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High-Net-Worth Prenups in Florida: Protecting a Business, Trust & Investments

By Nadia Pazos, Family Law Attorney, Pazos Law Group · Updated  ·  ← All blog posts

When a marriage joins substantial or complex wealth, a prenuptial agreement is less about planning for the worst than about keeping carefully built assets clearly defined. Here is how a high-net-worth Florida prenup is structured — and why the drafting fee is trivial next to what it protects.

Quick Answer

Governing authority: Fla. Stat. § 61.079(3) (the writing-and-signature formality); Fla. Stat. § 61.079(7)(a) (the grounds for setting an agreement aside).

A high-net-worth Florida prenuptial agreement, executed under Fla. Stat. § 61.079, can designate a closely held business and its future growth as separate property, keep an anticipated inheritance and trust distributions non-marital, address equity compensation and deferred comp, coordinate with an existing estate plan, allocate multi-state and international holdings, and select governing law. The agreement is typically drafted in concert with the client’s wealth advisors, corporate counsel, and CPA, and handled with discretion. The point is precision and privacy, not cost-cutting.

Which Florida Statute Governs Prenuptial Agreements? (§ 61.079, Uniform Premarital Agreement Act)

Florida prenuptial agreements are governed by Fla. Stat. § 61.079(3) and the rest of the Uniform Premarital Agreement Act. Every proposition below is tied to the pinpoint subsection that supports it. Links go to the official text published by the Florida Legislature.

  • § 61.079(1) — adopts the Uniform Premarital Agreement Act and applies it to proceedings under the Florida Family Law Rules of Procedure.
  • § 61.079(2)(a) — defines a premarital agreement as one between prospective spouses made in contemplation of marriage and effective upon marriage.
  • § 61.079(3) — requires the agreement to be in writing and signed by both parties, and makes it enforceable without consideration other than the marriage itself.
  • § 61.079(4)(a)1.–8. — lists the permitted subjects, including property rights, management and disposition of property, wills and trusts, life insurance death benefits, and choice of law.
  • § 61.079(4)(a)4. — expressly permits the establishment, modification, waiver, or elimination of spousal support.
  • § 61.079(4)(b) — provides that a child’s right to support may not be adversely affected by a premarital agreement.
  • § 61.079(5) — makes the agreement effective upon marriage.
  • § 61.079(6) — allows amendment, revocation, or abandonment after marriage only by a written agreement signed by the parties.
  • § 61.079(7)(a)1. — ground to set aside: the party did not execute the agreement voluntarily.
  • § 61.079(7)(a)2. — ground to set aside: fraud, duress, coercion, or overreaching.
  • § 61.079(7)(a)3. — ground to set aside: unconscionable when executed, combined with the absence of fair and reasonable disclosure, no written waiver of disclosure, and no adequate knowledge of the other party’s finances.
  • § 61.079(7)(b) — allows a court to order support notwithstanding a waiver where the waiver would make a party eligible for public assistance.
  • § 61.079(7)(c) — makes unconscionability a question for the court to decide as a matter of law.
  • § 61.079(8) — limits enforcement where the marriage is determined to be void.
  • § 61.079(9) — tolls the statute of limitations on claims under the agreement during the marriage, while preserving laches and estoppel.
  • § 61.079(10) — confirms the section does not alter the formalities of spousal agreements under §§ 732.701–732.702.
  • § 61.075(6)(b) — makes assets and liabilities excluded by a valid written agreement nonmarital and therefore outside equitable distribution.
  • § 61.08(1)(a) — identifies the forms of alimony an agreement can waive or modify.
  • § 61.30(1)(a) — the child support guidelines remain presumptive regardless of what the agreement says.
  • § 61.16 — governs attorney’s fees in litigation over the agreement.
  • Casto v. Casto, 508 So. 2d 330 (Fla. 1987) — the Florida Supreme Court decision on setting aside marital agreements.
  • § 61.021 — requires 6 months of Florida residency before the dissolution in which the agreement is enforced.
  • § 61.052 — supplies the no-fault ground for the proceeding in which the agreement is applied.
  • § 61.19 — bars entry of the final judgment incorporating the agreement until at least 20 days after filing, absent a showing that the delay would cause injustice.
  • § 61.13(2)(c)1. — time-sharing is fixed by statute and by the child’s best interests; a premarital agreement cannot bind it.
  • § 61.14 — support terms the agreement leaves open remain subject to modification under this section.

Source: Florida Legislature, 2025 Florida Statutes. Fla. Stat. ch. 61 Fla. Stat. ch. 61

“A premarital agreement must be in writing and signed by both parties. It is enforceable without consideration other than the marriage itself.” — Fla. Stat. § 61.079(3)
“An issue of unconscionability of a premarital agreement shall be decided by the court as a matter of law.” — Fla. Stat. § 61.079(7)(c)
“The right of a child to support may not be adversely affected by a premarital agreement.” — Fla. Stat. § 61.079(4)(b)

Answers to the Questions the Statute Actually Decides

Does a Florida prenup have to be notarized under § 61.079(3)?

