Prenuptial Agreements and Estate Planning in New York

Most people treat a prenuptial agreement and an estate plan as two separate things. One belongs to matrimonial law. The other belongs to estate planning. In my practice, that separation causes real harm. A prenup without a coordinated estate plan can leave your intentions legally unenforceable. An estate plan without a prenup can unravel the moment your spouse exercises their elective share right. These documents belong together — drafted together, reviewed together, and updated together.

What a Prenuptial Agreement Actually Does in an Estate Planning Context

People sign prenups for all kinds of reasons. They want to protect a family business. They want to preserve inheritance for children from a first marriage. They want to define what's separate property and what's marital. All of that is legitimate. But the most important estate planning function of a prenuptial agreement is one that many couples don't fully understand: it's the only way to waive New York's elective share right before marriage.

Under EPTL § 5-1.1-A, every surviving spouse in New York has the right to elect against the decedent's will and claim a statutory minimum share — the greater of $50,000 or one-third of the net estate. This right exists regardless of what the will says. You can't eliminate it through your estate plan alone. You can plan around it with trusts. But you can only truly waive it through a written agreement signed by the spouse.

A prenuptial agreement can accomplish that waiver before the wedding. Done properly, this gives both spouses certainty: the elective share won't be a surprise, and your estate plan can be structured to reflect your actual wishes rather than a legal floor you're forced to accommodate.

For couples entering a second marriage with children from prior relationships, this coordination isn't optional — it's essential. Our post on estate planning after a second marriage in New York covers the QTIP trust and other tools that work alongside prenuptial agreements in blended family planning.

New York's Requirements for a Valid Prenuptial Agreement

Domestic Relations Law § 236(B)(3) governs prenuptial agreements in New York. The requirements are specific, and courts enforce them strictly. An agreement that doesn't meet them won't protect you when it matters most.

A valid New York prenuptial agreement must:

• Be in writing — oral prenuptial agreements don't exist under New York law
• Be signed by both parties before the marriage
• Be acknowledged before a notary in the form required for recording a deed
• Not have been obtained through fraud, duress, or overreaching
• Not be unconscionable at the time of signing

The acknowledgment requirement catches people. A regular notarization isn't enough. New York requires the formal acknowledgment used in real estate transactions — both parties must separately appear before a notary and acknowledge the agreement as their own free and voluntary act. If this step is skipped or done incorrectly, the entire agreement can be invalidated in probate court years later.

Both parties should have independent legal counsel. This isn't a strict legal requirement, but courts scrutinize prenups much more carefully when one party didn't have their own attorney. I've seen agreements fall apart in litigation because a judge found the unrepresented party didn't truly understand what they were signing. If you want the waiver to stick, both sides need a lawyer.

The Elective Share Waiver: What It Does and Doesn't Cover

When a prenuptial agreement includes an elective share waiver, it tells New York's Surrogate's Court that the surviving spouse has given up their EPTL § 5-1.1-A right. Your estate plan can then be structured as if that right doesn't exist — which opens up significantly more flexibility in how you distribute your estate.

But the waiver has limits. A prenuptial agreement can waive the elective share right, but it doesn't automatically override beneficiary designations on retirement accounts or life insurance policies. Those assets pass outside the probate estate entirely. A prenup that says "spouse receives nothing" won't prevent your spouse from claiming a named IRA beneficiary interest — unless the prenup also specifically addresses those assets, and the beneficiary designation was changed accordingly.

I've seen this gap create serious problems. A client came to me after her husband died. His prenuptial agreement said each spouse waived their rights to the other's "estate." The husband had a $650,000 401(k) still naming his wife as beneficiary — left over from before the prenup was signed. He'd intended to change it but never did. The prenuptial agreement didn't cover the retirement account. His children from a prior marriage lost $650,000 they expected to inherit.

An elective share waiver in a prenup must be paired with updated beneficiary designations and a coordinated estate plan. The waiver is the legal foundation. The estate plan is the structure built on top of it. Neither is sufficient without the other.

