Picture a couple who signs a prenup two years before their wedding. Everything seems fine. Then, when the marriage falls apart a decade later, a judge throws the whole thing out. Why? One partner never handed over a full list of assets, and the paperwork got signed the night before the ceremony. That’s it. All that planning, gone over a couple of procedural missteps. A prenup is only as strong as the way it was created, and here we’ll walk through exactly what Florida courts look for and the specific defects that get an agreement tossed in divorce court.
Florida Prenup Requirements Under the Law
Florida follows the Florida Uniform Premarital Agreement Act, found at Fla. Stat. § 61.079, which governs every prenup signed on or after October 1, 2007. The baseline rules are pretty simple. The agreement has to be in writing, it has to be signed by both people, and it only takes effect once the couple actually marries. Here’s a common misconception worth clearing up: notarization and witnesses are not strictly required under the statute. That said, we strongly recommend both, because they help prove the agreement was signed voluntarily if someone challenges it later. And one thing that’s never up for debate — an oral prenup is worthless in Florida. If it isn’t written down, it doesn’t exist.
Full Financial Disclosure Comes First
If there’s one issue that gets litigated more than any other, it’s financial disclosure. Each party has to give a fair and reasonable picture of their assets, debts, income, and financial obligations before signing. In practice, that usually means financial affidavits, schedules of assets attached as exhibits, and sometimes tax returns. The point is that both people know what they’re walking away from before they agree to anything.
Hiding the ball is where prenups fall apart. A spouse who quietly leaves a business interest, an offshore account, or an expected inheritance off the list is handing the other side a reason to invalidate the whole agreement. There is an exception — a party can waive disclosure in writing. But that waiver only counts if it was made voluntarily and with full understanding of what’s being given up.
Voluntary Signing and Separate Lawyers
What “Voluntary” Means to a Court
Voluntary execution means signing free from pressure, with enough time to actually read and think about the terms, and with a real understanding of what the agreement says. The biggest timing red flag judges look for is a prenup dropped on someone days or hours before the wedding. Courts weigh things like who drafted the document, when it got presented, and whether the signing party understood English or had translation available. That last point matters a lot for bilingual South Florida couples, where one spouse may be reading terms in a second language.
Why Each Side Needs Its Own Attorney
Florida doesn’t legally require each person to have their own lawyer. But the absence of independent legal counsel is one of the strongest arguments raised when a prenup gets challenged. When both people have their own attorney, it shows fairness and informed consent, and it makes the agreement much harder to attack. Keep in mind that one attorney can’t ethically represent both future spouses. Their interests are opposed, so they each need their own advocate.
Fraud, Duress, and Undue Influence
This is where prenups get voided. Fraud and duress cover things like misrepresenting finances, forging documents, or threatening to call off the wedding under circumstances that leave the other person no real choice. Coercion and undue influence usually involve a power imbalance — think of a pregnant fiancée with no income of her own, or an immigrant spouse who depends on the marriage for legal status. Those situations give a challenging spouse serious leverage.
Courts do draw a line, though. Ordinary premarital pressure — nerves, a pushy partner, a looming wedding date — doesn’t automatically void an agreement. Legally significant duress does. The difference comes down to whether the person truly had a choice. And the burden of proof sits with the spouse trying to break the agreement, not the one defending it.
When an Agreement Is Unconscionable
An unconscionable agreement is one so grossly one-sided it shocks the conscience. Under FUPAA, there’s a two-part test. The agreement has to have been unconscionable when it was signed, and the challenging spouse has to show they didn’t get fair disclosure, didn’t waive it, and couldn’t reasonably have known the other person’s finances. Here’s the part people misunderstand: an unfair or lopsided deal, by itself, isn’t enough. Florida courts will enforce a bad bargain if it was made knowingly and voluntarily. Signing away most of your rights to marital property is enforceable. Signing under deception, with no idea what your spouse actually owned, is not.
Waiving Support and Dividing Property
Alimony Waiver Rules
A waiver of spousal support is generally enforceable in Florida, with one important catch. If enforcing that waiver would leave a spouse eligible for public assistance at the time of divorce, a court can order support anyway, prenup or not. It’s also worth knowing that temporary alimony during the divorce itself generally can’t be waived.
Marital vs. Separate Property
Prenups let couples override Florida’s default equitable distribution of assets by deciding in advance what counts as marital versus separate property. That’s how people protect businesses, inheritances, and premarital savings. But there’s a hard limit. A prenup can’t predetermine child support or custody. Those always stay tied to the child’s best interests and require court approval, no matter what the agreement says.
Already Married? Consider a Postnup
Missed the window before the wedding? A postnuptial agreement does the same job and covers the same ground. Postnups actually face similar, and arguably stricter, scrutiny, because once you’re married you owe each other fiduciary duties. That makes full disclosure and separate counsel even more important. A postnup can also amend or revoke an existing prenup, as long as that change is put in writing.
Protecting Your Agreement Before It’s Tested
The formula for an enforceable prenup isn’t complicated: a written agreement, full disclosure, voluntary signing, fair terms, enough time to review, and separate attorneys. Get those right and the agreement holds up. Most voided prenups don’t fail on their substance — they fail on process. That’s true whether you’re the spouse trying to enforce an agreement or the one questioning whether it should stand. Our family law team at Reynoso Erickson Trial Law works with couples throughout North Miami and Miami-Dade County on prenups, postnups, and the disputes that follow, with service in both English and Spanish.