Joint Wills vs Mutual Wills: The Difference That Decides Whether Your Spouse Can Ever Change It
Married couples often want the same basic outcome from estate planning. Everything goes to the surviving spouse first, then to the children after both spouses die.
That shared goal can make one will for both spouses sound convenient. But what is a joint will, and does combining both spouses’ wishes into one document actually make sense?
A joint will is generally one document created and signed by two people, usually spouses. It states how their property should be distributed after one or both spouses die.
The simplicity can be appealing. The potential problem is that life rarely stays as simple as the document expects.
For many couples, separate wills provide greater flexibility when families, finances, and relationships change.
You and your spouse may agree completely on what should happen to your estate. Everything goes to the surviving spouse first, and when the second spouse dies, whatever remains passes to the children. It sounds simple when both spouses are alive and making the decision together. The harder question is what happens after one spouse dies.
If you die first and your spouse lives another 20 years, circumstances can change considerably. Your spouse could remarry, become estranged from one of your children, sell the family home, acquire new property, or simply decide that the estate should be divided differently.
This is where the distinction between joint wills and mutual wills becomes important. For Michigan couples, however, there is another critical issue to understand: signing wills with matching terms does not automatically make those terms permanently binding.
What Is a Joint Will?
A joint will is one will signed by two people, usually spouses. Instead of each spouse signing an individual last will and testament, both spouses place their estate instructions into the same document. A typical joint will might state that John and Sarah leave their property to each other, and after both have died, the remaining estate passes equally to their three children.
At first glance, this can seem efficient because a single document appears to handle both estates. However, sharing one will is not necessarily the same as making a legally enforceable promise that the estate plan can never be changed. Under MCL 700.2514, executing a joint will does not by itself create a presumption that the spouses entered into a contract not to revoke it. The fact that two spouses signed the same estate planning document therefore does not necessarily answer the larger question of whether the surviving spouse can change the plan later. That may depend on whether an enforceable contract concerning succession exists.
What Are Mutual Wills?
Mutual wills generally involve two people making separate wills as part of an arrangement concerning how their estates will ultimately be distributed. Imagine David and Maria both have children from previous marriages. They agree that after the first spouse dies, the survivor can benefit from the estate. Once the surviving spouse dies, the remaining assets are to be divided between David’s children and Maria’s children according to the arrangement they made.
Each spouse may sign a separate will reflecting those intentions. The important issue, however, is not simply that the two wills contain similar provisions. The potentially significant feature is the agreement behind them. This is why joint wills and mutual wills are sometimes confused. A joint will generally describes the structure of the testamentary document, while mutual wills may involve an agreement between the people making them. Even then, Michigan law does not presume merely from the execution of mutual wills that a contract not to revoke them exists.
Joint Wills vs Mutual Wills: The Difference That Actually Matters in Michigan
The distinction becomes easier to understand when the two approaches are compared directly.
Joint Will | Mutual Wills | |
Number of documents | Usually one | Usually two |
Who signs? | Both spouses | Each spouse signs their own |
Terms may be similar | Yes | Yes |
Automatically creates a contract not to revoke in Michigan? | No | No |
Can involve a binding agreement? | Potentially | Potentially |
Survivor’s ability to change the plan | Depends on the documents and any enforceable agreement | Depends on the documents and any enforceable agreement |
The final distinction is particularly important. Michigan’s Estates and Protected Individuals Code states that executing a joint will or mutual wills does not create a presumption of a contract not to revoke the will or wills. In practical terms, the question is not simply whether a couple created a joint will or signed similar wills. The more important question is whether they entered into an enforceable agreement restricting future changes to their estate plan. That distinction can become extremely important years after the first spouse dies.
Can Your Spouse Change the Will After You Die?
Potentially, yes. Many couples assume that matching estate plans guarantee that the beneficiaries they choose together will eventually receive the estate. That assumption can become problematic when circumstances change after the first spouse’s death.