Trust Planning That Works With a Prenuptial Agreement

When a prenuptial agreement waives the elective share, the estate plan has room to operate freely. But even when a waiver exists, trust structures remain important — and in many cases, they're required to carry out what the prenup contemplates.

QTIP Trusts

A Qualified Terminable Interest Property trust gives your surviving spouse a lifetime income interest while preserving the principal for remainder beneficiaries you designate — typically children from a prior marriage. When a prenup waives the elective share, the QTIP structure becomes cleaner: you don't have to worry about whether the trust income satisfies the statutory minimum. You can design it purely to match your intentions.

For large estates, QTIP trusts also provide federal and New York estate tax benefits. Assets passing to a QTIP trust qualify for the marital deduction, deferring estate tax until the surviving spouse's death. With New York's 2026 estate tax exemption set at $7.16 million, this deferral matters for many families in Manhattan, Brooklyn, and the surrounding suburbs.

Bypass Trusts

A bypass trust (also called a credit shelter trust) captures the first-to-die spouse's estate tax exemption and holds it outside the survivor's taxable estate. Assets in the bypass trust can benefit the surviving spouse — through discretionary distributions — while ultimately passing to children or other beneficiaries free of estate tax. When paired with a prenuptial agreement that defines separate property clearly, the bypass trust works more predictably: there's no dispute about which assets fund it.

Irrevocable Life Insurance Trusts

An ILIT holds a life insurance policy outside the taxable estate. The death benefit pays to the trust, which distributes proceeds to named beneficiaries. Many couples use ILITs to equalize inheritances in blended family situations — the surviving spouse receives the real estate and investment portfolio, while the decedent's children from a prior marriage receive a comparable amount through the ILIT. When the prenuptial agreement is coordinated with the ILIT design, this equalization can be structured clearly and without dispute.

What Happens When a Prenup and an Estate Plan Conflict

This is where things get expensive. When a prenuptial agreement and an estate plan weren't drafted together — or weren't updated together after life changed — they can produce results nobody intended.

Common conflicts I've seen:

The Prenup Is Silent on Trusts

Some prenuptial agreements waive only the "right to take against the will." They don't address QTIP trust income, bypass trust benefits, or other trust distributions the surviving spouse might receive. When the estate plan relies heavily on trusts, a narrowly worded prenup may not actually protect what the parties thought it protected. Courts then have to interpret ambiguous language — at significant cost to the estate.

The Estate Plan Was Drafted Before the Prenup

I've reviewed estate plans drafted the week before a wedding while the prenup was still being negotiated. The will referenced assets as joint property that the prenup defined as separate. The trust named a beneficiary the prenup excluded. These documents need to be drafted on the same timeline, with the same underlying facts.

Life Changed and Neither Document Was Updated

A prenup signed at 45 may not reflect a 65-year-old's situation. Assets grow, children mature, businesses are sold, and new assets are acquired. If the prenup defines "separate property" by reference to a specific schedule that's now 20 years old, that definition may not cover a $3 million stock portfolio that didn't exist when you married.

Estate plans and prenuptial agreements both need regular review. I recommend a comprehensive review every three to five years and immediately after any major financial change — sale of a business, inheritance, significant appreciation in real estate. Our estate planning team conducts these reviews and coordinates with matrimonial counsel when prenuptial agreements need updating.

Second Marriages: Why the Prenup Is Even More Critical

For people entering a second marriage, a prenuptial agreement isn't just helpful — it's the foundation of the entire estate plan. Without it, you're trying to protect children from a first marriage using trust structures that may or may not be sufficient to address the elective share.

Here's the reality in New York: a QTIP trust can satisfy or offset the elective share, but its ability to do so depends on the trust's income, the estate's value, and the surviving spouse's decision whether to claim the elective share at all. If the marriage goes badly, a surviving spouse with a QTIP trust might still bring a claim that the trust income doesn't satisfy the full one-third statutory share. That litigation costs money and delays distribution to everyone.

