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What are Postnuptial Agreements?

Updated July 15, 2025.

When couples get married, they usually envision a lifelong partnership filled with love, trust, and shared dreams. But sometimes, life takes unexpected turns, and even the strongest relationships encounter challenges. For couples who want to clarify financial expectations and protect individual assets after tying the knot, a postnuptial agreement may be a wise choice. While prenuptial agreements are often discussed before marriage, postnuptial agreements can be just as valuable for couples already committed to each other. Continue reading and reach out to a seasoned Rochester family lawyer from Lacy Katzen LLP to learn more about postnuptial agreements and whether drafting one may be right for you. Here are some of the questions you may have:

Why Would a Couple Consider a Postnuptial Agreement?

You might wonder why a couple would choose to create a legal agreement after marriage instead of before. The truth is, many couples don’t think about protecting their assets until they have been married for some time. In some cases, a significant change in financial circumstances, such as receiving an inheritance or starting a business, prompts the need for clear guidelines. Other times, couples simply want to update or replace an existing prenuptial agreement to better reflect their current situation.

Additionally, some couples pursue postnuptial agreements as a way to rebuild trust after difficulties in the marriage. For instance, if one spouse has made poor financial decisions or engaged in behavior that harmed the relationship, a postnuptial agreement can serve as a roadmap for accountability moving forward. By clearly outlining financial responsibilities, the agreement can help foster transparency and prevent future disputes.

What Can Couples Include in Postnuptial Agreements?

A postnuptial agreement can cover a wide range of financial and property matters, depending on the couple’s needs and goals. Typically, it addresses how assets and debts will be divided in the event of divorce or separation. It might also specify whether either spouse will receive spousal support and under what conditions. Some agreements even outline how household expenses and shared debts will be managed during the marriage itself.

However, it’s important to understand that not everything can be settled in a postnuptial agreement. Issues related to child custody, child support, or parenting time cannot be predetermined in such contracts under New York law. Courts will always prioritize the best interests of the child, regardless of what the parents may have agreed upon in writing. Because of these legal limitations, it’s crucial to work with an experienced family law attorney who can ensure the agreement is both enforceable and tailored to your specific circumstances.

How Is a Postnuptial Agreement Enforced in New York?

In New York, a postnuptial agreement must meet certain legal requirements in order to be enforceable. First and foremost, the agreement must be in writing and signed by both spouses. The signatures must also be acknowledged in the same way as a deed, meaning they need to be notarized. Beyond these formalities, the agreement must be entered into voluntarily, without coercion or duress, and it must be fair and reasonable at the time it was signed.

If a postnuptial agreement is ever challenged in court, a judge will evaluate whether both parties fully disclosed their assets and liabilities before signing. Without full financial transparency, the agreement could be considered invalid. This is why it’s so important for each spouse to have their own legal counsel review the agreement before it is finalized. Independent legal advice ensures that both parties understand their rights and obligations, reducing the likelihood of future legal challenges.

If you have further questions or would like to speak with a knowledgeable Rochester family law attorney about drafting a postnuptial agreement, simply contact Lacy Katzen LLP today.

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