A postnuptial agreement in Florida is a legally binding contract between spouses that determines how assets, debts, and alimony will be handled in the event of divorce or death. Under Florida law, postnuptial agreements are governed by general contract principles and the standards established in Casto v. Casto, 508 So.2d 330 (Fla. 1987). To be enforceable, a Florida postnup must be in writing, signed by both spouses, include full financial disclosure, and be entered into voluntarily without fraud, duress, or coercion. Florida courts begin with the presumption that these agreements are valid, but they face greater judicial scrutiny than prenuptial agreements because spouses owe each other fiduciary duties.
Key Facts: Postnuptial Agreements in Florida
| Requirement | Florida Standard |
|---|---|
| Written Form | Required under Fla. Stat. § 61.079 |
| Financial Disclosure | Full and fair disclosure mandatory |
| Independent Counsel | Recommended but not legally required |
| Consideration | Mutual promises (marriage alone insufficient) |
| Notarization | Not required but recommended |
| Witnesses | Required only for testamentary provisions (2 witnesses) |
| Filing Fee (if divorce) | $408-$409 plus $10 summons fee |
| Residency Requirement | 6 months for either spouse |
| Waiting Period | 20 days minimum after filing |
| Property Division | Equitable distribution under Fla. Stat. § 61.075 |
What Is a Postnuptial Agreement Under Florida Law
A postnuptial agreement is a contract signed after marriage that defines the financial rights and obligations of each spouse during the marriage and in the event of divorce or death. Florida recognizes postnuptial agreements as enforceable contracts when they meet specific legal requirements, including written execution, voluntary consent, and full financial transparency between spouses. Unlike prenuptial agreements governed by Fla. Stat. § 61.079 (the Uniform Premarital Agreement Act), postnuptial agreements are evaluated under common law contract principles and the two-prong test established in Casto v. Casto.
The distinction between prenuptial and postnuptial agreements matters significantly in Florida. For a prenuptial agreement, the marriage itself serves as valid consideration for the contract. For a postnuptial agreement, the marriage has already occurred, so mutual promises granting each party respective rights serve as the consideration. This difference affects how courts evaluate enforceability. Florida courts have consistently held that postnuptial agreements receive heightened scrutiny because spouses owe each other fiduciary duties that do not exist between unmarried individuals negotiating a prenup.
Common reasons couples enter into postnuptial agreements include reconciliation after infidelity (defining consequences for future breaches), significant changes in wealth (inheritance, business success, or lottery winnings), career changes (one spouse leaving work to raise children), and addressing issues that were not contemplated before marriage. According to a 2024 survey by the American Academy of Matrimonial Lawyers, 62% of family law attorneys reported an increase in postnuptial agreement requests over the past five years.
Legal Requirements for a Valid Florida Postnuptial Agreement
A postnuptial agreement in Florida must satisfy five core requirements to be enforceable: written form, signatures from both spouses, full financial disclosure, voluntary execution, and consideration. Under the framework established in Casto v. Casto, Florida courts will void agreements obtained through fraud, deceit, duress, coercion, misrepresentation, or overreaching. Additionally, courts may refuse to enforce agreements that are unconscionably unfair to one spouse at the time of execution.
Written Form and Execution
Florida law requires all postnuptial agreements to be in writing and signed by both parties. Oral agreements regarding the division of marital property or alimony are not enforceable in Florida divorce proceedings. The agreement does not need to be notarized to be valid, but notarization is strongly recommended because it provides evidence of authenticity and voluntary execution. If the postnuptial agreement contains testamentary provisions (what happens upon the death of a spouse), it must be executed with will formalities under Florida law, meaning it must be signed in the presence of two witnesses who must also sign the document.
Full Financial Disclosure
Full and fair financial disclosure is the most critical requirement for an enforceable Florida postnuptial agreement. Each spouse must provide complete information about their income, assets, and debts before signing. Under the Casto framework, when an agreement does not adequately provide for one spouse, this creates a rebuttable presumption that the agreement resulted from concealment or inadequate knowledge of the other spouse's finances. The defending spouse must then prove that full disclosure was made contemporaneous to execution.
