Prenup vs Postnup: Which One Do You Actually Need?

The Difference That Actually Matters

Start with what does not distinguish them, because it clears away most of what gets written about this. A prenuptial agreement and a postnuptial agreement can settle the same subjects. Property brought in and property acquired, debts, alimony, what happens to a business, and what each spouse can claim from the other's estate at death. The list is the same list.

One thing separates them and it comes from the probate code rather than the marriage statutes. Where the agreement waives a spouse's rights at death, Florida requires each spouse to make fair disclosure of their estate to the other if the agreement is executed after marriage, and requires no disclosure at all if it is executed before marriage.

Sit with that for a second, because almost everybody has it backwards. The instinct is that the document signed in the weeks before a wedding, with the venue booked and the families arriving, is the one a court would look at hardest. Florida takes the other view. Before the marriage you are two people who can still walk away, and after it you are not, so the later agreement has to rest on an honest picture of what each side is giving up.

The practical translation is short. The prenup is the lighter lift. The postnup asks for a real financial disclosure on both sides, which is more work, more time, and the reason the agreement holds.

Prenup and Postnup, Side by Side

Two rows deserve a sentence. Florida does not require extra consideration for either agreement, so nothing has to be paid or promised to make the waiver valid beyond signing it. And the list of waivable rights is identical, which is the answer to the most common worry, that being already married has cost you options. It has not.

Which One You Need Is Usually the Calendar

For most couples this is not a strategic choice.

Not yet married. Sign the prenup, and not only because it is available. It needs no disclosure, it is signed while both people can still walk away, and nobody is ever going to argue later that pressure inside a marriage produced it. See Florida prenuptial agreements and how to get one.

Already married. The postnup is the version available to you and it is a real instrument rather than a consolation prize. It is the ordinary answer for a couple who never signed anything, for a couple whose circumstances changed after an inheritance or the sale of a business, and for a couple who moved to Florida and discovered that the state has its own rules about spousal claims. See Florida postnuptial agreements.

A second marriage with children on both sides. This is where the agreement is doing the most work, whichever one it is, because two wills that each protect their own children do not stop the survivor from electing against the other's estate. The agreement is the only document that reaches that. See prenups in a second marriage and the elective share.

If You Signed One in Another State

Two questions, and people worry about the wrong one.

The formalities question is usually fine. Florida requires the waiving spouse to sign before two subscribing witnesses, and the statute applies that requirement to instruments signed by Florida residents. A couple who signed in Ohio while living in Ohio is not caught by it, so an old agreement is generally not void here for missing something Florida would have wanted.

The wording question is the real one, and it cuts both ways. Florida provides that unless the waiver says otherwise, a waiver of "all rights," or equivalent language, in the other spouse's property or estate is a waiver of the elective share. So an agreement that never uses the words elective share can still have waived it, and an agreement that carefully lists equitable distribution and alimony and stops there may not have. Reading the clause is the only way to know. What else changes when you move to Florida with a plan covers the rest of the review.

What Actually Breaks These Agreements

Not the formalities, in my experience. Ambiguity.

A Florida appellate court decided a case in 2006 that is worth knowing before either spouse signs anything. A widow filed her election to take the elective share and her husband's children objected, pointing at a prenuptial agreement that waived her rights to his separate property and never used the phrase elective share. She argued the paragraphs only described what the couple intended for their separate property at death. The court treated the agreement as ambiguous, which meant the trial judge was allowed to hear her testify about what she had meant when she signed it years earlier, and the agreement was still held to operate as a waiver. She lost the election.

Read what that case actually cost. Not the agreement's validity, which nobody contested. It cost a hearing, an appeal, and a family fight, all because a clause could be read two ways. Every hour spent on clear words at the drafting table is bought back many times over.

What Each One Costs

Both are flat fees quoted at the consult rather than posted, and the reason is honest. The price turns on what has to be valued and disclosed, on whether a business or a trust interest is involved, and on how far apart the two sides start. A postnuptial agreement generally involves more than a prenuptial one, because the disclosure Florida requires after marriage is real work rather than a schedule attached to a form.

Where the agreement is part of a wider plan, those prices are posted. A will-based plan is $1,200 for an individual and $1,950 for a couple, and a trust-based plan is $3,200 and $4,500. Posted fees are honored for at least 90 days from September 2026, and government charges are additional and passed through at cost. More on what a Florida prenup costs.

Frequently Asked Questions

Common Situations

The couple who ran out of time. An engaged couple meant to sign a prenup and the wedding arrived first. They assume the window closed. It did not. The postnup does the same work, and the disclosure it now requires turns out to be the conversation they had been avoiding anyway.

