Prenup for a Second Marriage: Estate and Retirement Rules

In a second marriage, a prenuptial agreement can matter as much in probate as it does in divorce. If either partner has children, trusts, a house intended for family, or a closely held business, the agreement can define what remains separate and which inheritance rights each prospective spouse waives or receives. Enforceability is never automatic: governing state law, voluntariness, disclosure, counsel, wording and execution formalities all matter.

It also has limits no drafting removes. Federal rules reserve certain retirement-plan rights to a spouse that a document signed before the marriage cannot waive, and your wills, trusts and beneficiary forms will not follow the agreement unless you change them. By the end, you should be able to judge whether an agreement is worth proposing, what makes one hold, and what must still be signed after the wedding.

What a premarital agreement can settle

The Uniform Premarital Agreement Act, approved by the Uniform Law Commission in 1983, lists what engaged couples may contract about: rights in property “whenever and wherever acquired or located,” its disposition at separation, divorce or death, spousal support, a will or trust to carry out the agreement, life insurance death benefits, and the governing law. One limit binds every agreement: a child’s right to support may not be adversely affected.

For a widow, the valuable provisions usually concern death: what stays separate, what each spouse receives at the other’s death, and which statutory rights each gives up. The commentary to the Commission’s 2012 act notes that an agreement may also grant a spouse additional rights if the marriage lasts a specified number of years. That is often fairer than an all-or-nothing waiver, and may be harder to attack.

Which rulebook your state follows

Premarital agreements are governed by state law, and standards differ. By 2012 the 1983 act had been adopted by 26 jurisdictions, roughly half with significant amendments. Under that act, an agreement fails if the spouse challenging it proves the signature was involuntary, or proves that the agreement was unconscionable when signed and that the challenger had no fair disclosure, no written waiver of disclosure, and no adequate knowledge of the other’s finances.

Commentators argued that the standard leaned too heavily toward enforcement, and in 2012 the Commission answered with the Uniform Premarital and Marital Agreements Act. It treats agreements signed before and during marriage alike, and each safeguard stands on its own: an agreement fails if consent was involuntary or the result of duress, if the challenger lacked access to independent legal representation, if an unrepresented party received neither a conspicuous notice of the rights being waived nor a plain-language explanation, or if financial disclosure was inadequate. Your state may follow either act, a modified version, or its own law. Ask which applies, and how it treats waivers at death.

Disclosure and counsel are the foundation

The 2012 act defines adequate disclosure as a “reasonably accurate description and good-faith estimate of value” of the other party’s property, liabilities and income. A party who receives less can still be bound if she expressly waives further disclosure in a separate signed record, or already has adequate knowledge of the other’s finances. Its commentary accepts approximate values for assets that are hard to price. In practice, attach a schedule: accounts, trust interests, real estate, the business, art, expected inheritances and debts, with the basis for each estimate.

Access to counsel, under the same act, means a reasonable time to decide whether to hire a lawyer, find one, obtain advice and consider it, and, when the other party has a lawyer, either the means to hire one or that party’s agreement to pay reasonable fees. The act stops short of requiring representation. Treat that as a floor. Each of you should have your own lawyer, chosen and paid independently, and the agreement should say so.

The wedding date is not a drafting deadline

Voluntariness is where hurried agreements fail. The official comment to the 2012 act collects appellate decisions in which agreements presented one to three days before a wedding were found voluntary by some courts and involuntary by others. No fixed number of days is a safe harbor. Begin before the date is announced, exchange disclosure early, and sign when both lawyers have finished rather than when the invitations are printed. Our guide to dating after widowhood and the money conversation suggests how to raise the subject gracefully.

In a second marriage, a prenuptial agreement is less a plan for divorce than a plan for the day one of you is widowed again.

Waiving what a surviving spouse could otherwise claim

Depending on the state, a surviving spouse may hold rights a will alone cannot defeat, among them an elective share, homestead protection, exempt property and a family allowance. A second-marriage agreement often waives them, usually in both directions.

