Skip to content
StepUp Law logo StepUp Law

Florida Postnuptial Agreements

Didn’t do a prenup, or life changed after the wedding? A postnup sets the rules now.

Same protections as a prenup, signed after marriage, when a business grows, an inheritance arrives, or a second marriage begins.

Book a free 30-minute consult Not married yet? See prenups

Quick Overview

A Florida postnuptial agreement is signed after you are already married and sets out what property is separate, how debts and alimony are handled, and what happens at death. It can waive a spouse’s right to roughly 30% of your estate, which matters most in a second marriage. Florida holds it to a higher standard than a prenup, so how it is made comes down to the points below.

Topics to Know HideShow

Below, we walk through the 3 issues that decide whether this is the right move for you. Jump to any one:

  1. What a Postnup Does It decides what is separate versus marital property, who can claim alimony, and what happens at death. One thing it cannot touch, though, is set later by Florida.
  2. Held to a Higher Standard Florida scrutinizes a postnup harder than a prenup because spouses owe each other a duty of fairness. Miss the disclosure requirements and a court can throw it out.
  3. The Estate-Planning Reason A surviving spouse can claim about 30% of your estate plus homestead rights regardless of your will. A postnup is the written agreement that waives or reshapes those claims.

That’s the quick version. The details below are what decide your situation, and where the costly mistakes hide.

What a Postnup Does

A postnuptial agreement is a prenup’s after-the-wedding cousin. It lets you and your spouse decide what’s separate and what’s marital property, how debts are handled, whether either of you can claim alimony, and what happens at death. Couples reach for one when something changed: a business took off, an inheritance landed, a second marriage began without a prenup, or they are rebuilding trust and want the terms in writing. Like a prenup, it cannot set child support or custody, Florida decides those later by the child’s best interests.

Held to a Higher Standard

Florida scrutinizes a postnup more closely than a prenup. A prenup has its own statute; a postnup is governed by contract law, and because spouses owe each other a duty of fairness, courts look harder at how it was made. To hold up, it must be in writing, signed voluntarily, with full and fair financial disclosure, and it cannot be unconscionable. Each spouse should have independent legal advice. Built that way, it is enforceable.

The Estate-Planning Reason

This is often the real driver. In Florida, a surviving spouse can claim about 30% of your estate (the elective share) plus homestead rights, regardless of your will, unless waived in a valid written agreement. A postnup can waive or shape those rights, which is essential in a second marriage where you want to provide for your spouse but leave the bulk to children from a prior relationship. We coordinate it with your will or trust and beneficiary designations so everything agrees.

Life changed. Update the plan.

A free 30-minute consult covers whether a postnup fits, what to include, and what it costs.

Book your free consult

Frequently Asked Questions

What Is a Postnuptial Agreement?

It is the same idea as a prenup, signed after you are already married. It sets out what is separate and what is marital property, how debts are handled, whether either spouse can claim alimony, and what happens to your property at death. Couples reach for one when a business takes off, an inheritance arrives, a second marriage begins without a prenup, or they are rebuilding trust and want clarity. Like a prenup, it cannot predetermine child support or custody.

Is a Postnuptial Agreement Enforceable in Florida?

Yes, when it is done right, but Florida holds it to a higher standard than a prenup. A prenup is governed by a specific statute; a postnup is governed by contract law, and because spouses owe each other a duty of fairness and good faith, courts scrutinize it more closely. It needs to be in writing, signed voluntarily, with full and fair financial disclosure, and it cannot be unconscionable. Each spouse should have independent legal advice. Done that way, it holds up.

Postnup vs Prenup: Which Do I Need?

If you are not yet married, a prenup is simpler and gets more deference from the courts. If you are already married, a postnup is the tool, and it can do nearly everything a prenup can. The most common reasons to do a postnup are a change since the wedding (a business, an inheritance, a windfall, or a move into a blended-family situation) or simply never having done a prenup. We help you decide and draft whichever fits.

Can a Postnup Handle Estate Planning?

Yes, and that is often the point. In Florida a surviving spouse can claim about 30% of your estate (the elective share) plus homestead rights, regardless of your will, unless waived in a valid written agreement. A postnup can waive or shape those rights, which is essential in a second marriage where you want to provide for your spouse but leave the bulk to children from a prior relationship. We coordinate it with your will, trust, and beneficiary designations.

Can a Postnup Cover Our Retirement Accounts?

Yes, but workplace retirement plans need one extra step. Federal law gives your spouse rights in a 401(k) or pension that the agreement alone cannot release; the release only counts on the plan’s own spousal-consent form, signed and witnessed the way the plan requires. Here a postnup has an advantage: you are already married, so you can sign those plan forms right away, and the agreement obligates each of you to do it. We build that step in and follow through so the paperwork matches the promise. IRAs get a similar check of their own consent language.

Sources of Law

Updated on July 12, 2026. Reviewed by Kevin D. Klagge, Esq., Fla. Bar No. 99502. Attorney Kevin Klagge represents families, businesses, and international clients in estate planning and international law, with a focus on Florida legal tools. He litigates estate and business issues in court. General information about Florida law, not legal advice, and no attorney-client relationship is created. Each spouse should have independent counsel. Do not send confidential information until we have agreed to represent you.