Financial disclosure should include: current income from all sources, bank account balances, investment account statements, retirement account values, real estate holdings with estimated values, business ownership interests with valuations, outstanding debts and liabilities, and any anticipated inheritances or trust distributions. Many Florida family law attorneys recommend attaching financial schedules to the agreement as exhibits.
Voluntary Execution Without Duress
Both spouses must enter the agreement freely and voluntarily. Florida courts in 2024-2025 have increasingly scrutinized agreements for signs of coercion or rushed decisions. Presenting a postnuptial agreement during a marital crisis or immediately after discovering infidelity raises red flags about voluntariness. Courts may invalidate agreements if one spouse felt pressured to sign. Best practices include allowing adequate time for review (at least 7-14 days), providing the opportunity for independent legal counsel, and avoiding ultimatums tied to signing.
Independent Legal Representation
Although not legally required, having each spouse represented by independent legal counsel significantly strengthens enforceability. A postnuptial agreement will not be set aside solely because one or both parties were not represented by counsel. However, a spouse who signed without understanding their rights or the implications may later claim the agreement was unconscionable. Independent counsel for each party helps demonstrate that both spouses understood what they were agreeing to and that the agreement was fair.
What Can Be Included in a Florida Postnuptial Agreement
Florida postnuptial agreements can address a wide range of financial matters between spouses, including property division, debt allocation, alimony, and estate planning provisions. Parties to a postnuptial agreement may contract with respect to the rights and obligations of each party in any property of either or both of them, whenever and wherever acquired or located. The agreement can also address how property is disposed of if certain life events occur, such as divorce or death.
Property and Asset Division
A postnuptial agreement can define what constitutes separate property versus marital property, overriding Florida's default equitable distribution rules under Fla. Stat. § 61.075. For example, spouses can agree that an inheritance received during the marriage remains the separate property of the receiving spouse, or that a family business owned by one spouse before marriage will not be subject to division. The agreement can address homes, investments, retirement accounts, vehicles, jewelry, and any other assets.
Alimony and Spousal Support
Florida postnuptial agreements can set limits on alimony, waive it entirely, or create a clear formula for calculating support. For example, a postnup might specify that alimony will be $5,000 per month for a duration equal to 50% of the length of the marriage. However, courts retain discretion to override an alimony waiver in limited circumstances. Under Fla. Stat. § 61.079(4), if an alimony waiver would cause one spouse to become eligible for public assistance at the time of separation or dissolution, the court may require the other spouse to provide support necessary to avoid that eligibility. Additionally, temporary alimony during divorce proceedings cannot be waived and remains subject to court determination.
Debt Allocation
Postnuptial agreements can specify how debts incurred during the marriage will be allocated between spouses. This is particularly useful when one spouse has significant student loans, business debts, or credit card obligations. The agreement can provide that debts incurred solely by one spouse remain that spouse's responsibility, regardless of when they were incurred.
Estate Planning Provisions
A postnuptial agreement can address estate planning matters, including what happens to assets upon the death of a spouse. However, if the agreement contains testamentary provisions, it must be executed with will formalities (signed in the presence of two witnesses who also sign). Spouses can waive their elective share rights, which under Fla. Stat. § 732.201 entitle a surviving spouse to 30% of the elective estate.
What Cannot Be Included in a Florida Postnuptial Agreement
Florida law prohibits certain provisions in postnuptial agreements, and courts will not enforce terms that violate public policy or statutory protections. Understanding these limitations is essential for creating an enforceable agreement.
