The Case Against Joint Wills for Married Couples

What is a 'joint will'?

A joint will is a single legal document that serves as the last will and testament for two people—often a married couple. When the first spouse dies, their entire estate passes to the surviving spouse. When the second spouse dies, the estate typically goes to the couple's children.

Couples often assume a joint will is easier and cheaper than two separate wills. Unfortunately, this doesn't account for how courts and some states view these documents—or the problems they create for the surviving spouse.

What should a joint will include?

If you're considering a joint will despite its drawbacks, it's helpful to understand what these documents typically contain. A joint will must include identification of both testators (the people making the will), a clear declaration of joint intent, and a complete inventory of shared and individual assets.

The document also requires primary beneficiary designations (usually the surviving spouse), contingent beneficiaries (typically children), and appointment of an executor to manage the estate. Both spouses must sign the document, and witnesses must be present, as required by your state. Critically, a joint will includes contractual language, making it irrevocable after the first death.

While templates exist online, the rigid structure required for joint wills—combined with state-specific legality issues—makes professional legal review essential before signing. This complexity is yet another reason many attorneys recommend separate wills instead.

Joint will vs. mutual will: key differences

Many people confuse joint wills with mutual wills, but these are distinct legal arrangements with different implications for your estate plan. Understanding the difference can help you choose the right approach for your situation.

A joint will is a single document that both spouses sign together. It functions as one combined will for the couple. A mutual will, on the other hand, involves two separate documents—one for each spouse—that contain identical or complementary terms. The key feature of mutual wills is a contractual agreement between spouses not to change their wills without the other's consent.

The practical differences matter most after the first spouse dies. With a joint will, the surviving spouse is completely locked into the original terms with no flexibility whatsoever. With mutual wills, while there's still a contractual obligation to honor the agreement, the survivor maintains a separate document, and the legal situation can be more nuanced depending on state law.

Here's how these documents compare:.

• Document structure: Joint wills use one shared document; mutual wills are two separate documents with matching terms
• Revocability while both are alive: Both can typically be changed with mutual consent, though joint wills may require more formal procedures
• Flexibility for the survivor: Joint wills offer zero flexibility; mutual wills may allow limited changes depending on the contractual terms and state law
• Common use cases: Joint wills are increasingly rare; mutual wills are sometimes used when couples want assurance but still prefer separate documents

Neither option offers the flexibility of mirror wills or trusts (more on this later), but mutual wills at least give each spouse their own document while providing some assurance that wishes will be honored.

Advantages of joint wills (and why they don't outweigh the risks)

To be fair, joint wills do have some apparent advantages. They're simpler in concept—one document instead of two. Initial costs may be lower since you're paying an attorney to draft one will rather than two. Couples also find comfort knowing their spouse can't unilaterally change the estate plan after they're gone. For some, the unified document feels like a meaningful symbol of their shared commitment.

However, each of these benefits has a significant downside. The simplicity disappears when the will hits probate court and faces complications or invalidation. Any upfront cost savings evaporate when the surviving spouse needs legal help navigating an inflexible document—or worse, litigating disputes. The assurance that terms won't change becomes a burden when life circumstances demand flexibility. And that symbolic unity? You can achieve the same feeling with mirror wills that don't lock the survivor into an unchangeable contract.

Problems with joint wills

Having a joint will is problematic for many reasons:

• State legality issues. Joint wills aren't legal in some states.
• Court complications. Many probate judges don't like joint wills and often separate the will for each party or invalidate it entirely.
• Irrevocability. A joint will functions like an irrevocable contract—once the first spouse passes away, the surviving spouse cannot change it even if circumstances have changed.
• Tied-up assets. The inability to change a joint will could have assets and property tied up for years, preventing the surviving spouse from downsizing the marital home or selling it to pay for assisted living.
• Beneficiary restrictions. The surviving spouse cannot change beneficiaries, executors, or add new beneficiaries born after the will was created—meaning a new spouse and stepchildren cannot inherit assets listed in the joint will.
• No trust options. The surviving spouse can't disinherit anyone or put money in a trust for an adult child who spends money recklessly.