The inheritance that changed the picture. A wife inherits a family property eight years into the marriage and wants it to stay with her own children. Nothing signed before the wedding contemplated it, because it did not exist. A postnuptial agreement is the instrument that reaches it, and the disclosure requirement is satisfied by the very thing prompting the agreement.

The agreement that covered the divorce. A couple signed a detailed prenup in another state that waives equitable distribution and alimony with great care and says nothing about a Florida death. It would perform exactly as designed in a divorce. Whether it waived the elective share depends on whether any clause reaches all rights in the other spouse's property, which is a question about that document's words rather than a question anyone can answer from across a desk.

Sources of Law

• Waiver of spousal rights: Fla. Stat. §732.702(1) (the elective share, intestate share, pretermitted share, homestead, exempt property, family allowance, a community-property claim under §§732.216 to 732.228 and preference in appointment as personal representative "may be waived, wholly or partly, before or after marriage, by a written contract, agreement, or waiver, signed by the waiving party in the presence of two subscribing witnesses"; the witness requirement applies "only to contracts, agreements, or waivers signed by Florida residents after the effective date of this law"; and unless the waiver provides to the contrary, a waiver of "all rights," or equivalent language, in the property or estate of a present or prospective spouse is a waiver of all rights to the elective share). §732.702(2) (fair disclosure of each spouse's estate required where the instrument is executed after marriage, and "[n]o disclosure shall be required for an agreement, contract, or waiver executed before marriage"). §732.702(3) (no consideration beyond execution is necessary).
• Premarital agreements generally: Fla. Stat. §61.079, Florida's Uniform Premarital Agreement Act, including §61.079(3) (writing, signed by both parties, enforceable without consideration) and §61.079(10) (the act does not alter the formalities required for a spousal agreement under the probate code).
• Weisfeld-Ladd v. Estate of Ladd, 920 So. 2d 1148, 1149-50 (Fla. 3d DCA 2006) (prenuptial agreement that never referred to an elective share held to operate as a waiver of it under the "equivalent language" clause of §732.702(1); the agreement was treated as ambiguous and parol evidence of the wife's intent was admitted). Opinion read in full. (Statutes and opinion retrieved 2026-09-09.)
• Elective share: Fla. Stat. §732.2065 (30 percent of the elective estate) and §732.2035 (composition of the elective estate). Homestead devise restriction: Fla. Const. art. X, §4(c); Fla. Stat. §732.401.

The Version of This Question I Am Actually Asked

In 14 years of law practice, nobody has walked in asking me to compare two instruments. They walk in asking whether they missed their chance.

I have a few take-home points.

The first is that the question arrives as anxiety about timing and the timing is rarely the problem. A couple who did not sign before the wedding has the postnup, which does the same work on the same list of rights. What I have to tell them is that it asks for more, because Florida wants each spouse to disclose their estate to the other once the marriage exists, and that requirement is the reason the document will hold rather than an obstacle to it.

The second is that people expect the disclosure rule to run the other way, and I understand why. The prenup is signed under wedding pressure and the postnup is signed on an ordinary weekday, so the prenup looks like the suspect one. Florida decided that before the marriage each person can still walk away, which is protection enough, and afterwards they cannot.

The third is where I see the actual money lost, and it is not in choosing wrong between the two. It is in a clause that could be read two ways, litigated after somebody has died and cannot explain what they meant. I keep coming back to a 2006 case where a court found a prenuptial clause ambiguous, let the surviving wife testify about her own intent, and still held she had waived her election. She was heard and she lost anyway.

Practice pointer. Whichever document it is, name the Florida rights in the waiver clause and then add the catch-all rather than relying on it. The statute treats a waiver of all rights as reaching the elective share, and a clause that does both is the one nobody argues about ten years later.

Avoid letting one lawyer paper an agreement for both spouses. Nothing in the statute forbids it, and it hands the spouse who gave something up the most sympathetic version of the argument that the signature was not informed.

An honest limit belongs here. Whether a particular clause waives a particular right is a question about words on a page, and two agreements that read alike across a desk can come out differently once a court is construing them. Nobody should be told the answer to that before somebody has read the document.

Kevin D. Klagge, Esq., admitted in Florida since 2012. General information rather than advice on your situation.

Updated on September 9, 2026. Reviewed by Kevin D. Klagge, Esq., Fla. Bar No. 99502. Attorney Kevin Klagge represents families, businesses, and international clients in estate and tax planning, business structuring, and international law, with a focus on Florida legal tools. He litigates estate and business issues in court. General information about Florida law, not legal advice, and no attorney-client relationship is created. Do not send confidential information until we have agreed to represent you.