Child Support and Custody
By Florida statute, postnuptial agreements may not waive child support, child custody, or child visitation rights. The right of a child to support may not be adversely affected by any marital agreement under Fla. Stat. § 61.079(3). Courts determine child support based on the Florida Child Support Guidelines under Fla. Stat. § 61.30, and time-sharing arrangements are based on the best interests of the child under Fla. Stat. § 61.13. Any provisions attempting to limit or waive these rights will be struck from the agreement.
Provisions That Encourage Divorce
Florida courts will not enforce provisions that incentivize divorce or penalize a spouse for remaining in the marriage. For example, a clause providing that one spouse receives a larger share of assets only if they file for divorce within a certain time frame would likely be deemed contrary to public policy.
Criminal Activity or Illegal Terms
Any provision requiring illegal conduct or violating Florida criminal law is unenforceable. The agreement cannot include terms that are in violation of either the public policy of this state or a law imposing a criminal penalty.
How Florida Courts Evaluate Postnuptial Agreements
Florida courts apply the two-prong test from Casto v. Casto, 508 So.2d 330 (Fla. 1987) when evaluating whether to enforce a postnuptial agreement. This landmark Florida Supreme Court decision established the framework that continues to govern postnuptial agreement disputes in Florida courts today.
The Casto Two-Prong Test
Under Casto, a postnuptial agreement may be set aside or modified if the attacking spouse proves either of two grounds:
First, the agreement was obtained by fraud, deceit, duress, coercion, misrepresentation, or overreaching. This prong focuses on the circumstances surrounding execution. Evidence of threats, intimidation, or false statements about assets can invalidate the agreement.
Second, the agreement was unconscionably unfair at the time of execution, AND the defending spouse failed to make full financial disclosure. Under this prong, if the attacking spouse proves the agreement is grossly one-sided, the burden shifts to the defending spouse to demonstrate that full financial disclosure was made contemporaneous to the execution.
The Casto Facts Illustrate the Standard
In Casto, the wife received approximately $225,000 in exchange for claims against her husband's assets, which were estimated to be worth as much as $10 million. The Florida Supreme Court found this 2.25% share to be unconscionably unfair. Because the husband could not prove he made full financial disclosure, the agreement was set aside. This case demonstrates that Florida courts will not enforce postnuptial agreements that result in profoundly unfair distributions when one spouse lacked adequate financial knowledge.
Timing and Fairness Considerations
Florida courts evaluate fairness at the time of execution, not at the time of divorce. An agreement that seemed fair when signed will generally be enforced even if circumstances change dramatically. However, courts consider whether both spouses had adequate time to review the agreement, whether independent counsel was available, and whether the financial circumstances of both parties were accurately represented.
Cost of Creating a Postnuptial Agreement in Florida
The cost of a postnuptial agreement in Florida typically ranges from $2,500 to $10,000 when drafted by experienced family law attorneys, depending on complexity and whether both spouses have independent counsel. Simple agreements addressing basic property division may cost less, while complex agreements involving business valuations, multiple properties, or intricate alimony formulas cost more.
| Service | Typical Cost Range |
|---|---|
| Attorney fees (each spouse) | $1,500 - $5,000 |
| Business valuation (if needed) | $3,000 - $15,000 |
| Real estate appraisal | $300 - $600 |
| Notarization | $10 - $25 |
| Document preparation (DIY template) | $50 - $200 |
| Total (simple agreement, one attorney) | $2,000 - $4,000 |
| Total (complex agreement, both attorneys) | $5,000 - $15,000+ |
While DIY postnuptial agreement templates are available online for $50 to $200, they carry significant risks. Florida courts scrutinize postnuptial agreements more closely than prenuptial agreements, and technical errors in drafting can render an agreement unenforceable. Given that a contested divorce in Florida costs an average of $11,000 to $25,000 or more, the investment in a properly drafted postnuptial agreement often saves significant money if the marriage ends in divorce.
Steps to Create an Enforceable Postnuptial Agreement in Florida
Creating an enforceable postnuptial agreement in Florida requires careful attention to legal requirements and best practices. Following these steps maximizes the likelihood that a court will enforce your agreement if challenged.
