Can a Prenup Waive 401(k) Rights in Florida?

1. Two Sets of Rules: Divorce and Death

A 401(k) answers to two different bodies of law, and a prenup works on only one of them.

In a divorce, Florida law decides who keeps what, and Florida lets a prenup decide it first. An agreement can say the 401(k) you brought into the marriage, everything you add during the marriage, and all of its growth stay yours. Florida courts enforce that kind of clause.

At death, the plan pays, and federal law (the Employee Retirement Income Security Act, usually called ERISA) tells the plan whom to pay. Federal law gives a surviving spouse a right to the account that Florida law cannot take away, and the prenup is a Florida document. The rest of this page is about closing that gap.

2. Why a Prenup Cannot Waive a Spouse’s 401(k) or Pension Rights

Federal law protects a spouse differently depending on the kind of plan.

• A 401(k) or other account-based plan. Most of these plans avoid the annuity rules only by paying the participant’s entire vested balance to the surviving spouse at death. Any other beneficiary, a child or a trust, takes only if the spouse consented.
• A traditional pension. The plan has to pay benefits as a joint and survivor annuity, so the spouse keeps receiving payments after the participant dies, and has to pay a survivor annuity if the participant dies before retirement. Giving up either one takes the spouse’s consent.

The Treasury regulations that administer these rules ask directly whether consent in an antenuptial agreement counts. The answer given is no. An agreement entered into before the marriage does not satisfy the consent requirement, even if the agreement is signed inside the plan’s election period. Before the wedding there is no spouse, and only a spouse can consent.

Federal courts have applied the rule against families who plainly meant otherwise. The federal appeals court in New York refused in 1992 to treat a prenup as a waiver of a widow’s rights in her husband’s profit-sharing plan, and the Eleventh Circuit, which covers Florida, applies the consent formalities strictly. The second case is told at the bottom of this page.

Government plans and church plans sit outside these federal rules and follow their own terms, so a Florida Retirement System or church pension needs its own reading.

3. How Does a Spouse Waive 401(k) Rights After the Wedding?

Clients are often confused about when the spouse signs, and ask me, “Can my fiancée sign the plan’s waiver now, before the wedding?” The answer is no. The consent that works is a separate document, signed by your spouse after the wedding, usually on the plan’s own form. Federal law sets four requirements.

1. In writing and signed by the spouse.
2. Names the beneficiary or the form of benefit, such as your children or your trust. A blank consent that lets you name anyone later works only if it says so expressly.
3. Acknowledges the effect, meaning the spouse states that the consent gives up the right to the benefit.
4. Witnessed by a notary public or a plan representative. A spouse’s signature that nobody witnessed does not count, even when the spouse admits signing it.

Timing depends on the plan. For a 401(k), the consent to a non-spouse beneficiary can be signed any time after the wedding. For a pension, the consent to give up the joint and survivor annuity has to be signed within the 180 days before payments begin, and the consent to give up the pre-retirement survivor annuity generally cannot be signed before the year the participant turns 35. A prenup can require the consent at the right moment, and it cannot replace the consent.

A consent binds only the spouse who signed it. If you divorce and remarry, the plan needs a new consent from the new spouse. Some plans also pay no survivor benefit until the couple has been married for a year, which is worth reading in the plan document before the wedding.

4. IRAs Follow the Beneficiary Form

An individual retirement account is outside the federal spousal-consent rules. The custodian pays whoever is named on the beneficiary form, and you can name your children without your spouse signing anything.

Florida law adds one claim at death. A surviving spouse can take 30 percent of the elective estate, and Florida counts amounts payable at death under retirement plans and similar arrangements in that estate. An IRA of $600,000 left to your children can therefore support a $180,000 claim by your spouse, paid from the people who received the assets, unless the prenup waived the elective share. A waiver signed before two witnesses closes that claim.

Three practical points follow from that claim.

• A rollover changes the rules. Money moved from a 401(k) into an IRA leaves the federal spousal right behind, so the waiver in the prenup becomes the protection that matters.
• A divorce voids an ex-spouse designation on an IRA under Florida law in most cases, and the rules differ for a 401(k). See your will and beneficiaries after a divorce.
• Naming a trust on an IRA has its own tax rules. See naming a trust as IRA beneficiary.

5. Retirement Growth During the Marriage Is Marital by Default

Florida divides marital property in a divorce, and the statute names retirement accounts specifically. Benefits, rights and funds accrued during the marriage in retirement, pension, profit-sharing, annuity and deferred-compensation plans are marital, whether vested or not.