Suppose you and your spouse agree that the estate will eventually pass equally to your three children. You die first, and several years later your spouse remarries. Depending on how the estate plan and assets are structured, the surviving spouse may be able to create a new estate plan that changes where assets under their control ultimately go. A new spouse could receive more, one child could receive less, or the beneficiaries could change entirely. Whether those changes are legally permissible depends on the documents, the ownership of the assets, and whether an enforceable contractual restriction exists.
That is why a Joint Will Attorney in Michigan should look beyond whether spouses simply want matching instructions. An effective estate plan should also address how much flexibility the surviving spouse should have after the first death and whether there are beneficiaries or distributions the couple specifically wants protected.
When Does Michigan Recognize a Contract Concerning a Will?
Michigan law provides specific rules for contracts involving succession. Under MCL 700.2514, for arrangements executed after July 1, 1979, a contract to make a will or devise, not to revoke a will or devise, or to die intestate may be established in specified ways. These include provisions in a will stating the material provisions of the contract, an express reference in a will to a contract together with outside evidence proving its terms, or a writing signed by the decedent that evidences the contract.
This is one of the most important points in understanding joint wills and mutual wills in Michigan. Two wills can contain nearly identical provisions without necessarily proving that the spouses made an enforceable promise never to change them. Couples who specifically intend to restrict future changes therefore need more than an assumption that matching language will accomplish that goal. The arrangement must be documented in a manner that satisfies Michigan law.
Why This Matters for Blended Families
The distinction can be particularly important for blended families. Imagine Mark has two children from his first marriage, while his wife, Lisa, has two children from a previous marriage. They want the surviving spouse to remain financially secure, but they also want the remaining estate divided among all four children after the survivor dies.
If Mark dies first, Lisa could live for decades afterward. Her relationship with Mark’s children might change, she could remarry, or her financial circumstances could look completely different. Suppose she eventually changes her estate plan and leaves the remaining property entirely to her own children. Whether she was legally entitled to make that change cannot be determined merely by saying Mark and Lisa had “matching wills.” Their documents and any enforceable agreement concerning succession would need to be examined to determine what restrictions, if any, survived Mark’s death.
This is why careful drafting matters. For blended families in particular, the estate plan should distinguish between providing financial security for the surviving spouse and protecting the inheritance the first spouse ultimately intended for their children.
Mutual Wills Are Not the Same as Mirror Wills
Another term couples frequently encounter is “mirror wills.” Mirror wills are separate wills containing substantially similar or reciprocal provisions. For example, your will might leave your estate to your spouse and then your children, while your spouse’s will leaves their estate to you and then the same children. The two documents essentially mirror one another.
Similar language, however, does not necessarily mean the spouses entered into a binding agreement preventing future changes. That distinction matters because couples often want certainty and flexibility at the same time. They want confidence that their children will eventually inherit, but they may also want the surviving spouse to adapt the estate plan if the family’s circumstances change. Those objectives are not necessarily incompatible, but they need to be addressed deliberately rather than assumed from matching language.
The Problem With Making an Estate Plan Too Difficult to Change
Preventing future changes can sound reassuring when an estate plan is first created, but circumstances can look very different 10 or 20 years later. A beneficiary could die, a child could develop a disability requiring specialized planning, the surviving spouse could remarry, or the family could acquire or sell substantial assets. Tax and estate laws can also change, while the survivor’s financial and healthcare needs may become dramatically different from what the couple anticipated when the original documents were signed.
An arrangement intended to create certainty can therefore become restrictive if it does not account for future circumstances. A Joint Will Attorney in Michigan can help couples determine whether they actually need contractual restrictions, separate wills, trusts, or another estate planning structure that better balances long-term protection with the flexibility to respond to legitimate changes.