A prenuptial agreement that waives the elective share eliminates that risk entirely. The children from the first marriage can be protected with certainty — not with probability.

For a full picture of the tools available in second-marriage estate planning, our guide on estate planning for blended families in New York covers every major structure, from QTIP trusts to ILITs to revocable trusts with specific distribution provisions.

Postnuptial Agreements: When You're Already Married

What if you're already married without a prenup and wish you had one? You're not out of options. A postnuptial agreement — signed after the wedding — can accomplish many of the same goals, including an elective share waiver.

Postnuptial agreements are subject to greater judicial scrutiny than prenups. Courts recognize that the dynamic inside a marriage is different from negotiations before a wedding — there's more potential for coercion or unequal bargaining power. New York courts apply a stricter "fair and reasonable" standard to postnups.

But a well-drafted postnuptial agreement, with independent counsel for both parties and full financial disclosure, is enforceable. I've used them successfully in situations where couples wanted to update their planning years into a marriage — especially when significant wealth was created after the wedding and the original estate plan no longer reflected the family's situation.

The process for a postnuptial agreement mirrors that for a prenup: written, acknowledged before a notary, both parties represented, full financial disclosure, no duress. Give the process adequate time — courts look unfavorably on postnups that appear rushed.

The EPTL Framework: What the Law Actually Says

For those who want the statutory foundation, here's the relevant New York law in plain terms:

The interplay between DRL § 236(B)(3) and EPTL § 5-1.1-A(e) is where the prenup meets the estate plan. When both documents are drafted by attorneys who understand both bodies of law, the result is a plan that actually works. When each document is drafted in isolation — the prenup by a matrimonial attorney who doesn't know the estate plan, the will by an estate attorney who hasn't read the prenup — gaps appear that courts fill unpredictably.

What to Bring to the Prenuptial Agreement Conversation

If you're planning a prenuptial agreement, you'll need to provide financial disclosure — a complete list of your assets, liabilities, income, and anticipated inheritances. This disclosure is required for the agreement to be enforceable. Concealing assets can void the entire prenup.

You should also come prepared to discuss:

• What property you want to remain separate on death (not just in a divorce)
• Whether you want to waive the elective share entirely or modify it
• What your spouse will receive if you die first — income, a specific asset, a lump sum
• How your children are to be protected and how inheritance is to be structured
• What happens to appreciation on separate property assets — does a co-op that doubles in value remain entirely separate?
• How the prenup coordinates with the estate plan you intend to create

These conversations are not comfortable. They force you to think about your death, your marriage ending, and money in the same room at the same time. But they're the conversations that produce a plan that actually protects everyone involved.

Resources at Morgan Legal NY's estate planning resource page provide additional context on how New York courts handle elective share disputes when prenuptial agreements are challenged.

Getting the Coordination Right

A prenuptial agreement and an estate plan that work together look like this: the prenup establishes the legal framework — what each spouse waives, what each spouse retains, what each spouse receives on death. The estate plan implements that framework — through specific trust structures, will provisions, and beneficiary designations that reflect exactly what the prenup contemplates. Every asset has a designated path. Every person with a stake in the estate knows what to expect.

When couples come to us before a marriage, we coordinate the prenuptial agreement with the estate plan in a single integrated process. Both documents are drafted with the same underlying facts. Both are signed on the same timeline. Both are stored together and reviewed together when circumstances change. That's how you build a plan that holds up.

At Morgan Legal Group, P.C., our estate planning team works directly with matrimonial counsel to coordinate prenuptial agreements with wills, trusts, and beneficiary designations. We serve families across Manhattan, Brooklyn, Queens, the Bronx, and Staten Island. If you're getting married — or already married and wondering what can still be done — we're available for a free consultation.

Russel Morgan, Esq.

Founding Partner — Morgan Legal Group, P.C.

Over 20 years in New York estate planning, probate, and elder law. Russel Morgan has helped more than 5,000 families across New York City structure estate plans that hold up when challenged — including hundreds of blended family cases requiring prenuptial agreement coordination.