Key Biscayne Prenuptial Agreement Attorney

By Nadia Pazos, Family Law Attorney, Pazos Law Group · Updated July 2026

Quick Answer

Are prenuptial agreements enforceable in Key Biscayne, Florida?

Yes. A prenuptial agreement signed in Key Biscayne is enforceable under Fla. Stat. § 61.079, Florida’s Uniform Premarital Agreement Act. Section 61.079(3) asks only that the agreement be “in writing and signed by both parties,” and § 61.079(5) provides that it “becomes effective upon marriage of the parties.” A Miami-Dade County judge will enforce it unless the spouse resisting it carries the burden set by § 61.079(7)(a). What varies from couple to couple in Key Biscayne is the subject matter — here, most often island real estate and assets held abroad. Section 61.079(2)(b) defines property broadly enough to reach all of it.

Key Biscayne is a small, high-net-worth island community with a strongly international population and some of Miami-Dade’s most valuable real estate. A prenuptial agreement lets island couples define what stays separate before those assets combine.

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Prenuptial Agreements on Key Biscayne

Life on the Key often means significant real estate — an oceanfront condo or a single-family home — combined with international ties, foreign accounts, and family wealth from abroad. Florida’s prenuptial agreement law lets these couples set clear boundaries around separate property before the marriage begins.

Pazos Law Group drafts and reviews prenuptial agreements for Key Biscayne residents in English and Spanish, with particular care for high-value real estate and cross-border assets.

Why Key Biscayne Couples Use Prenuptial Agreements

Island couples use prenups for reasons tied to value and mobility. A high-value residence bought before the engagement is worth keeping clearly separate from marital appreciation. International residents often hold assets in more than one country and want them identified before commingling. And families that expect to move between jurisdictions want certainty that does not depend on where a future case is heard.

Because a Florida court would otherwise apply equitable distribution — a framework the marital asset division calculator illustrates — a prenup gives island couples control over those outcomes.

High-Net-Worth & Complex-Asset Prenups in Key Biscayne

On Key Biscayne, complex wealth tends to arrive in a particular combination: a waterfront residence or oceanfront condominium, a professional practice run from the mainland, retirement and investment portfolios built over a career, and family or business ties that reach beyond the United States. A high-net-worth prenup does more than list those assets — it characterizes each one as separate property and describes how it should be traced if it is later refinanced, sold, or rolled into a new holding. Under Fla. Stat. § 61.075, the active appreciation of a separate asset — growth driven by a spouse’s own effort during the marriage — can be pulled into the marital estate, so the agreement fixes that character now rather than leaving it to a valuation fight later.

For an island physician, attorney, or advisor, that means addressing how a practice’s growth and a portfolio’s returns are treated. For an international family, it means identifying foreign accounts and property before they commingle and choosing which jurisdiction’s law governs. Because enforceability under Fla. Stat. § 61.079 turns on full disclosure, independent counsel, and unhurried timing, we build those safeguards in from the first draft — and coordinate with your CPA, financial advisor, and, where needed, a forensic accountant. Learn more about our high-net-worth prenuptial agreement practice.

Are Prenuptial Agreements Enforceable in Florida?

Yes. Enforceability in Key Biscayne turns on a single section of the Florida Statutes and on nothing in the local rules of the Eleventh Judicial Circuit. Formation is straightforward. Under § 61.079(3) the agreement “must be in writing and signed by both parties” and needs no consideration “other than the marriage itself.” Under § 61.079(5) it “becomes effective upon marriage of the parties,” so the document sits dormant between signing and the ceremony.

Who Has the Burden of Proof Under § 61.079(7)(a)?

The party attacking the agreement bears it. Section 61.079(7)(a) makes an agreement unenforceable where “the party against whom enforcement is sought proves” any one of three grounds:

Involuntary execution. Section 61.079(7)(a)1. asks whether the party “did not execute the agreement voluntarily.”
Fraud, duress, coercion, or overreaching. Section 61.079(7)(a)2. voids an agreement that “was the product of fraud, duress, coercion, or overreaching.”
Unconscionability plus a disclosure failure. Section 61.079(7)(a)3. requires that the agreement “was unconscionable when it was executed” and that the challenger received no “fair and reasonable disclosure,” signed no written waiver of disclosure, and had no adequate knowledge of the other party’s property or financial obligations.

Note the structure of the third ground: subparagraphs a., b., and c. of § 61.079(7)(a)3. are joined by “and.” A challenger who received a fair disclosure fails the test even if the bargain looks lopsided. Section 61.079(7)(c) assigns the unconscionability issue to the court “as a matter of law,” which is why the analysis looks to the circumstances at execution rather than to how the marriage turned out.