Sometimes a Trust Can Solve the Bigger Problem
For many couples, the real objective is not necessarily to create joint or mutual wills. What they actually want is straightforward: “I want my spouse taken care of, but I also want to know that my children will eventually receive what I intended for them.” Those are two distinct estate planning goals, and a will is not always the only tool available to accomplish them.
Depending on the family’s circumstances, trusts and other estate planning tools may provide greater control over how assets are managed and ultimately distributed. A properly structured trust, for example, may allow assets to benefit a surviving spouse during their lifetime while establishing rules governing what happens to the trust property afterward. This type of planning can be particularly relevant for blended families, second marriages, substantial estates, family businesses, or couples concerned about protecting an inheritance for children from a previous relationship.
The appropriate structure depends on the family’s assets, beneficiaries, objectives, and desired level of control. The important point is that couples should choose the estate planning structure that accomplishes their actual goals rather than assuming a particular type of will automatically provides the protection they want.
So, Which One Should Michigan Couples Use?
There is no universal answer. Some couples may prefer separate revocable estate plans because they want each spouse to retain flexibility. Others may have strong reasons for creating contractual obligations concerning certain beneficiaries or distributions. Still others may find that trusts provide a more effective way to protect beneficiaries while allowing the surviving spouse to use or benefit from assets.
The important thing is not to choose joint wills and mutual wills simply because the terminology sounds reassuring. Instead, couples should begin with the result they want. Should the surviving spouse have complete freedom to change the estate plan? Are there beneficiaries who should remain protected regardless of remarriage or changing family relationships? Should the surviving spouse be able to benefit from certain assets without having unrestricted control over where those assets eventually go? Could remarriage affect what children from a previous relationship ultimately inherit? The answers to those questions should drive the estate planning strategy.
The Signature Isn’t What Makes the Promise Permanent
The biggest misconception surrounding joint wills and mutual wills is that matching estate plans automatically guarantee the same final result. In Michigan, that is not the rule. MCL 700.2514 specifically provides that executing a joint will or mutual wills does not itself create a presumption of a contract not to revoke the will or wills.
Couples therefore need to think beyond what their documents say today and consider what the surviving spouse should legally be allowed to change years from now. If you and your spouse are considering a joint estate plan, speak with a Joint Will Attorney in Michigan before signing documents intended to restrict future changes. The People’s Firm PLLC can review your family structure, assets, beneficiaries, and long-term objectives and help you create an estate plan that balances certainty with the flexibility your family may need.
Frequently Asked Questions
Are joint wills legal in Michigan?
Michigan law expressly addresses joint wills. However, signing a joint will does not by itself establish a contract preventing the arrangement from being revoked or changed. Whether restrictions exist depends on the documents and any enforceable agreement concerning succession.
Can a surviving spouse change a joint will in Michigan?
Potentially. Michigan law does not presume that executing a joint will creates a contract not to revoke it. Whether the surviving spouse can change the estate plan depends on the documents, the assets involved, and whether an enforceable agreement restricts future changes.
Are mutual wills legally binding in Michigan?
Mutual wills do not automatically create a presumption that the parties entered into a contract not to revoke them. Michigan law specifies how a contract concerning succession may be established, so the relevant documents and agreement should be reviewed before assuming that the surviving spouse is legally bound.
What is the difference between mutual wills and mirror wills?
Mirror wills are separate wills containing similar or reciprocal provisions. Mutual wills may involve an agreement concerning how the parties intend their estates to be distributed. Similar provisions alone should not be assumed to create an enforceable promise preventing future changes.
Are mutual wills better for blended families?
They may address certain concerns, but they are not the only estate planning option available. Blended families may also use trusts and other planning strategies designed to provide for the surviving spouse while protecting an intended inheritance for children.
Can my spouse leave my assets to someone else after I die?
It depends on how the assets pass at death, who owns or controls them afterward, and whether any enforceable estate planning or contractual restrictions apply. Couples concerned about protecting particular beneficiaries should structure their estate plan around that objective rather than relying solely on matching wills.
