Can a Prenup or Postnup Waive Alimony in FL?

A prenup or postnup can waive alimony in Florida, and courts enforce those waivers when the agreement is valid. A prenuptial agreement can eliminate or limit spousal support before you marry, and a postnuptial agreement can do the same after the wedding. The catch is enforceability.

A judge will only honor an alimony waiver if the agreement was signed voluntarily, backed by fair financial disclosure, and not so one-sided that it shocks the conscience. Get any of those wrong and the waiver can fall apart in a divorce.

Can You Legally Waive Alimony in a Prenup in Florida?

You can. Florida Statute 61.079, the state’s premarital agreement law, lets couples decide spousal support in advance.

A valid prenup can:

• Waive alimony entirely, so neither spouse can claim it.
• Cap the amount either spouse could receive.
• Limit the duration of any future support.
• Set the type of alimony allowed, if any.

This is one of the most common reasons couples sign a prenup, especially when one person enters the marriage with substantial assets or a high income. To see how these agreements are built, review our overview of Florida prenuptial agreements.

What Makes a Prenup Alimony Waiver Enforceable?

A signature alone does not guarantee enforcement. Florida courts look at how the agreement was made. An alimony waiver generally holds up when:

• It is in writing and signed by both parties.
• Each spouse entered it voluntarily, without fraud, duress, or coercion.
• There was fair and reasonable disclosure of each party’s assets and debts, or a valid written waiver of that disclosure.
• The terms are not unconscionable, meaning not so unfair that no reasonable person would agree.

Timing matters too. A prenup handed over the night before the wedding, with no time to review or consult a lawyer, invites a challenge based on duress. Giving each side its own attorney and plenty of lead time is the best protection.

To make an alimony waiver as durable as possible, strong agreements usually also:

• Attach a detailed financial schedule listing each party’s assets, debts, and income.
• Include a statement that each party had time to review and seek independent counsel.
• Avoid last-minute signing, ideally finalizing well before the wedding date.
• Use clear, specific language about exactly what alimony is waived or limited.

The more the document shows a fair, informed, unpressured process, the harder it is for a spouse to unwind it years later.

Can a Postnuptial Agreement Waive Alimony After Marriage?

Yes. A postnuptial agreement, signed after you are already married, can also waive or limit alimony. But postnups are governed by Florida contract and case law rather than the premarital statute, and courts scrutinize them closely because spouses owe each other a duty of good faith once married. To stand up, a postnup generally must show:

• Full and frank financial disclosure between the spouses.
• No fraud, duress, or overreaching by either side.
• Fairness given each spouse’s knowledge of the other’s finances.

Because the standard is demanding, a poorly drafted postnup is easier to attack than a well-prepared prenup. Independent legal advice for each spouse is strongly recommended.

What Can a Prenup or Postnup Not Do?

Alimony is fair game, but these agreements have limits. In Florida, a prenup or postnup cannot:

• Waive or reduce child support, which belongs to the child, not the parents.
• Predetermine child custody or time-sharing, which a court decides based on the child’s best interests.
• Include terms that are illegal or against public policy.

So even an ironclad alimony waiver leaves child-related issues to the court. Trying to bargain those away can weaken the entire agreement.

Can an Alimony Waiver Ever Be Thrown Out?

It can. A spouse who wants to escape an alimony waiver will attack how the agreement was signed. Common grounds for setting one aside include:

• Coercion or duress, such as pressure right before the wedding.
• Hidden or misrepresented assets during disclosure.
• No opportunity to consult counsel before signing.
• Unconscionable terms combined with a lack of disclosure.

If a court finds the waiver invalid, alimony goes back on the table under Florida Statute 61.08, and the judge decides support as if the waiver never existed. Also, if an alimony waiver causes a spouse to become eligible for public assistance at the time of separation or dissolution, the court may bypass the waiver and order support to avoid public eligibility.  That is why careful drafting is not optional. It is the whole point.

Should You Get a Prenup or a Postnup?

Both can waive alimony, so the right choice usually comes down to timing and circumstances. A quick comparison:

• Prenup: Signed before the wedding. It is generally easier to enforce because both parties are still deciding whether to marry and can walk away.
• Postnup: Signed after the wedding. It is useful when circumstances change, such as an inheritance, a new business, or a reconciliation after a rough patch.

Reasons couples reach for one or the other include:

• Protecting premarital wealth or a family business before marriage.
• Shielding a future inheritance either party expects to receive.
• Resetting expectations after a major financial event during the marriage.
• Clarifying support terms so a future divorce is less contentious.

Because a postnup is held to a stricter standard, couples who can plan ahead often find a prenup gives them stronger protection.

Can You Challenge or Update an Existing Agreement?

Yes on both counts. An agreement is not automatically bulletproof, and it is not frozen forever. If you believe an alimony waiver was unfair or improperly signed, you can challenge it in the divorce by arguing:

• There was no meaningful financial disclosure.
• You signed under pressure or duress.
• The terms are unconscionable.

If your circumstances have changed since you signed, you can also update the agreement by mutual consent. Common reasons to revisit an older prenup or postnup include:

• A large shift in income or assets for either spouse.
• The birth of children or other major life changes.
• Terms that no longer reflect what either party intended.

Updating an agreement the right way, with disclosure and independent advice, keeps it enforceable when it counts.

Frequently Asked Questions

Does a prenup waiver cover temporary support during the divorce?

Not always. Florida courts are reluctant to enforce a waiver of temporary support if it would leave one spouse unable to cover basic needs while the case is pending.

Do both spouses need their own lawyer for a valid waiver?

Separate lawyers are not strictly required, but they make an agreement much harder to challenge later. Independent advice supports the argument that both people signed knowingly and freely.

Can we add an alimony waiver after we are already married?

Yes, through a postnuptial agreement. It works differently from a prenup and rests on general contract rules, so careful drafting matters even more.

Will Florida enforce a prenup signed in another state?

Often yes, if the agreement was valid where it was signed. A Florida court will still review it for fairness and proper disclosure before enforcing an alimony waiver.

Lock In Your Agreement the Right Way

A waiver only protects you if it survives a challenge, so build it to last:

• Put everything in writing, with full financial disclosure attached.
• Give both spouses their own attorney and real time to review.
• Revisit an older agreement if your finances have changed significantly.

The family law attorneys at Nest Law draft prenups and postnups that hold up when they matter most, and challenge the ones that were done wrong. Contact us today to protect your income before or after the wedding.

This post is for general information only, not legal advice. For guidance on your specific situation, speak with a qualified Florida family law attorney.