The statute keeps one safety valve: § 61.079(7)(b) allows a court to require support despite the agreement where the waiver would leave a spouse eligible for public assistance. Section 61.079(8) covers the unusual case of a void marriage: the agreement is then enforceable “only to the extent necessary to avoid an inequitable result.”

A Key Biscayne couple already married is outside § 61.079 entirely. Section 61.079(2)(a) limits the Act to agreements made in contemplation of marriage; postnuptial agreements are governed by Casto v. Casto, 508 So. 2d 330 (Fla. 1987), which permits a court to set an agreement aside for fraud, duress, or overreaching. A Key Biscayne couple can read § 61.079 for themselves at leg.state.fl.us, where the Legislature publishes the current text.

Does a Florida Prenup Have to Be Notarized?

No. Section 61.079(3) sets the entire formality requirement, and a notary is not part of it. Notarizing is common practice in Key Biscayne but legally optional. What is not optional is the form of any later change: § 61.079(6) requires a signed writing to amend, revoke, or abandon the agreement.

What a Key Biscayne Prenup Can and Cannot Cover

A Key Biscayne prenup can classify a luxury residence, foreign accounts, and pre-marital investments as separate property, direct how they pass on divorce or death, and establish or waive spousal support. It can protect a business interest and an inheritance, allocate life-insurance benefits, and choose which jurisdiction’s law governs interpretation — useful for internationally mobile couples.

It cannot set child support or a time-sharing schedule in advance. Those remain with the court under the best-interests standard of Fla. Stat. § 61.13.

What Can a Prenup Cover Under § 61.079(4)(a)?

Section 61.079(4)(a) lists eight subjects that prospective spouses “may contract with respect to.” They are, in the statute’s order:

the rights and obligations of each party in property “whenever and wherever acquired or located” (§ 61.079(4)(a)1.);
the right to buy, sell, lease, encumber, dispose of, or otherwise manage and control property (§ 61.079(4)(a)2.);
the disposition of property on separation, dissolution, or death (§ 61.079(4)(a)3.);
“the establishment, modification, waiver, or elimination of spousal support” (§ 61.079(4)(a)4.);
the making of a will, trust, or other arrangement to carry out the agreement (§ 61.079(4)(a)5.);
ownership and disposition of life insurance death benefits (§ 61.079(4)(a)6.);
the choice of law governing construction of the agreement (§ 61.079(4)(a)7.); and
“any other matter” not violating public policy or a criminal statute (§ 61.079(4)(a)8.).

A Key Biscayne couple can state that a pre-marriage apartment in another country and the account that funds it remain separate, and can choose Florida law to govern how the agreement is read. The definition in § 61.079(2)(b) covers contingent and future interests as well as present ones, and it names “income and earnings, both active and passive” explicitly. Very little of a Key Biscayne balance sheet falls outside it.

Without an agreement, the default rules apply. Fla. Stat. § 61.075 requires the court to classify property before dividing it; § 61.075(6)(b) treats assets acquired before the marriage and property acquired separately by gift or inheritance as nonmarital, while § 61.075(6)(a)1.b. pulls the enhancement in value of a nonmarital asset into the marital estate when it results from marital labor or marital funds. Kaaa v. Kaaa, 58 So. 3d 867 (Fla. 2010), addresses how passive appreciation on a nonmarital property is treated when marital funds pay down the mortgage.

Alimony can be fixed or waived outright: § 61.079(4)(a)4. covers “the establishment, modification, waiver, or elimination of spousal support,” which takes the 2023 version of § 61.08 out of the picture except for the § 61.079(7)(b) floor. One more provision is easy to miss: § 61.052(5) provides that a court “may enforce an antenuptial agreement to arbitrate a dispute in accordance with the law and tradition chosen by the parties.”

What a Prenup Cannot Waive (§ 61.079(4)(b))

Everything in § 61.079(4)(a) is subject to the next paragraph. Section 61.079(4)(b) states that “The right of a child to support may not be adversely affected by a premarital agreement.” Because the right is the child’s, the parents have nothing to trade. Support is computed under the § 61.30 guidelines from combined net income and the overnight split, and a Eleventh Judicial Circuit judge runs that calculation regardless of what the agreement says.

The same is true of the parenting schedule. Section 61.13(2)(c) has, since 1 July 2023, started the analysis from a rebuttable presumption of equal time-sharing, applied to the facts as they exist at the time of the case.

