafted from scratch, you can contact the firm to set up a consultation.
Frequently Asked Questions
Do prenups expire in Texas after a certain number of years?
No. Texas prenuptial agreements do not expire based on how long the couple has been married. Under Texas Family Code Chapter 4, a prenup becomes effective on marriage and remains in force until the spouses amend it in writing, revoke it in writing, or a court finds it unenforceable.
Does a prenup automatically expire after 10 years of marriage in Texas?
No. There is no 10-year rule, 7-year rule, or any other automatic time-based expiration in the Texas Uniform Premarital Agreement Act. A prenup only expires if the couple wrote a sunset clause into the agreement themselves.
Can a prenup be changed after marriage in Texas?
Yes. Texas Family Code § 4.005 allows spouses to amend or revoke a premarital agreement at any time by a signed writing. No additional consideration is required. Verbal agreements and informal understandings are not sufficient.
What makes a Texas prenup unenforceable?
Under Texas Family Code § 4.006, a prenup is unenforceable if the challenging spouse proves it was not signed voluntarily, or that it was unconscionable when signed AND the challenging spouse did not receive fair and reasonable financial disclosure (or waive disclosure) and did not have adequate knowledge of the other party's finances.
If I'm already married and never signed a prenup, what can I do?
Texas allows married couples to enter into a postnuptial agreement (also called a marital property agreement) to partition or exchange community property, or convert future income from separate property into separate property. A postnup requires the same care, disclosure, and voluntary execution as a prenup.
Published by the Law Office of Robert Tsai. This post provides general information about Texas family law and is not legal advice. For guidance on your specific situation, contact the firm to schedule a consultation.