Florida’s 2026 statute shows how exact the rules can be. It permits a waiver of the elective share, intestate share, pretermitted share, homestead, exempt property, family allowance, certain community-property-at-death claims and preference as personal representative of an intestate estate. For Florida residents, the waiving party signs in the presence of two subscribing witnesses; the statute separately recognizes some nonresident agreements that were valid where executed. Florida requires fair disclosure under this probate-waiver statute for an agreement signed after marriage, but not one signed before marriage. Unless the waiver says otherwise, a waiver of “all rights” also renounces benefits under the other spouse’s will if that will predates the waiver. Those probate rules do not answer every divorce-law or contract-law issue, so full disclosure and state-specific counsel remain prudent even where the statute does not demand them.

The retirement-plan waiver a prenuptial agreement cannot make

Treasury Regulation 1.401(a)-20, Q&A-28, asks whether consent contained in an antenuptial agreement satisfies the spousal-consent rules for qualified plans. The answer is no, “even if the agreement is executed within the applicable election period.”

The Department of Labor describes what those rules protect. In a defined benefit or money purchase plan, unless both spouses choose otherwise, a married participant’s pension is paid as a joint and survivor annuity, and the survivor receives at least half the benefit paid during their joint lives. In most 401(k) and other defined contribution plans, the account goes to the surviving spouse if the participant dies before receiving it. Choosing otherwise requires the spouse’s written consent, witnessed by a notary or plan representative. The regulation adds that consent generally must name the specific nonspouse beneficiary, or the trust, unless the plan permits a general consent, and that it binds only the spouse who signed it; a consent signed by your new spouse’s former spouse does not bind you.

The remedy is sequence. Have the agreement obligate each of you to sign the plan’s consent after the wedding, then sign it within the election period the plan allows; a consent signed too early may not count. Timing also cuts the other way. If your new husband’s pension is already being paid when you marry, the regulation gives its survivor protection to the spouse he was married to when payments began, even if they have since divorced, unless a qualified domestic relations order provides otherwise. Ask each plan administrator, and any IRA custodian, how that account treats a spouse.

What remarriage does to benefits you already receive

Social Security generally treats a remarriage before age 60 as a bar to widow’s or surviving-divorced-spouse benefits while that marriage continues. A remarriage at 60 or later is disregarded for this purpose. For a disabled widow, remarriage at 50 or later may also be disregarded when the disability and other requirements are met. If a disqualifying later marriage ends by death, divorce or annulment, entitlement or re-entitlement may begin with the month it ends if every other requirement is satisfied. Under the Treasury regulation governing qualified survivor annuities, a survivor annuity already payable from your late spouse’s qualified plan continues after remarriage.

Other programs have their own rules, which remarriage after widowhood sorts through. If you carry an unused estate-tax exclusion from your late husband’s estate, ask how a second widowhood would affect it; the $15 million exemption explains the stakes.

Make the rest of the estate plan agree with it

An agreement promises; your other documents deliver. Retirement plans, life insurance and payable-on-death accounts generally pass under the institution’s beneficiary records rather than your will. After the wedding, sign new wills, amend revocable trusts, update every beneficiary form, and obtain written confirmation of each change. If the agreement promises your spouse a life interest in the house or an insurance-funded trust, the documents that deliver it must be signed and funded. Estate planning in a blended family covers the trust designs.

Questions to settle before you sign

1. Which state’s law governs the agreement, and does it follow the 1983 act, the 2012 act, or neither?
2. Has each of us received a written schedule of the other’s assets, debts and income?
3. Does each of us have independent counsel, engaged early enough to matter?
4. Which rights at death is each of us waiving, and what does each receive in exchange?
5. Does each waiver meet the witnessing and disclosure rules of our state, and of any state we may move to?
6. Which retirement plans require spousal consent after the wedding, and who will send the forms?
7. How will the marriage affect my Social Security survivor benefit and any pension survivor annuity?
8. Which wills, trusts and beneficiary forms must change after the wedding, and who confirms each?
9. Should the new spouse’s rights grow as the marriage lengthens, and when will we review the agreement?

This article provides general U.S. educational information and is not legal, tax, benefits, or investment advice. Premarital-agreement law varies by state; confirm current rules with each plan administrator, the Social Security Administration, and a lawyer licensed where you live.