The remaining limits are narrow. Under § 61.079(4)(a)8. a term must not violate Florida public policy or a criminal statute, and under § 61.079(7)(b) a support waiver yields where it would leave a spouse on public assistance.

How Much Does a Prenup Cost in Key Biscayne, Florida?

There is no court filing fee for a prenuptial agreement. It is a private contract between two people, and it is never filed with a court unless someone later asks a judge to enforce it or set it aside. Pricing is normally a flat fee and varies by complexity rather than by hours. The low end of the range covers a short agreement between two salaried people; the high end covers business interests, valuations, trust coordination, and multi-jurisdiction assets. Each spouse should retain separate counsel in Key Biscayne, which means two engagements, and a range is the most any firm can responsibly give before reviewing the balance sheet.

Fee variation traces to three inputs: schedule length driven by § 61.079(7)(a)3.a., valuation work, and negotiation rounds. Foreign real property adds cost because the agreement should account for the law of the place where the property sits as well as Florida law.

Cost and risk move together on timing: last-minute agreements cost more to produce and are the ones most often challenged under § 61.079(7)(a)1. For comparison, a contested dissolution starts with the Miami-Dade Clerk’s dissolution of marriage filing fee of $409.00, and everything after that — valuations, depositions, hearings — is additional. A prenup is normally the cheaper of the two documents by a wide margin.

How Long Does a Divorce Take in Key Biscayne, Florida?

Residency is the first clock. Section 61.021 states that “one of the parties to the marriage must reside 6 months in the state before the filing of the petition,” and § 61.052(2) allows that residency to be corroborated by a Florida driver license, voter registration card, or identification card.

Florida sets no waiting period after filing. Where there is no minor child and the other spouse does not deny that the marriage is irretrievably broken, § 61.052(2)(a) directs the court to enter judgment once it so finds, and an uncontested Key Biscayne case can close in weeks. Where a minor child is involved or the responding spouse denies the ground, § 61.052(2)(b) lets the court continue the proceedings “for a reasonable length of time not to exceed 3 months” to allow reconciliation.

Contested Miami-Dade County cases move at the speed of mediation. Section 61.183 authorizes referral of contested issues, § 44.102 governs the court-ordered process, and § 44.405 supplies the confidentiality and privilege that make candid discussion possible. Key Biscayne is a village on a barrier island connected to the mainland by the Rickenbacker Causeway, within Miami-Dade County.

This is where a prenup pays for itself. With § 61.075 classification and § 61.08 support settled in advance, the only issues left for a Miami-Dade County judge are the ones § 61.079(4)(b) reserves to the court. For court-published guidance and approved family law forms, see flcourts.gov.

Florida Prenup Rules at a Glance

The rules a Key Biscayne couple actually needs, with the pinpoint citation for each:

Governing statute: Fla. Stat. § 61.079, which § 61.079(1) names the Uniform Premarital Agreement Act.
Form: a writing signed by both parties, enforceable without consideration beyond the marriage (§ 61.079(3)).
Notary or witnesses: not required anywhere in § 61.079(3).
Effective date: the agreement takes effect on the marriage itself (§ 61.079(5)).
Grounds to void: only the three listed in § 61.079(7)(a), proved by the party resisting enforcement.
Cannot be waived: a child’s right to support (§ 61.079(4)(b)); support is set under § 61.30 and time-sharing under § 61.13(2)(c).
Default without an agreement: equitable distribution under § 61.075 and alimony under § 61.08.
Changing it later: only by a written agreement signed by both parties (§ 61.079(6)).
Where it is filed: nowhere. A dissolution, by contrast, is filed with the Miami-Dade County Clerk in the Eleventh Judicial Circuit.

Drafting an Agreement vs. Reviewing One

Drafting and reviewing are different tasks with different risks. Drafting means building the disclosure schedule that § 61.079(7)(a)3.a. makes advisable, choosing the governing law under § 61.079(4)(a)7., and writing the support terms permitted by § 61.079(4)(a)4. Reviewing means testing a document someone else wrote against the three defenses in § 61.079(7)(a) before a signature makes them harder to raise.

How Pazos Law Group Helps Key Biscayne Couples

From Coral Gables, a short drive from the Rickenbacker Causeway, we serve Key Biscayne couples in English and Spanish with the discretion the community values. Nadia Pazos is AV Preeminent-rated and admitted in Florida and New York.

Frequently Asked Questions

Can a prenup protect my oceanfront property?

