Austin Postmarital Agreement Lawyers

When A Postmarital Agreement Makes Sense

Most Austin couples sign a postmarital agreement in response to a specific change, not because they expect their marriage to end. Here are the situations we help with most – and what we do in each. 

• Business launched mid-marriage. You want your equity and future earnings treated as separate property under Tex. Fam. Code §4.102, so a non-founding spouse doesn’t gain a community-property claim to half the business in a divorce. Your attorney characterizes the business and drafts terms built to protect it. 
• An inheritance or trust distribution. Inheritances are separate property in Texas, but they commingle the moment they land in a joint account. A postmarital agreement preserves the inheritance and its future income as separate property before tracing ever becomes necessary.
• Blended-family planning. With children from prior relationships, a postmarital agreement paired with a coordinated estate plan helps the assets you intend for them pass as you want, instead of defaulting to community-property rules. 
• A financial reset. When one spouse has taken on undisclosed debt, or trust has been strained, the agreement assigns responsibility clearly, protects separate property, and sets a defined path forward. 

These agreements aren’t only for high-net-worth couples, and they don’t signal a marriage in trouble. GBA’s attorneys treat a postmarital agreement as both a practical financial-planning tool and one of the most effective ways to protect important assets – a way to make your legal and financial arrangements reflect what you own, owe, and hope to preserve today. And what a postmarital agreement can cover is often broader than people realize.

What a Texas Postmarital Agreement Can and Cannot Cover

At its core, a Texas postmarital agreement is a practical tool for creating clarity around money, property, and financial responsibility within a marriage. While a postmarital agreement can address many financial matters, Texas law draws clear boundaries around what it can and cannot do. 

What it can cover:

• Partition existing community property into the separate property of one spouse, or exchange community assets so the transferred property becomes the recipient’s separate property.
• Allocate specific debts – credit cards, business loans, mortgages – to the spouse who incurred them, preventing one spouse’s obligations from being satisfied out of the other’s separate property in a divorce.
• Characterize business interests, founder equity, and future business earnings as the separate property of the founding spouse.
• Address contractual spousal support – amount, duration, and triggers – within the validity limits of §4.105.

Converting Community Property to Separate Property in Texas

One area that frequently surprises business owners, investors, and professionals involves income generated during the marriage. Under Texas’s default community property rules, income produced by separate property – such as dividends, interest, rental income, or S-corp distributions – is generally considered community property, even when the underlying asset belongs to only one spouse.

For many founders and investment property owners, it’s the key reason a postmarital agreement becomes worth considering. A written agreement under §4.103, paired with the partition mechanism in §4.102, can convert that future income into the separate property of the owning spouse. Whether you’re building a company in Austin or managing an inherited investment portfolio, that distinction can have significant long-term consequences.

Texas law also allows property to be converted in the opposite direction – from separate property to community property – under §4.202. However, doing so requires additional formalities, including a written acknowledgment of the recharacterization.

What it cannot cover:

• Child custody, visitation, or child support are determined by a Texas court under Chapter 153 and Chapter 154.
• Provisions intended to defraud creditors or that otherwise violate Texas public policy.
• Lifestyle clauses that attempt to regulate personal behavior during the marriage.

Are Postmarital Agreements Enforceable in Texas?

Yes. Texas recognizes postmarital agreements under Texas Family Code Chapter 4, Subchapter B, and a validly executed agreement is presumed enforceable. Under Tex. Fam. Code §4.105, the burden of proof rests on the spouse challenging the agreement, not the spouse seeking to enforce it.

Validity Requirements Under the Texas Family Code

A Texas postmarital agreement must be in writing and signed by both spouses. Beyond those basic requirements, enforceability depends on two additional factors: the agreement must have been entered into voluntarily, and it must have been supported by fair and reasonable disclosure of each spouse’s property and financial obligations – or an express written waiver of further disclosure, provided the waiving spouse already had adequate knowledge of the other’s finances.

Texas law does not require each spouse to have independent legal counsel. In practice, however, independent representation remains one of the strongest safeguards against a future voluntariness challenge. For that reason, GBA recommends it as a matter of standard practice.

How a Postmarital Agreement is Challenged

To invalidate a postmarital agreement, a spouse must prove one of two things: either the agreement was not signed voluntarily, or it was unconscionable at the time of signing, and the challenging spouse was not given fair financial disclosure and did not waive it in writing. Courts look closely at the circumstances surrounding execution, including timing, pressure, access to counsel, and the quality of the financial information exchanged.

Unconscionability is a question of law decided by the court rather than a jury, and the statutory remedies in §4.105 are exclusive. Once the statutory framework applies, common-law defenses such as fraud or unilateral mistake are unavailable.

One important limitation is that no postmarital agreement can waive or predetermine child support or custody arrangements. Those decisions are made by a Texas court at the time of separation under Chapter 153 (conservatorship) and Chapter 154 (support), based on the child’s best interests at that point in time.

How Postmarital Agreements Differ From Prenups in Texas

The terminology surrounding these agreements often creates more confusion than the agreements themselves. “Postmarital agreement” and “postnuptial agreement” refer to the same legal instrument – a contract signed during marriage. A partition and exchange agreement is the specific statutory mechanism many postmarital agreements use to convert community property into separate property or confirm that an asset was always separate. 

Here’s how the three types compare:

The heightened scrutiny applied to postmarital agreements does not make them more difficult to enforce. It does mean the drafting process deserves careful attention. Thorough financial disclosure, independent counsel for each spouse, and sufficient time to review and negotiate the agreement are often what distinguish an agreement that withstands scrutiny from one that does not. These safeguards are fundamental to the integrity and durability of the process.

What Working With GBA Family Law Looks Like 

Most clients want to know what the process involves before they pick up the phone. It is straightforward: 

1. Consultation. We learn your situation and what you are trying to protect. 
2. Disclosure. Both spouses share a fair picture of property and obligations – the foundation of an enforceable agreement.
3. Drafting. We characterize assets and draft terms tailored to your goals, with independent counsel for each spouse where appropriate. 
4. Review and signing. You both have time to review and negotiate, then sign an agreement built to withstand scrutiny. 

Work with GBA’s Austin Postmarital Agreement Lawyers

If you’re considering a postmarital agreement – whether to protect a business, preserve an inheritance, or bring greater certainty to your financial arrangements – the best place to start is a conversation with an attorney who handles these agreements regularly.

Goranson Bain Ausley is the largest law firm in Texas dedicated exclusively to family law, with 32 attorneys Board Certified by the Texas Board of Legal Specialization, 16 Fellows of the American Academy of Matrimonial Lawyers (AAML), three former family court judges, and two attorneys holding rare dual board certification in Family Law and Civil Appellate Law. Texas Lawyer named GBA the #1 Family Law Firm in Austin in 2025, and the firm earned Best Law Firms® (Best Lawyers®) Tier 1 rankings for Family Law and Family Law Mediation in Austin for 2026.

Kristen A. Algert, P. Lindley Bain, and Kelly Ausley-Flores lead postmarital agreement matters from GBA Family Law’s Austin office. All three are Board Certified in Family Law by the Texas Board of Legal Specialization, a credential held by fewer than 1% of Texas attorneys.

The Austin team takes a constructive, solutions-focused approach to marital agreements. The goal is to help spouses reach clear, workable agreements that protect their interests and provide confidence about the future.

Tell our Austin postmarital agreements team about your situation or call (512) 454-8791.