By Aaron Thomas, Esq. · Updated October 28, 2026
Texas enforces what most people call a postnuptial agreement, but Texas law uses different names: partition and exchange agreements, and conversion agreements. In 2026, a postnup typically costs between $600 and $10,000 or more per couple, depending on how the agreement is created.
At Prenups.com, a postnup is a flat $4,500, or $6,500 to include negotiations with your spouse’s attorney.
Key Takeaways
- In Texas, a postnup is usually a partition and exchange agreement or a conversion agreement, governed by Tex. Fam. Code ch. 4, subchapters B and C, rather than an agreement that goes by the name “postnuptial.”
- A partition turns community property into one spouse’s separate property, an exchange swaps interests between spouses, and a conversion turns separate property into community property. In each case the spouses decide what is community and what is separate.
- Texas follows community property rules, so income earned during the marriage is shared by default. That default is predictable, but it does not keep separate property separate on its own.
- Texas law requires these agreements to be in writing and signed by both spouses. The enforcement test in Tex. Fam. Code § 4.006 is written for premarital agreements, so the requirements for a partition and exchange agreement should be confirmed by an attorney.
- A postnup can be signed at any point in a marriage. What matters is complete disclosure, separate advice for each spouse, and agreement language that says exactly what changes.
What Texas Calls a Postnuptial Agreement
Ask a Texas family lawyer about a postnup and you will often hear a different phrase. Texas law does not have a single statute titled “postnuptial agreement.” It has two kinds of agreement between spouses. A partition and exchange agreement lets spouses divide or trade property they own. A conversion agreement lets them change separate property into community property. Both sit in the same chapter of the Family Code as the premarital agreement statute, in separate subchapters.
For someone searching online, none of that terminology matters. People look for a “postnuptial agreement in Texas,” a “Texas postnup,” or a “partition agreement,” and they all mean the same thing: a written agreement between spouses about who owns what and what happens to it if the marriage ends. This post uses all of those terms.
Partition, Exchange, and Conversion: What Each Does
A partition agreement converts community property into separate property. If a spouse’s retirement account is community property, the spouses can partition it so that the account becomes that spouse’s separate property. An exchange agreement works the other way around. The spouses trade interests, so that one takes certain assets as separate property in exchange for the other taking different assets.
Texas law also lets spouses agree that income from separate property stays separate, which matters because income from a separate asset is otherwise community property. A conversion agreement runs in the opposite direction from a partition. It turns separate property into community property, which is useful when one spouse wants to share an asset they owned before the wedding.
All of these work by reclassifying specific property. Texas law requires them to be in writing and signed by both spouses, and an agreement that is vague about what moves is an agreement that can fail to change anything.
Why Reclassification Is the Point in Texas
Texas is a community property state. Income either spouse earns during the marriage is shared by default, whether or not it ever touches a joint account. That default is predictable and clean, and it applies without anyone having to prove anything. What it does not do is keep separate property separate on its own.
A spouse who owns a business or an investment account before the wedding and keeps funding it from a post-wedding paycheck can create a community interest in that asset without the other spouse contributing anything. A partition and exchange agreement lets the couple settle that question on purpose, instead of finding out in a dispute. For many couples, that is exactly the problem the agreement exists to fix.
How This Differs From a Texas Prenup
Texas follows the Uniform Premarital Agreement Act for agreements signed before the wedding. Under Tex. Fam. Code § 4.006, a challenger attacking a premarital agreement as unfair has to show both that it was unconscionable and that disclosure was inadequate. That makes Texas strongly pro-enforcement for prenups. Other grounds, such as a claim that the agreement was not signed voluntarily, remain separate.
A postnup is a different statutory animal. It sits in different subchapters, and nobody should assume the same enforcement test carries over. That is a reason to treat the process with at least the same care as a prenup, and in practice more: complete financial disclosure, a real chance for each spouse to get their own advice, and no ultimatum around the signing.
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Because these agreements work by moving specific property, precision is the whole job. Each asset that changes character should be identified, and the agreement should state clearly which direction it moves. Each spouse should give full, current financial disclosure, backed by documents. Each should have their own attorney, which is the clearest way to show both people understood what they were giving up, and both should have enough time to read and ask questions.
“In Texas the label is less important than the mechanics, because a partition and exchange agreement works by moving specific property from shared to separate, so the agreement has to say exactly what moves and both spouses have to sign,” says Aaron Thomas, Esq., founder of Prenups.com.
No agreement can promise how a particular court will rule, and anyone who says otherwise is overselling. A postnup that is enforceable in court in Texas is built from the first draft to be clear, complete, and freely chosen.
Looking for a Texas Attorney?
A search for a Texas attorney usually means one thing: someone who knows the Texas statute. The question that matters is whether the attorney is licensed and understands partition and exchange agreements, not where an office happens to be. Prenups.com is fully virtual, so Texas couples can complete the whole process online, from the first consultation through signing.
Getting a Texas Postnup
The process begins with a consultation to understand your situation and goals, followed by full financial disclosure from both spouses, drafting that identifies exactly which property is reclassified, a round of review with each spouse’s own counsel, and signing when you are both ready. Postnups at Prenups.com are a flat fee with no hourly billing, and the flat-fee pricing is published in full.
Want a Texas postnup on a flat fee? Every Texas agreement is prepared by our attorneys, including a licensed attorney as counsel of record, from the first draft through signing. Schedule a consultation. For the broader picture, see the full guide to postnuptial agreements.
Frequently Asked Questions
What is a postnuptial agreement in Texas?
It is a written agreement between spouses about who owns what and what happens to it if the marriage ends. Texas law calls the main versions partition and exchange agreements, and conversion agreements, rather than postnuptial agreements.
What is a partition and exchange agreement?
It is an agreement in which spouses divide or trade property they own. A partition turns community property into one spouse’s separate property, and an exchange swaps interests between the spouses. Texas law requires it to be in writing and signed by both spouses.
How much does a postnup cost in Texas?
In 2026, a postnup typically costs between $600 and $10,000 or more per couple, depending on how it is created. At Prenups.com, a postnup is a flat $4,500, or $6,500 to include negotiations with your spouse’s attorney.
Do both spouses need their own attorney for a Texas postnup?
It is strongly advisable. Separate counsel is the clearest way to show that each spouse understood the terms and signed voluntarily. At Prenups.com, a postnup is a flat $4,500, or $6,500 to include negotiations with your spouse’s attorney.
Is a Texas postnup the same as a prenup?
No. A prenup is signed before the wedding under the Uniform Premarital Agreement Act, with a strongly pro-enforcement test in § 4.006. A postnup is a partition and exchange or conversion agreement under different subchapters, so the requirements are different.
Do I need a Texas attorney to sign a postnup?
You need a licensed attorney who knows the Texas statute, not necessarily one with an office in Texas. Prenups.com is fully virtual, and a postnup is a flat $4,500, or $6,500 to include negotiations with your spouse’s attorney.
Sources
- Tex. Fam. Code ch. 4, subch. B (partition and exchange agreements) and subch. C (conversion agreements)
- Tex. Fam. Code § 4.006 (enforcement of premarital agreements)
- CDC/NCHS, “Stats of the States: Texas” (2023 marriage rate 5.8 per 1,000; divorce rate 2.1 per 1,000): 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” (median age at first marriage, 2025: 30.8 for men, 28.4 for women): https://www.census.gov/newsroom/press-releases/2025/families-and-living-arrangements.html