Yes. A prenup can designate a residence you owned before marriage, along with its appreciation, as separate property. That is especially valuable for high-value real estate, where growth during a marriage can otherwise create sizable marital claims.

We hold assets in several countries. Can a prenup address that?

It can. A Florida prenuptial agreement can identify foreign accounts and property as separate and include a choice-of-law provision. Because tracing international assets is harder once commingled, disclosing them clearly in the agreement matters.

Does a Key Biscayne prenup need witnesses or a notary?

No. Florida law requires only a written agreement signed by both parties. Witnesses and notarization are optional practices, not legal requirements.

We may move abroad after marrying. Is the prenup still useful?

Yes. A prenup can include a governing-law clause and can help provide continuity even if you relocate, though a court in another jurisdiction applies its own rules. Drafting with mobility in mind is advisable for international couples.

Are prenuptial agreements enforceable in Key Biscayne, Florida?

Yes. Enforceability is set by Fla. Stat. § 61.079. Section 61.079(3) requires only a writing signed by both parties, and § 61.079(5) makes it effective on marriage. A Key Biscayne court will enforce it unless the resisting spouse proves involuntary execution, fraud or duress or coercion or overreaching, or unconscionability combined with a failure of disclosure, all under § 61.079(7)(a).

How much does a prenup cost in Key Biscayne, Florida?

No clerk’s fee applies, since the agreement is never filed. Attorney fees vary by complexity and are usually quoted flat: a short Key Biscayne agreement between two salaried people sits at the low end of the range, while a business, a trust, deferred compensation, or assets held abroad move it substantially higher. Because both spouses should be separately represented, plan on two fees.

Can a Key Biscayne prenup waive child support or set a parenting schedule?

No. Section 61.079(4)(b) puts child support outside the agreement entirely, and a Eleventh Judicial Circuit judge applies the § 61.30 guidelines using both parents’ net incomes and the overnight count. Time-sharing is likewise reserved to the court under § 61.13(2)(c) and its 2023 equal time-sharing presumption.

Does a Florida prenup have to be notarized or witnessed?

No. Section 61.079(3) sets the whole formality requirement: a writing, signed by both parties. Florida imposes no notary and no witness requirement. Many couples notarize anyway to make the signatures harder to dispute. Any later amendment or revocation, however, must itself be a signed writing under § 61.079(6).

How long does a divorce take in Key Biscayne, Florida?

It depends almost entirely on whether anything is contested. Section 61.021 requires six months of Florida residence before filing, and § 61.052(1)(a) supplies the no-fault ground. There is no statutory waiting period, so an uncontested Key Biscayne case can finish in weeks; contested cases move at the pace of discovery and mediation under § 61.183 and § 44.102.

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Prenuptial Agreements for Key Biscayne Residents

On Key Biscayne, marriages often join valuable real estate with international wealth. A prenuptial agreement under Fla. Stat. § 61.079 records what stays separate and how cross-border assets are treated, so the outcome does not hinge on a future court. Pazos Law Group drafts and reviews these agreements from nearby Coral Gables in both languages.

Postnuptial Agreements in Key Biscayne

In Key Biscayne, many of these questions arrive after the wedding rather than before it. The instrument for that situation is a postnuptial agreement — the same financial planning, signed after the wedding rather than before. The assets in question are typically the same: high-net-worth residents and international couples.

A postnuptial agreement is a different legal animal. Fla. Stat. § 61.079 applies only to agreements “made in contemplation of marriage” under § 61.079(2)(a); everything signed afterward is judged by Florida common law and Casto v. Casto, 508 So. 2d 330 (Fla. 1987), which allows a court to set the agreement aside for fraud, duress, coercion, or overreaching or where it is unfair and disclosure was lacking.

A Key Biscayne postnuptial agreement can classify separate and marital property, allocate debt, address a business, and define or waive spousal support that would otherwise fall under § 61.08. What it cannot do is affect a child’s right to support — that right belongs to the child and is calculated under § 61.30 regardless of what the spouses agree.

Full guide to Florida postnuptial agreements →

Prenuptial Agreements in Nearby Communities

Fla. Stat. § 61.079 governs premarital agreements statewide, not just in one city. Nearby communities:

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Informational content, not legal advice. A prenuptial agreement’s enforceability under Fla. Stat. § 61.079 depends on the parties’ disclosures and the circumstances at execution, and the outcome in any Miami-Dade County case turns on its own facts. No attorney-client relationship is created by reading this page. Florida statutes are amended regularly; check the current text before relying on it.