Is It Too Late for a Postnup If We Are Considering Divorce?

 Posted on July 30, 2026 in Prenuptial and Postnuptial Agreements

A postnuptial agreement can help married couples decide how certain financial matters will be handled if they later divorce. If you and your spouse are already considering divorce, you may wonder whether it is too late to negotiate one.

A postnup may or may not be a viable option depending on the circumstances. However, even if you’ve missed the ideal window for drafting a postnuptial agreement, a Chicago postnuptial agreement lawyer can help you understand other possibilities for maintaining control of your assets if your marriage ends.

Can You Still Sign a Postnuptial Agreement If You’re Considering Divorce in Illinois?

Illinois spouses can enter into a postnuptial agreement after marriage. However, if divorce is already expected, the agreement’s purpose and the circumstances surrounding its execution may affect how it is classified and enforced.

However, signing a postnup very close to beginning a divorce can pose some problems. Unlike prenuptial agreements, Illinois postnuptial agreements are not governed by the Illinois Uniform Premarital Agreement Act (750 ILCS 10/). Courts generally evaluate them under contract principles, while the Illinois Marriage and Dissolution of Marriage Act expressly recognizes valid postnuptial agreements when classifying and dividing property.

What Makes for a Valid Postnuptial Agreement in Illinois?

A postnup must typically meet a few criteria to be considered valid in Illinois. A valid postnup should:

• Be supported by consideration, meaning each spouse gives or promises something of legal value
• Be signed voluntarily by both parties without coercion or force
• Include a fair and reasonable disclosure of the property or finances of both parties
• Contain sufficiently clear terms
• Not be "unconscionable," or so unfair as to be one-sided

Timing alone does not necessarily invalidate a postnup. However, an agreement signed under pressure, without enough time for review, or without adequate financial information may be challenged later. Courts want to see that both people entered the agreement freely, with full knowledge of each other's finances.

When Is It Too Late to Draft a Postnup?

If you and your spouse are discussing divorce but haven't filed yet, a postnup may still serve its purpose. This is especially true if you're hoping to work things out and stay married. If you are confident that your marriage is headed toward divorce, your energy may be better spent negotiating a settlement agreement.

If both spouses expect the marriage to end and are negotiating the actual terms of an upcoming divorce, a marital settlement agreement may be more appropriate. An attorney can determine which type of agreement fits the couple’s circumstances and goals.

How Does an Illinois Postnuptial Agreement Differ from a Divorce Settlement Agreement?

A postnuptial agreement can establish certain financial rights, including how specified property or maintenance will be treated. A marital settlement agreement negotiated in connection with a divorce can address property division, maintenance, and other divorce terms. Spouses may also propose terms concerning child support and parental responsibilities, but the court must evaluate child-related provisions under Illinois law.

If you and your spouse miss the opportunity to draft a postnuptial agreement, remember that you will not necessarily have to go straight to having your assets divided by a court. Illinois law allows divorcing spouses to negotiate a written settlement covering many of the issues in their case. If the court approves the agreement, its terms may be incorporated into the divorce judgment. If you and your spouse are still on fairly amicable terms, this may be a viable way to maintain control over the division of your assets in lieu of a postnuptial agreement.

Call Our Rolling Meadows, IL Postnuptial Agreement Lawyer Today

Whether you are hoping to write up a postnup or feel confident moving into divorce proceedings, The Law Offices of Curtis Bennett Ross, L.L.C. can help. Attorney Curtis Ross has practiced family law in the Chicago area for more than 40 years. As a licensed CPA, court-appointed guardian ad litem, and trained mediator, he offers a unique combination of skills for addressing financial issues and finding workable solutions for all parties.

Call 312-984-1514 to schedule a free limited consultation with our Chicago family law attorney today.