Indiana Prenuptial Agreement Requirements and Enforcement

A prenuptial agreement in Indiana lets an engaged couple decide in advance how property, debts, spousal maintenance, and inheritance rights will be handled, replacing the state’s default rules with their own terms. The agreement is governed by Indiana’s Uniform Premarital Agreement Act at Indiana Code 31-11-3-1 through 31-11-3-10.¹ Without one, a divorce court starts from a presumption that marital property should be divided equally and decides any spousal maintenance on its own.² A prenup is how you lock in a different outcome before the wedding.

What You Can Put in the Agreement

Indiana gives couples wide latitude over financial terms. Under the UPAA, a prenup can address:³

Each spouse’s rights in property, regardless of when or where it was acquired.
Who manages, buys, sells, mortgages, or leases specific assets during the marriage.
How property will be divided on separation, divorce, or death.
Whether spousal maintenance will be modified or eliminated.
Obligations to create a will, trust, or other arrangement that carries out the agreement.
Ownership and beneficiary designations for life insurance.
Which state’s law governs interpretation.
Any other lawful matter that does not violate public policy or criminal law.

“Property” in the statute reaches broadly, covering present and future interests, vested or contingent, including income and earnings.⁴ A prenup can therefore reach future business income, unvested stock options, and retirement benefits earned during the marriage.

One subject is off limits. A prenup cannot adversely affect a child’s right to support.³ Any clause attempting to waive or cap child support is unenforceable. Courts set support based on the child’s needs at the time, and parents cannot bargain that away before a child exists.

Formal Requirements for a Valid Prenup

The formalities are short. The agreement must be in writing and signed by both parties, and no separate consideration is needed because the promise of marriage itself supports the contract.⁵ The agreement only takes effect when the marriage actually occurs.¹ If the wedding is called off, the prenup never activates.

Indiana does not require notarization. Having both signatures notarized is still a sensible precaution because it creates independent verification of identity, but it is not a legal prerequisite.

What Makes a Prenup Hold Up in Court

Formal validity is the easy part. The harder question is whether the agreement will survive a challenge during a divorce years later. Two practices do most of the work: full financial disclosure and independent legal counsel.

Financial Disclosure

Transparency is the practical backbone of enforceability. Each party should prepare an honest, detailed schedule of assets and debts — real estate, retirement accounts, business interests, outstanding loans — and attach it to the agreement. If one spouse later shows the other hid assets or misrepresented their finances, a court is far more likely to set the agreement aside.

A party can waive full disclosure, but the waiver must be in writing, voluntary, and express, and the waiving party must either already have adequate knowledge of the other spouse’s finances or reasonably be able to obtain it. Skipping disclosure without a proper written waiver is one of the fastest ways to lose a prenup.

Independent Counsel

Indiana does not require each party to have their own attorney. But prenups that get challenged in court almost always involve a spouse who signed without legal representation. When both parties have separate counsel, arguments about coercion or misunderstanding become much harder to sustain. For an agreement protecting significant assets, a second attorney is inexpensive insurance.

When a Court Can Throw the Agreement Out

Even a properly signed prenup can be refused enforcement if the challenging spouse proves one of two things under Indiana Code 31-11-3-8:⁶

The spouse did not sign the agreement voluntarily. Courts look at the full picture: pressure, timing (an agreement sprung on someone days before the wedding is a red flag), and whether both parties had time to review the terms.
The agreement was unconscionable when it was signed. A judge decides this as a matter of law, evaluating whether the terms were so one-sided that no reasonable person would have agreed to them under the circumstances.

Timing matters. Indiana evaluates unconscionability as of the signing, not the divorce. An agreement that was fair when signed does not become unconscionable just because one spouse’s finances changed dramatically during the marriage.

The Spousal Maintenance Safety Valve

A prenup can modify or eliminate spousal maintenance, but the statute carves out one exception. If a maintenance waiver would cause one spouse extreme hardship under circumstances that were not reasonably foreseeable when the agreement was signed, a court can override the waiver and order maintenance to the extent necessary to avoid that hardship.⁶

The bar is high. The hardship must be extreme, not merely inconvenient, and the triggering circumstances must have been unforeseeable at signing. A spouse who develops a severe disability during a long marriage may qualify. A spouse who simply earned less than hoped probably will not. Couples who want a maintenance waiver to stick should acknowledge foreseeable risks in the agreement itself, which narrows the window for a later hardship claim.

Waiving Inheritance and Elective Share Rights

Indiana lets a spouse waive statutory inheritance rights through a prenup, and two separate probate provisions govern this. A spouse’s right to take an elective share against the other spouse’s will can be waived before marriage by a written agreement signed by the waiving party, after full disclosure of the nature and extent of that right.⁷ The promise of marriage counts as sufficient consideration.

Similarly, a spouse’s intestate share — what they would inherit if the other dies without a will — can be waived by a written agreement signed by the waiving party, with full financial disclosure and fair consideration.⁸ These waivers are common in second marriages where each spouse wants their estate to go to children from a prior relationship.

Disclosure is especially demanding here. The probate provisions require “full disclosure of the nature and extent of such right” for the waiver to bind.⁷ A vague summary of assets is unlikely to satisfy that standard.

Changing or Canceling the Prenup After the Wedding

Life changes, and the statute provides a mechanism. A premarital agreement can be amended or revoked only by a written agreement signed by both spouses, with no additional consideration required.⁹ Verbal agreements to change or scrap the prenup have no legal effect. Even if both spouses agree over dinner to ignore it, nothing has changed until a signed writing exists. Keep any amendment or revocation with the original prenup, in a safe deposit box or with your attorney.

If the Marriage Turns Out to Be Void

If a court later declares the marriage void — for example, because one spouse was already married or the parties are too closely related — the prenup does not automatically spring into full force. An agreement that would otherwise have been a premarital agreement is enforceable only to the extent necessary to avoid an inequitable result, with the court choosing which provisions to apply.¹⁰

1
Justia. Indiana Code Title 31, Article 11, Chapter 3 – Uniform Premarital Agreement Act
2
Indiana General Assembly. Indiana Code 31-15-7-5 – Presumption for Equal Division of Marital Property
3
Indiana General Assembly. Indiana Code 31-11-3-5 – Content; Child Support Unaffected
4
Indiana General Assembly. Indiana Code 31-11-3-3 – Property Defined
5
Indiana General Assembly. Indiana Code 31-11-3-4 – Agreement Must Be in Writing; Consideration Not Required
6
Indiana General Assembly. Indiana Code 31-11-3-8 – Enforceability of Agreement
7
Indiana General Assembly. Indiana Code 29-1-3-6 – Waiver of Right
8
Indiana General Assembly. Indiana Code 29-1-2-13 – Waiver; Intestate Share
9
Indiana General Assembly. Indiana Code 31-11-3-7 – Amendment or Revocation Must Be in Writing; Consideration Not Required
10
Indiana General Assembly. Indiana Code 31-11-3-9 – Effect of Void Marriage