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Prenuptial Agreement Laws in Illinois

Illinois has adopted the Illinois Uniform Premarital Agreement Act: lack of fair disclosure matters only if the agreement was also unconscionable, and the statute sets no waiting period or independent counsel requirement.

Last checked . General information, not legal advice.

Illinois at a glance

Uniform act
UPAA (750 ILCS 10)
Financial disclosure required
Only if also unconscionable
Disclosure matters only if the agreement was also unconscionable when signed and the party had no waiver or adequate knowledge.
Waiting or review period
No statutory waiting period
The statute sets no minimum time between receiving the agreement and signing it.
Independent counsel required
No
The statute does not require either party to have a lawyer.

Sources

Last checked

The rules in Illinois

Has Illinois adopted the Uniform Premarital Agreement Act or a similar uniform law?

Uniform act in Illinois: UPAA (750 ILCS 10).

Does a prenuptial agreement in Illinois require financial disclosure to be enforceable?

Only if also unconscionable. Financial disclosure required in Illinois: only if also unconscionable. Disclosure matters only if the agreement was also unconscionable when signed and the party had no waiver or adequate knowledge.

Is there a waiting or review period before signing a prenup in Illinois?

Waiting or review period in Illinois: No statutory waiting period. The statute sets no minimum time between receiving the agreement and signing it.

Does Illinois law require each party to have an independent lawyer for a prenuptial agreement?

No. Independent counsel required in Illinois: no. The statute does not require either party to have a lawyer.

Where do the Illinois prenuptial agreement laws come from?

The rules above come from 750 ILCS 10/1 and 750 ILCS 10/7. Each source is linked on this page. We last checked them in October 2026.

Good to know

A court may order support despite a waiver if it causes undue hardship from circumstances not reasonably foreseeable when the agreement was signed.

What this means in practice

Sign well before the wedding. Courts may look closely at an agreement presented shortly before the ceremony, and some states set a minimum time between receiving the final draft and signing it. Leaving time to read, ask questions and negotiate helps show the agreement was entered voluntarily.

Exchange full financial information in writing. A schedule of each party's assets, debts and income attached to the agreement creates a record of what was disclosed. Where a party gives up the right to more information, that waiver should usually be in writing and signed as well.

Consider separate lawyers for each party. Even where independent counsel is not strictly required, having each person advised by their own attorney can make the agreement harder to challenge later. Terms about child support or custody are generally not binding, and spousal support waivers can face extra scrutiny, so a local attorney can confirm what is allowed.

General information, not legal advice. Laws change, and cities can add their own rules, so check the current statute before you rely on it.