Here is what that means for someone who brings $400,000 in a 401(k) into a marriage. The $400,000 starts out as separate property. Every contribution after the wedding is marital, along with the growth on those contributions. The growth on the original $400,000 is where the dispute usually happens, and the answer can turn on whether the account was managed with marital effort and how well the records trace the premarital balance.

A prenup settles all of it in a sentence. The agreement can say the account, every contribution and all growth stay the owner’s separate property, or it can split the account by a formula. The disclosure attached to the agreement should list every plan by name, including a pension the owner may not think of as an account. A Florida appeals court in 2009 upheld a prenup where an airline pilot left his pension off the schedule only because the agreement had its own section waiving pension benefits, and one judge would have thrown the agreement out.

See what a prenup covers and whether an inheritance is marital property for the same rules applied to other assets.

6. The Retirement Checklist for a Florida Prenup

The items I write into a prenup when either spouse has a workplace plan are listed below.

1. The divorce waiver. Each spouse’s retirement accounts, contributions and growth stay separate, or are split by a stated formula.
2. The death waiver. The elective share and the other spousal rights are waived by name, signed before two witnesses, so the IRA and every account that leaves federal protection are covered.
3. The promise to sign the plan consents. Each spouse agrees to sign every plan’s spousal consent within a stated number of days after the wedding, and again whenever a plan changes or a pension starts paying, with the right to a court order if a spouse refuses.
4. The fallback. If a spouse receives plan benefits the agreement says belong to someone else, that spouse agrees to disclaim them or pay them over. Whether a court will enforce that promise after the plan has paid is unsettled, which is why item 3 matters more.
5. The follow-up. After the wedding, the signed consents go to each plan administrator, and a written confirmation that the plan accepted them goes in the file.

A will plan includes a review of every beneficiary designation against the will, which is where most of these gaps are found. See whether a prenup replaces a will for the rest of the estate plan.

What It Costs

A prenup drafted for one spouse is a flat fee from $2,450, and a review of an agreement the other side drafted is a flat fee from $750. A postnup, which is how a married couple handles retirement accounts after the fact, is a flat fee from $2,950. What each prenup fee includes is set out on the prenup page.

The will plan, which includes the beneficiary designation review, is a flat fee from $1,200 for one person and $1,950 for a couple. Posted fees are honored for at least 90 days from September 2026. Government costs such as recording and filing fees are additional and passed through at cost.

Frequently Asked Questions

Common Situations

The second marriage at 62. A widow with a $900,000 401(k) marries again and signs a prenup leaving the account to her two sons. Her new husband never signs the plan’s consent. If she dies first, the plan pays him the whole balance, and her sons are left suing their stepfather on the prenup.

The rollover at retirement. A husband rolls his 401(k) into an IRA at 66 and names his daughter from his first marriage. The federal spousal right is gone once the money is in the IRA. What protects the daughter now is the prenup’s waiver of the elective share, and the waiver holds only if it was signed in front of two witnesses.

The pension that starts paying. A firefighter’s prenup says his pension belongs to his children. When he retires, the plan offers a single-life annuity or a joint and survivor annuity, and his wife has to consent within the plan’s window for the single-life option. The prenup obliges her to sign. If she refuses, the plan pays the survivor annuity until a court orders otherwise.

