A prenuptial agreement waiving everything you would otherwise receive is sitting in your divorce file — and your spouse’s lawyer treats it as the end of the conversation. It is not. Florida enforces prenups, but it enforces them under a statute with specific, provable defenses, and agreements fail in court every year for reasons that were baked in the day they were signed. Whether a challenge is worth mounting is a facts-and-evidence question — one worth an experienced answer before any settlement position is taken. The Law Office of John Vernon Moore, P.A. brings over 89 years of combined experience to both attacking and defending marital agreements in Brevard County courts.
The Legal Framework: The UPAA and Its Defenses
Florida adopted the Uniform Premarital Agreement Act (§ 61.079) for agreements signed after 2007 (earlier agreements follow closely related case law). A prenup is unenforceable against a party who proves either: (1) they did not sign voluntarily — the product of fraud, duress, coercion, or overreaching; or (2) the agreement was unconscionable when signed AND the challenging party was not given fair and reasonable financial disclosure, did not waive disclosure in writing, and did not otherwise have adequate knowledge of the other party’s finances. Read that structure carefully: a merely one-sided deal, standing alone, survives — Florida lets people make bad bargains. What kills agreements is unfairness plus concealment, or a signature that was never freely given.
Attack One: The Signing Was Not Voluntary
Voluntariness challenges live in the circumstances of execution. The recurring fact patterns that persuade courts: the agreement presented days — or hours — before the wedding, with guests arriving and deposits paid, framed as sign-or-cancel; a spouse who never had counsel, was actively discouraged from getting counsel, or was handed the document at the signing table; language barriers or sophistication gaps exploited rather than accommodated; and threats beyond the wedding itself — immigration status, pregnancy, financial dependency. No single fact is automatically fatal (courts have enforced eve-of-wedding prenups), but the facts compound: last-minute presentation plus no counsel plus vast sophistication disparity tells a coercion story a judge can act on. Evidence wins these: emails and texts around the signing, drafts showing when terms appeared, witnesses to the pressure, and the timeline reconstructed precisely.
Attack Two: Unconscionability Plus Concealment
The second path requires both prongs. Unconscionability is measured at signing — an agreement leaving one spouse with essentially nothing after a long marriage while the other keeps millions is the archetype. Disclosure failure is where discovery does its work: What schedule of assets was attached? Was it complete and honestly valued? A disclosure that omitted the business, undervalued the real estate, or ignored the trusts is not fair and reasonable disclosure — and written waivers of disclosure are examined for the same voluntariness defects as the agreement itself. Note what does not work: hindsight. An agreement fair in 2010 that looks stingy after one spouse’s fortune grew is generally still enforceable — the statute’s one forward-looking mercy is alimony waivers that would leave a spouse on public assistance, which courts may disregard to that extent.
Attacks Three Through Five: The Technical Failures
Beyond the statute’s headline defenses, agreements fall to quieter defects. Execution failures: Florida requires prenups to be in writing and signed; formalities botched are agreements exposed. Abandonment and amendment: conduct during the marriage — retitling protected assets jointly, written amendments, revocations — can modify or abandon the agreement’s protections, deliberately or accidentally (the commingling doctrines operate alongside contract analysis). Scope limits: whatever the document says, provisions purporting to fix child support or timesharing are void — children’s issues belong to the court at the time of the case — and provisions promoting divorce or otherwise violating public policy fail. Sometimes the winning move is not voiding the agreement but shrinking it: enforcing the property terms while defeating an overreaching alimony waiver, or excluding assets the agreement never validly captured. With over 89 years of combined experience, our team litigates these fights from both directions — which is precisely why our drafting practice produces agreements that survive them.
The Strategic Calculus
Challenging a prenup is litigation within litigation — it adds cost, time, and uncertainty, and it should be undertaken on evidence, not indignation. The honest assessment weighs: the strength of the execution-defect and disclosure evidence; the delta between the agreement’s outcome and Florida’s default rules (a challenge worth $40,000 is different from one worth $2 million); the burden of proof, which sits on the challenger; and settlement leverage — a credible challenge often produces a negotiated improvement without a ruling. The same analysis, mirrored, serves clients defending agreements: shore up the record, prove the disclosure, and price the risk realistically.
I signed three days before the wedding. Is the prenup automatically invalid?
Not automatically — timing is one factor in the voluntariness analysis, not a rule. Combined with absent counsel, missing disclosure, or documented pressure, it becomes a serious challenge. The surrounding evidence decides it.
I never saw his real finances before signing. Does that void the agreement?
It opens the second statutory door — but you must also show the agreement was unconscionable when signed, and that you neither waived disclosure in writing nor independently knew the finances. Discovery into what was disclosed versus what existed is where these cases are won.
The prenup says I get no alimony ever. Is that enforceable?
Alimony waivers are generally enforceable in Florida — with one statutory exception: if enforcement would leave you eligible for public assistance, a court may order support notwithstanding the waiver. And the waiver falls with the agreement if voluntariness or disclosure attacks succeed.
How long does a prenup challenge take, and is it worth it?
It typically rides inside the divorce — adding months and focused discovery rather than years. Worth is arithmetic: the evidence, multiplied by the dollars between the agreement and the default law. That calculation is exactly what an initial case review should give you, in numbers.
Signed Is Not Always Settled
Prenups are presumptively enforceable — and provably breakable on the right facts. The Law Office of John Vernon Moore, P.A. evaluates, attacks, and defends marital agreements throughout Melbourne, Palm Bay, Viera, and Titusville. Call (321) 529-7777 or schedule a consultation before conceding anything.