Step 1: Complete Full Financial Disclosure
Before drafting begins, both spouses must compile complete financial information including income statements (W-2s, tax returns, pay stubs), bank account statements for all accounts, investment account statements, retirement account statements (401(k), IRA, pension), real estate deeds and estimated values, business ownership documents and valuations, vehicle titles and values, outstanding debt statements, and life insurance policies. Attach these documents as exhibits to the final agreement.
Step 2: Retain Independent Legal Counsel
Each spouse should retain their own family law attorney. While not legally required, independent representation is the strongest protection against later claims of duress or lack of understanding. The attorney should explain Florida law, review the proposed terms, and ensure the agreement protects their client's interests.
Step 3: Negotiate and Draft the Agreement
Work with counsel to negotiate fair terms that address property division, debt allocation, alimony, and any other financial matters. The agreement should clearly identify all assets and debts, specify how each will be treated in divorce, and include recitals confirming that both parties received full financial disclosure and had the opportunity to consult with independent counsel.
Step 4: Allow Adequate Review Time
Do not rush the signing process. Both spouses should have at least 7-14 days to review the final agreement with their attorneys. Rushing creates evidence of duress or pressure that courts may use to invalidate the agreement.
Step 5: Execute the Agreement Properly
Both spouses must sign the agreement. Have the signatures notarized for evidentiary purposes. If the agreement contains testamentary provisions, sign in the presence of two witnesses who also sign. Keep the original agreement in a secure location and provide copies to both spouses' attorneys.
Modifying or Revoking a Florida Postnuptial Agreement
After marriage, a postnuptial agreement may be amended, revoked, or abandoned only by a written agreement signed by both parties. Under the principles in Fla. Stat. § 61.079(5), the amended agreement, revocation, or abandonment is enforceable without additional consideration. One spouse cannot unilaterally revoke or modify a postnuptial agreement.
To modify an existing postnuptial agreement, spouses should execute a written amendment that references the original agreement, specifies which provisions are being changed, and is signed by both parties. The amendment should follow the same execution formalities as the original agreement, including notarization and witnesses for any testamentary provisions.
Postnuptial Agreements vs. Separation Agreements in Florida
A postnuptial agreement is created during an intact marriage to plan for potential future events, while a separation agreement is typically negotiated when spouses have decided to divorce and are settling the terms of their dissolution. Florida does not require legal separation before divorce, so separation agreements in Florida function as marital settlement agreements that become part of the final judgment of dissolution.
The key difference is timing and intent. A postnuptial agreement anticipates that the marriage will continue, while a separation or marital settlement agreement contemplates imminent divorce. Both types of agreements are enforceable in Florida if they meet the requirements of voluntary execution, full disclosure, and fairness.
Filing for Divorce in Florida With a Postnuptial Agreement
If your marriage ends despite having a postnuptial agreement, the agreement will be presented to the court as part of the divorce proceedings. Florida courts will generally enforce the agreement's terms unless one spouse challenges it under the Casto framework.
Basic Divorce Requirements in Florida
To file for divorce in Florida, at least one spouse must have been a Florida resident for at least 6 months immediately before filing under Fla. Stat. § 61.021. The filing fee is $408-$409 plus a $10 summons fee (as of March 2026, verify with your local clerk). Florida has a 20-day waiting period from filing to final judgment under Fla. Stat. § 61.19. Florida is a no-fault divorce state, requiring only that the marriage be irretrievably broken.
An uncontested divorce in Florida where both spouses agree on all terms (including enforcement of a postnuptial agreement) typically takes 4-6 months and costs $2,500 to $5,000 with attorney representation. A contested divorce where the postnuptial agreement is challenged can take 12-24 months and cost $11,000 to $25,000 or more.
Frequently Asked Questions
Is a postnuptial agreement enforceable in Florida?