Sources of Law

• 29 U.S.C. §1055(a) (qualified joint and survivor annuity and qualified preretirement survivor annuity); §1055(b)(1)(C) (an individual account plan is excepted only if the participant’s nonforfeitable accrued benefit is payable in full on death to the surviving spouse, or to a designated beneficiary if the spouse consents in the manner required under subsection (c)(2)); §1055(c)(2)(A) (spouse consents in writing, the election designates a beneficiary or form of benefits, and the consent acknowledges the effect of the election and is witnessed by a plan representative or a notary public; consent effective only with respect to that spouse); §1055(c)(7) (applicable election period); §1055(f) (plan may require one year of marriage). 26 U.S.C. §417(a)(2) (parallel Code requirement).
• 29 U.S.C. §1051(6) (the participation, vesting and survivor-annuity part of ERISA does not apply to an individual retirement account under IRC §408); §1003(b) (governmental and church plans).
• Treas. Reg. §1.401(a)-20, Q&A-28 (“An agreement entered into prior to marriage does not satisfy the applicable consent requirements, even if the agreement is executed within the applicable election period.”); Q&A-29 (consent binds only the consenting spouse).
• Fla. Stat. §61.075(6)(a)1.e. (all vested and nonvested benefits, rights and funds accrued during the marriage in retirement, pension, profit-sharing, annuity, deferred compensation and insurance plans and programs are marital); §61.075(6)(b)1. and 4. (premarital assets, and assets excluded by valid written agreement, are nonmarital). Fla. Stat. §61.079(4)(a)1. and 5.
• Fla. Stat. §732.2035(8) (elective estate includes amounts payable by reason of surviving the decedent under any public or private pension, retirement or deferred compensation plan or similar arrangement); §732.2065 (30 percent); §732.702(1) (waiver signed before two subscribing witnesses); §732.703 (designation of a former spouse void on divorce, subject to the exceptions in subsection (4), including controlling federal law).
• Lasche v. George W. Lasche Basic Profit Sharing Plan, 111 F.3d 863 (11th Cir. 1997) (spouse’s consent to a beneficiary designation not witnessed by a plan representative or notary public is ineffective; the prenuptial agreement and its post-wedding amendment waiving retirement benefits did not cure it; surviving spouse entitled to the account). Hurwitz v. Sher, 982 F.2d 778 (2d Cir. 1992) (antenuptial agreement that did not designate a beneficiary or acknowledge the effect of the waiver was not an effective ERISA waiver; the court reserved whether an agreement deficient only because it preceded the marriage could suffice). Both opinions read in full.
• Gordon v. Gordon, 25 So. 3d 615 (Fla. 4th DCA 2009) (prenup upheld despite an undisclosed airline pension, because the agreement contained a section expressly waiving pension benefits; Ciklin, J., dissenting, would have reversed on an undervaluation of $143,000 to $229,000). Opinion read in full.
• Statutes, regulation and opinions retrieved October 6, 2026.

The Blank Line That Decided Who Got the Retirement Plan

Before a client signs off on a prenup, I confirm the thing that most often turns out to be wrong in the cases I read, and it is almost never the prenup itself. The usual failure is the plan paperwork after the wedding.

A Florida couple married in August 1985. The couple signed a prenup before the wedding in which each gave up any rights to the other’s property. After the wedding they did something most couples never think to do and signed an amendment in which each specifically gave up any interest in the other’s retirement plan and promised to sign whatever the plan needed. The husband had three daughters from an earlier marriage, and the plan was meant for them.

In 1989 he moved his retirement plan to a new brokerage. The account form named his three daughters, and his wife signed the spouse’s consent on it. Next to her signature was a space for a notary or the employer to sign as witness, and nobody filled it in. The husband died in 1993. His wife asked the plan for the money, the daughters refused, and she sued in federal court in South Florida.

The widow won the entire account, and the federal appeals court for Florida affirmed in 1997. Federal law requires the spouse’s consent to be witnessed by a plan representative or a notary, and the space was blank. The prenup and the amendment did not help the daughters, and neither did the fact that she admitted signing. In the court’s words, “A person's subjective intent is irrelevant to whether these requirements were followed.”

I have a few take-home points.

The first is that this couple did more than almost anyone does. The couple had a prenup, an amendment signed after the wedding that named retirement plans specifically, and a signed consent on the plan’s own form. One blank line undid all three.

The second is the routine moment. The plan moved to a new institution, the new form went around for signatures, and nobody checked the witness line. I see cases where the same mistake arrives at a rollover or a change of custodian, because every new plan asks for a new consent.

Practice pointer. Have the spouse sign the plan’s consent after the wedding in front of a notary, send it to the plan administrator, and keep the administrator’s written confirmation. Repeat the process every time the account moves to a new plan.

Avoid treating the prenup, or a consent signed in a hurry, as the end of the job. The plan follows its own form.

An honest limit belongs here. The opinion does not say how much was in the account, and the daughters’ separate claim against the brokerage was still pending when the appeal was decided, so the final family result is not in the record.

Kevin D. Klagge, Esq., admitted in Florida since 2012. The case above is a published opinion in other parties’ matter, not a matter this firm handled, and it predicts nothing about yours.

Updated on October 6, 2026. Reviewed by Kevin D. Klagge, Esq., Fla. Bar No. 99502. General information about Florida law, not legal advice, and no attorney-client relationship is created. Do not send confidential information until we have agreed to represent you.