My Fiancé Won't Sign a Prenup. Should I Wait for a Postnup?

 Posted on March 20, 2026 in Prenuptial Agreements

You've brought up the idea of a prenuptial agreement, but your fiancé isn't on board. Now you're wondering whether to drop it entirely or push harder. There’s also a third option: revisit the conversation after the wedding dust has settled a bit. Many couples that don’t sign prenups do eventually end up signing a postnuptial agreement.

It can be hard to balance the desire to protect your assets with making sure your partner feels secure about the relationship. A Naperville family law attorney can help you think through your options and decide which route you should take.

Are There Any Differences in What a Prenuptial and Postnuptial Agreement Covers in Illinois?

For the most part, both a prenup and a postnup can address the same things, including:

• Determining what property is marital and what is individual
• Allocation of debts
• Spousal maintenance (also called alimony) amounts
• Ownership of a business or investment assets
• Ownership of pets

The main difference is timing: A prenup is signed before the wedding, a postnup is signed after.

What neither agreement can do is set terms for child custody or child support. Only Illinois courts can decide those matters based on the best interests of the child at the time of divorce.

Does the State of Illinois Recognize Postnuptial Agreements?

Illinois courts recognize and enforce postnuptial agreements, though there’s no single statute dedicated to them the way there is with prenups (750 ILCS 10/1 et seq.). Postnups are evaluated under general contract principles and the Illinois Marriage and Dissolution of Marriage Act (IMDMA).

For a postnup to hold up in court, it must meet these requirements:

• Both spouses must sign it voluntarily, without pressure or coercion
• Both parties must fully disclose their assets, income, and debts
• The agreement must be in writing and signed by both parties
• The terms can’t be "unconscionable" 

If one spouse didn’t have independent legal counsel, signed under pressure, or was not given full financial information, a court may throw the agreement out. Each party having their own attorney review and negotiate the postnup is strongly advisable, as courts will scrutinize postnups very closely.

Should You Push for a Postnup If Your Fiance Didn’t Want a Prenup?

This depends mostly on why your fiancé is resistant to a prenup in the first place.

If your fiancé is uncomfortable because a prenuptial agreement feels unromantic or like you're planning for divorce, that conversation might be easier to revisit once you're married and the wedding pressure is behind you. Some couples find it easier to talk about finances and future planning after they've settled into married life together. If your fiancé has a fundamental objection to any pre-planned agreement about the division of property, a postnup may not be any more successful.

It’s important to talk to each other and get to the root of why your fiance pushed back. This can be a good opening for you to better explain your reasons for wanting a prenup in the first place. If your fiancé understands that pre- and postnups are as much about clear expectations as they are about contingency planning (and that you’re not planning on running away right after the wedding), they may find that they’re not so opposed to signing after all.

Postnuptial Agreements Later in Marriage

Many people find that postnups are a good idea even after many years of marriage. An inheritance or a new business may produce unexpected money. One spouse may return to work after years at home. In some cases, the couple just wants to revisit and update earlier agreements.

What Happens if We Get Divorced Without a Pre or Postnuptial Agreement?

Without a prenup or postnup, Illinois law controls how property is divided if you divorce. The court will divide marital property equitably. The court weighs factors like length of marriage, each spouse's income and contributions, and other circumstances.

If protecting specific assets matters a lot to you, having some form of agreement in place is better than relying on a court to sort it out later.

Call a DuPage County, IL Family Law Attorney Today

At Pesce Law Group, P.C., our Naperville postnuptial agreement lawyers have nearly two decades of legal experience helping Illinois couples with legal matters. We can help you and your fiancé understand the realities of pre- and postnuptial agreements in 2026. We offer free consultations so you can get clear answers before making any decisions. Call Pesce Law Group, P.C. at 630-352-2240 to schedule yours today.