What Is a Postnuptial Agreement and How Does It Work?

By Waple & Houk PLLC | Charlotte Family Law Attorneys | Updated 2026

Most people have heard of a prenuptial agreement — the contract couples sign before getting married to outline how assets and finances would be handled if the marriage ends. But what many people don’t realize is that a similar agreement is available after the wedding too. A postnuptial agreement, sometimes called a postnup or post marital agreement, serves much the same purpose, just with a different timeline.

If you’re already married and wondering whether a postnuptial agreement makes sense for your situation, this guide covers what they are, how to get one, what makes them valid in North Carolina, and whether they’re legally binding.

Postnuptial Agreement Meaning: What Is It?

A postnuptial agreement is a legally binding contract entered into by two married spouses that outlines how their assets, debts, and finances will be handled in the event of a divorce or the death of one spouse. In some cases, a postnup also addresses how the couple will manage finances during the marriage itself.

Like a prenuptial agreement, both parties must fully disclose their financial situations — assets, income, and liabilities — before signing. The difference is simply timing: a prenup is signed before the wedding, while a postnup is signed after.

Postnuptial agreements can cover a wide range of financial matters, including:

• How property and assets acquired during the marriage will be divided upon divorce
• Protection of assets one spouse owned before the marriage
• How a family business or professional practice will be treated
• Spousal support or alimony terms
• Inheritance rights and estate planning considerations
• Financial responsibilities and debt allocation during the marriage

Postnuptial vs. Prenuptial Agreement: What’s the Difference?

The core function of a prenuptial agreement and a postnuptial agreement is the same. Both establish financial terms for a potential divorce before that divorce actually happens. The key differences come down to timing, leverage, and the circumstances that lead couples to seek them.

Prenups are signed before the wedding, when both parties are still free to walk away if they don’t like the terms. This gives each party a certain amount of negotiating power. Postnups are signed during the marriage, which changes the dynamic somewhat. Courts tend to scrutinize them more carefully to ensure neither spouse was pressured into signing.

Common reasons couples pursue a postnuptial agreement instead of, or in addition to, a prenup include:

• They didn’t get around to a prenup before the wedding
• A significant financial change occurred during the marriage — an inheritance, a business launch, or a major asset purchase
• One spouse wants financial protections after discovering the other’s infidelity
• The couple wants to renegotiate or update the terms of an existing prenuptial agreement
• They want to get on the same page financially after a period of conflict or uncertainty in the marriage

How to Get a Postnuptial Agreement in North Carolina

Getting a postnuptial agreement in North Carolina involves several steps. While it’s technically possible to draft one without an attorney, the validity requirements are strict — and a poorly drafted postnuptial is unlikely to hold up in court when it matters most.

Here’s how the process typically works:

• Both spouses agree to enter the agreement. A postnuptial cannot be forced on either party. Both spouses must willingly participate from the start.
• Full financial disclosure is made by both parties. Each spouse must fully disclose their assets, income, and debts. Hiding or omitting financial information can invalidate the entire agreement.
• The terms are negotiated. Both spouses — ideally each represented by their own attorney — work out what the agreement will cover and on what terms.
• The agreement is drafted in writing. Oral postnuptial agreements are not valid in North Carolina. The agreement must be a written document.
• Both spouses sign voluntarily. Signatures must be given freely, without coercion or pressure. Both spouses should have adequate time to review the agreement before signing.
• The agreement is notarized. North Carolina requires notarization for a postnuptial agreement to be validly executed.

Having separate attorneys for each spouse is strongly recommended. Courts look favorably on agreements where both parties had independent legal counsel, and it significantly reduces the chances the agreement will be challenged later.

Ready to get started? Our Charlotte family law attorneys can draft a postnuptial agreement that meets all of North Carolina’s requirements and reflects your specific financial situation. Contact us for a confidential consultation.

What Makes a Postnuptial Agreement Valid in North Carolina?

North Carolina courts take a hard look at postnuptial agreements before enforcing them — in part because the state’s equitable distribution law governs how marital property is divided, and a postnup effectively overrides that law. For a postnup to be enforceable, it must meet all of the following requirements:

• Written: The agreement must be in writing. Verbal agreements have no legal standing.
• Voluntary: Both parties must sign willingly. If one spouse can demonstrate they were pressured, threatened, or coerced into signing, the agreement can be voided.
• Full financial disclosure: Both spouses must fully disclose their financial situation — assets, income, and liabilities. Incomplete or misleading disclosure is grounds for invalidation.
• Fair and reasonable: A postnup that is heavily one-sided or leaves one spouse in an unjust position may not be enforceable, even if both parties signed it.
• Properly executed: The agreement must be signed and notarized in accordance with North Carolina law.

Even a properly executed postnup isn’t guaranteed to be upheld in every circumstance. If the court finds that one party wasn’t given the opportunity to review the terms with their own attorney, or that the disclosure wasn’t truly complete, it may decline to enforce the agreement — or strike it down entirely.

Are Postnuptial Agreements Legally Binding in North Carolina?

Yes — when properly drafted and executed, a postnuptial agreement is legally binding in North Carolina. However, courts scrutinize these agreements more closely than prenups, given that the parties are already married at the time of signing.

A postnup is most likely to be upheld when both spouses had independent legal counsel, full financial disclosure was made, neither party was under duress, the terms are reasonably fair, and the agreement was properly notarized. An agreement that cuts corners on any of these points is at real risk of being thrown out at exactly the moment you need it most.

Frequently Asked Questions About Postnuptial Agreements

Can a postnuptial agreement be challenged or overturned?

Yes. A postnuptial agreement can be challenged on several grounds — coercion, fraud, incomplete financial disclosure, unconscionable terms, or failure to meet North Carolina’s execution requirements. This is why working with an experienced family law attorney from the start is so important. A well-drafted agreement is far harder to successfully challenge.

Does a postnuptial agreement affect child custody or child support?

No. Postnuptial agreements cannot predetermine child custody or child support arrangements. Courts retain full authority over these issues and will always decide them based on the best interests of the child at the time of divorce — not based on what the parents agreed to years earlier.

What happens if we don’t have a postnuptial agreement?

Without a postnup, North Carolina’s equitable distribution law applies — meaning marital property is divided fairly (though not necessarily equally) by the court. If you have specific assets you want to protect, or you and your spouse want to agree on financial terms in advance, a postnuptial agreement gives you control over that outcome rather than leaving it to a judge.

Is a postnuptial agreement only for couples considering divorce?

Not at all. Many couples enter into postnups simply to get on the same financial page — not because they’re planning to divorce. A postnup can reduce financial conflict during the marriage, clarify each spouse’s rights to certain assets, and provide peace of mind for both parties regardless of how the marriage ultimately unfolds.

Talk to a Charlotte Family Law Attorney About a Postnuptial Agreement

Just because you didn’t get a prenup before your wedding doesn’t mean your options are limited. A well-drafted postnuptial agreement can protect both spouses, reduce financial conflict, and provide clarity if the marriage ever ends. At Waple & Houk PLLC, our Charlotte family law attorneys can help you understand whether a postnup makes sense for your situation and draft an agreement that will hold up in court.