The statute requires only that the agreement be in writing and signed by both parties. It does not require notarization or witnesses, and it expressly makes the agreement enforceable without consideration other than the marriage itself. Notarization is nevertheless routine practice because it makes execution far easier to prove later.

What can invalidate a Florida prenuptial agreement?

§ 61.079(7)(a) supplies three grounds, and the burden is on the party attacking the agreement: involuntary execution; fraud, duress, coercion, or overreaching; or unconscionability at execution combined with the absence of fair and reasonable financial disclosure, no written waiver of disclosure, and no adequate independent knowledge of the other party’s finances.

Can a prenup waive child support?

No. § 61.079(4)(b) provides that a child’s right to support may not be adversely affected by a premarital agreement. Child support is calculated under the § 61.30(1)(a) guidelines regardless of what the parties agreed before marriage.

Who decides whether a prenup is unconscionable?

The judge, and as a matter of law — that is the express command of § 61.079(7)(c). Unconscionability alone is also not enough; it must be paired with the disclosure failures listed in § 61.079(7)(a)3.

Statutory authority checked against the 2025 Florida Statutes on 6 August 2026.

For couples with significant means, the questions a prenup answers are not hypothetical — they are the difference between a private, orderly outcome and a public, contested valuation years later. Florida’s § 61.079 gives sophisticated couples the tools to settle these questions in advance. Below are the issues that most often drive a high-net-worth Florida prenup.

Protecting a Closely Held Business

A business interest is frequently the most valuable — and most complex — asset in a high-net-worth marriage. Without an agreement, the appreciation of a business during the marriage, and sometimes the enterprise itself, can become subject to a marital claim, triggering a contested valuation that pits forensic accountants against each other. A prenup can define the business and its growth as separate property, address the treatment of retained earnings and reinvested profits, and avoid handing a co-founder’s spouse leverage over the company. This is often coordinated with buy-sell agreements and corporate counsel.

Inheritance, Trusts & Family Wealth

Inheritances and trust interests are generally non-marital in Florida, but that protection can erode if assets are commingled or if trust distributions are used to acquire marital property. A prenup can state clearly that an anticipated inheritance, existing trust interests, and their distributions remain separate — a priority for families passing wealth across generations or protecting assets for children from a prior relationship.

Equity Compensation & Investment Portfolios

Executives and founders often hold RSUs, stock options, carried interest, and deferred compensation whose value and vesting straddle the marriage. These require careful drafting to classify what is separate versus marital and how future vesting is treated. Investment portfolios, private equity and fund positions, and real estate holdings are addressed the same way.

Multi-State & International Assets

South Florida’s international community frequently brings assets and family interests in other states and countries. A prenup can classify those holdings as separate property and select the governing law for the agreement, which brings welcome certainty when a portfolio crosses borders.

Coordination With Your Estate Plan

A high-net-worth prenup does not live in isolation. It is drafted to work alongside your wills, trusts, and business agreements so the whole plan is consistent. That coordination — among family-law counsel, your estate-planning attorney, and your CPA — is part of what distinguishes a sophisticated agreement from a form.

A Note on Who Prenups Are For

High-net-worth couples benefit enormously from a prenup, but they are not the only ones who should consider one. A prenup is a planning tool for anyone bringing a business, real estate, savings, debt, or an expected inheritance into a marriage, or who simply wants certainty about spousal support. If you are wondering whether your situation calls for one, our guide on whether you need a prenup in Florida walks through the common scenarios.

Frequently Asked Questions

How does a prenup protect a business in Florida?

A Florida prenup can designate a business interest you own before marriage as separate property and specify how any increase in its value during the marriage is treated. That prevents your spouse from acquiring a marital claim to the company and avoids a contested business valuation in a later divorce.

Can a prenup protect an inheritance or trust?

Yes. Inheritances and trust interests are generally non-marital in Florida, but they can lose that protection if commingled. A prenup can state clearly that an anticipated inheritance, existing trust interests, and their distributions remain separate property.

We hold assets in other states and countries — can a prenup address that?

Yes. A Florida prenup can classify out-of-state and international holdings as separate property and select the governing law for the agreement, which is valuable when a portfolio spans multiple jurisdictions.

Are prenups only worthwhile for wealthy couples?

No. While high-net-worth couples benefit significantly, a prenup is useful for anyone bringing a business, real estate, savings, debt, or an expected inheritance into a marriage, or who wants certainty about spousal support. It is a planning tool, not only a tool for the wealthy.

Speak With a Florida Prenuptial Agreement Attorney

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This article is general legal information about Florida law and is not legal advice. Whether a prenuptial or postnuptial agreement is enforceable depends on the specific facts, the parties’ disclosures, and the circumstances of signing. Reading this content does not create an attorney-client relationship with Pazos Law Group. Florida law changes over time; please consult a licensed Florida attorney about your situation.