Prenuptial Agreements in Florida: What They Cover, What They Can’t, and What Makes Them Enforceable

If you are considering a prenuptial agreement — or your partner has raised the topic — understanding what a prenup can actually do, what it cannot include under Florida law, and what determines whether it holds up if it is ever challenged gives you the foundation to make an informed decision about whether one makes sense for your situation.

Prenuptial & postnuptial agreements serve related but distinct purposes — a prenup is executed before marriage, while a postnuptial agreement addresses the same types of provisions after the wedding has already occurred.

What a Prenuptial Agreement Can Cover

Asset and Property Protection

A prenup can define which assets each spouse brought into the marriage and establish that those assets — and any appreciation on them — remain separate property in the event of divorce. Without a prenup, Florida’s equitable distribution framework applies by default, which generally treats assets acquired during the marriage as marital property subject to division.

Pre-marital real estate, investment accounts, family inheritances, and business interests are among the most common assets people seek to protect. A prenup can also address how property acquired during the marriage is characterized — whether it becomes marital property or remains separate depending on how it is titled or funded.

Business Interest Protection

For business owners, a prenup is one of the most direct tools available to prevent a divorce from disrupting a business. Without one, a spouse may have a claim to the value of the business — or its growth during the marriage — as a marital asset. A prenup can establish that the business, including its appreciation, remains the owner’s separate property regardless of the marriage’s duration.

Alimony and Spousal Support

Florida law allows spouses to waive or limit alimony through a prenuptial agreement. A complete waiver of spousal support, a cap on the amount or duration, or a defined formula tied to the length of the marriage are all permissible provisions. Courts will not enforce an alimony waiver, however, if enforcement would leave one spouse eligible for public assistance — a narrow but real limitation.

Debt Liability

A prenup can allocate responsibility for pre-marital debt and establish that debts incurred by one spouse during the marriage do not become the other’s liability. This is particularly relevant when one party enters the marriage with significant student loans, business debt, or other obligations.

Estate Planning Integration

Prenuptial agreements are frequently used alongside estate planning documents — particularly in second marriages or blended family situations — to define what each spouse’s children from prior relationships will inherit. Without a prenup, Florida’s elective share statute gives a surviving spouse the right to claim a portion of the deceased spouse’s estate regardless of what the will says.

What a Prenuptial Agreement Cannot Cover

A prenup cannot address child custody or child support. Courts retain independent authority over both, based on the best interests of the child at the time of divorce — not on what the parents agreed to before the marriage. Any custody or support provision in a prenup is unenforceable.

A prenup also cannot include provisions that are illegal, that incentivize divorce, or that attempt to regulate purely personal conduct in ways courts consider inappropriate.

What Makes a Florida Prenup Enforceable

Voluntary Execution

Both spouses must sign the agreement voluntarily — free from duress, coercion, or undue pressure. Presenting a prenup the night before the wedding and demanding a signature is the most commonly cited example of circumstances that can support an involuntary execution claim. Timing matters: the closer to the wedding the agreement is signed, the more scrutiny it receives.

Full Financial Disclosure

Each spouse must provide a fair and reasonable disclosure of their assets, liabilities, and financial circumstances. A prenup signed without meaningful disclosure — or based on a deliberately incomplete picture of one spouse’s finances — is vulnerable to challenge on fraud or misrepresentation grounds.

Independent Legal Counsel

Florida does not require both spouses to have separate attorneys, but the absence of independent counsel is a significant risk factor. A spouse who later claims they did not understand what they were signing is in a stronger position if they had no attorney reviewing the agreement on their behalf. Independent counsel for both parties is the clearest way to demonstrate that both spouses entered the agreement knowingly.

If the Wedding Has Already Occurred

Postnuptial Agreements

A postnuptial agreement serves the same basic function as a prenup but is executed after the marriage. Florida courts apply similar enforceability standards — voluntary execution, full disclosure, and absence of fraud or coercion. Postnuptial agreements can address the same categories of assets, debt, and support as a prenup, and are a viable option for couples who did not execute a prenup before the wedding or whose circumstances have changed significantly since they married.