Yes, postnuptial agreements are enforceable in Florida when they meet legal requirements established in Casto v. Casto, 508 So.2d 330 (Fla. 1987). The agreement must be in writing, signed by both spouses, based on full financial disclosure, and entered into voluntarily. Courts will not enforce agreements obtained through fraud, duress, or coercion, or agreements that are unconscionably unfair when one spouse lacked adequate financial knowledge.
Can a postnuptial agreement waive alimony in Florida?
Yes, a Florida postnuptial agreement can waive or limit alimony, but courts retain limited discretion to override waivers. Under Fla. Stat. § 61.079(4), if waiving alimony would make one spouse eligible for public assistance at divorce, the court may require support. Temporary alimony during divorce proceedings cannot be waived. Both spouses must voluntarily agree to waive alimony with full understanding of the implications.
Does a postnuptial agreement need to be notarized in Florida?
No, notarization is not legally required for a postnuptial agreement to be valid in Florida. However, notarization is strongly recommended because it provides evidence of authenticity and voluntary execution. If the agreement contains testamentary provisions (addressing what happens at death), it must be signed in the presence of two witnesses who also sign the document.
How much does a postnuptial agreement cost in Florida?
A postnuptial agreement in Florida typically costs $2,500 to $10,000 when drafted by attorneys, depending on complexity. Attorney fees range from $1,500 to $5,000 per spouse for independent representation. Additional costs may include business valuations ($3,000-$15,000) or real estate appraisals ($300-$600). DIY templates cost $50-$200 but carry significant enforceability risks.
Can a postnuptial agreement address child custody in Florida?
No, Florida law prohibits postnuptial agreements from waiving or limiting child support, custody, or visitation rights. Under Fla. Stat. § 61.079(3), the right of a child to support cannot be adversely affected by any marital agreement. Courts determine custody (time-sharing) based on the child's best interests under Fla. Stat. § 61.13, regardless of any parental agreement.
What makes a postnuptial agreement invalid in Florida?
A Florida postnuptial agreement is invalid if: (1) it was obtained through fraud, deceit, duress, coercion, misrepresentation, or overreaching under Casto v. Casto; (2) one spouse concealed assets or failed to provide full financial disclosure; (3) the agreement is unconscionably unfair to one spouse who lacked financial knowledge; (4) it includes prohibited provisions regarding child support or custody; or (5) it was not in writing or signed by both parties.
Do both spouses need separate lawyers for a postnuptial agreement in Florida?
No, independent legal counsel is not legally required for either spouse under Florida law. A postnuptial agreement will not be set aside solely because one or both parties lacked representation. However, independent counsel for each spouse significantly strengthens enforceability by demonstrating that both parties understood the agreement's terms and implications. Courts view representation favorably when evaluating claims of duress or unconscionability.
Can a postnuptial agreement be changed after signing in Florida?
Yes, a postnuptial agreement can be amended, revoked, or abandoned after execution, but only by a written agreement signed by both parties. One spouse cannot unilaterally modify or revoke the agreement. The amendment should reference the original agreement, specify which provisions are changing, and follow the same execution formalities including notarization and witnesses for testamentary provisions.
How long does a postnuptial agreement last in Florida?
A Florida postnuptial agreement remains in effect until the marriage ends through divorce or death, unless the agreement specifies an expiration date or is revoked by written agreement of both spouses. There is no automatic expiration. Some couples include sunset clauses that terminate or modify the agreement after a certain number of years of marriage.
What is the difference between a prenup and postnup in Florida?
The primary difference is timing: a prenuptial agreement is signed before marriage, while a postnuptial agreement is signed after marriage. Legally, prenups are governed by Fla. Stat. § 61.079 (Uniform Premarital Agreement Act), where the marriage itself serves as consideration. Postnups require separate consideration (mutual promises) and face heightened judicial scrutiny because spouses owe each other fiduciary duties during marriage. Postnuptial agreements are generally considered less enforceable than prenuptial agreements in Florida courts.