If you are entering a marriage or remarriage with significant assets, children from a prior relationship, a business, inherited property, or a specific vision for your legacy, you may hear that you need a will, a trust, a prenuptial agreement—or all three.
These documents are related, but they do very different jobs.
A will or trust primarily addresses what happens to your property during incapacity and after death. A marital agreement, such as a prenuptial or postnuptial agreement, defines certain property rights between spouses during marriage, upon divorce, and at death.
Treating one as a substitute for the other can leave serious gaps in your plan.
What Wills and Trusts Are Designed to Do
A will or trust allows you to decide who should receive your property, when they should receive it, and, in the case of a trust, how those assets should be managed.
A properly funded revocable living trust may also help:
- avoid probate for trust-owned assets
- provide continuity if you become incapacitated
- manage inheritances for children or other beneficiaries
- control how and when beneficiaries receive property
For many married couples, traditional estate planning documents may be enough—particularly when most assets were accumulated together, both spouses want the same beneficiaries, and their children are shared.
But marriage creates legal rights that a will or trust cannot always eliminate on its own.
Why a Will or Trust May Not Be Enough
Suppose you enter a second marriage with substantial assets you accumulated before the marriage.
You want your new spouse to be financially secure, but you also want certain property to pass to your children from a prior relationship.
You might assume that your will or trust can simply say so.
The problem is that state law generally provides surviving spouses with certain inheritance rights. Those rights may apply regardless of what your estate planning documents say.
That is where a marital agreement can become important.
Understanding a Surviving Spouse’s Elective Share
Elective share laws are designed to prevent one spouse from completely disinheriting the other.
Historically, these protections addressed situations where one spouse earned and held most of the family wealth while the other spouse contributed through childcare, household responsibilities, and other nonfinancial support.
Without legal protection, the titled spouse could theoretically leave everything to someone else and leave the surviving spouse with little or nothing.
Elective share laws generally allow a surviving spouse to claim a portion of the deceased spouse’s estate even when the will or trust provides otherwise.
The amount and the property included in that calculation vary significantly by state, but the basic principle is important: marriage itself can create inheritance rights.
When Spousal Rights Conflict With Your Estate Plan
The same laws designed to protect spouses can sometimes interfere with an otherwise intentional estate plan.
Imagine someone who owns a home and substantial savings before marriage and has long planned to leave those assets to children, a charity, or another beneficiary.
Their future spouse understands the plan and verbally agrees.
But after the owner dies, the surviving spouse exercises rights available under state law and claims a share of the estate.
The will may have clearly expressed the deceased spouse’s wishes, but a verbal agreement generally does not waive statutory inheritance rights.
A properly drafted marital agreement may.
What a Prenuptial or Postnuptial Agreement Does
A prenuptial agreement is signed before marriage. A postnuptial agreement is entered into after marriage.
Both are contracts that can define how property and financial rights will be treated between spouses.
Depending on state law and the terms of the agreement, a marital agreement may address:
- which assets are separate property
- which assets will become marital property
- what happens to property upon divorce
- what each spouse is entitled to receive at death
- whether either spouse waives certain inheritance rights
- how premarital assets, businesses, or inheritances will be treated
- whether property may pass to children from prior relationships or other beneficiaries
This can be particularly valuable in a remarriage or blended family.
Why Would a Spouse Waive Inheritance Rights?
A waiver does not necessarily mean that one spouse is trying to deprive the other.
Often, both spouses enter the marriage with their own assets and their own estate planning goals.
For example:
- each spouse may want to preserve premarital assets for their own children
- one spouse may own a family business intended to remain within that family
- one or both spouses may expect significant inheritances
- each spouse may already be financially independent
- one spouse may have a longstanding charitable legacy plan
A marital agreement allows both people to define expectations before those issues become disputes.
A Marital Agreement Does Not Prevent You From Leaving Property to Your Spouse
Waiving certain legal rights does not necessarily mean your spouse receives nothing.
A marital agreement can establish the legal baseline while still allowing either spouse to voluntarily provide for the other through a will, trust, beneficiary designation, or lifetime gift.
For example, a spouse may waive the right to claim part of a family business while still receiving:
- the marital home
- life insurance proceeds
- retirement benefits
- trust income
- a specific cash gift
- other property under the estate plan
This is one reason marital agreements and estate planning documents should be coordinated rather than drafted independently.
When Should You Consider a Marital Agreement?
A prenuptial or postnuptial agreement may deserve serious consideration if:
- you are marrying or remarrying with significant separate assets
- you have children from a prior relationship
- you own a closely held or family business
- you expect to receive an inheritance
- you want certain property to pass to someone other than your spouse
- you and your spouse want to keep certain finances separate
- either spouse has significant individual debt
- you want greater certainty about financial rights if the marriage ends
- you have a specific charitable or legacy planning goal
The more complicated the family or financial picture, the more important it becomes to coordinate these documents carefully.
Prenups, Wills, and Trusts Are Not Competitors
The easiest way to understand the relationship is this:
A will or trust says what you want to happen to your property.
A marital agreement helps define what property rights each spouse has before those wishes are carried out.
One does not automatically replace the other.
For many couples—especially those entering a remarriage, blending families, or bringing significant individual assets into a marriage—the strongest plan may involve both.
Make the Documents Work Together
A thoughtfully designed estate plan should coordinate your will, trust, beneficiary designations, property ownership, and any prenuptial or postnuptial agreement.
If those documents contradict one another, the result can be uncertainty, litigation, or an inheritance that looks very different from what you intended. If you are planning to marry or remarry, or already have a marital agreement that has not been reviewed alongside your estate plan, we can help you understand how the documents interact and create a coordinated plan that protects your spouse, your beneficiaries, and your legacy.
