What Is a Joint Will and Should You Have One?

Married couples often share everything, including a will. But a joint will comes with surprising risks that most people never consider before it is too late to change anything.

A joint will is a single legal document signed by two people, usually a married couple, that outlines how their combined assets will be distributed after both have died. It functions like a standard last will and testament, but it is created and signed by two individuals instead of one. Both parties agree to the same set of instructions, and those instructions are intended to bind both estates.

Joint wills were once a popular choice for spouses who wanted to ensure their assets passed to each other and then to their children without dispute. Today, estate planning professionals generally caution against them due to their inflexibility and legal complications. Understanding how a joint will works, and where it falls short, is essential before you decide how to protect your estate. Here are five key things everyone should know about joint wills.

1. A Joint Will Locks Both Spouses Into the Same Plan Forever

The defining feature of a joint will is that it becomes irrevocable after the first spouse dies. When the first person passes away, the surviving spouse loses the legal right to change the will. The document becomes permanently binding and cannot be altered, even if the survivor remarries, has additional children, or faces dramatically different financial circumstances. Courts in most states have upheld this restriction, meaning the surviving spouse is legally prohibited from making new estate decisions that differ from what was agreed upon years or even decades earlier.

2. Joint Wills Differ From Mirror Wills in Important Ways

Many people confuse joint wills with mirror wills, but these are two very different documents. Understanding the difference helps you make a smarter choice for your family.

• Joint will: One single document signed by both spouses, legally binding on both estates, and irrevocable after the first death.
• Mirror will: Two separate but nearly identical documents, each signed independently by one spouse, that can be updated or revoked at any time by either party.
• Mutual will: A variation where two separate wills are created with a formal agreement that neither person will revoke or change theirs without the other's consent.

3. Joint Wills Can Create Serious Problems After Remarriage

Remarriage is one of the most common reasons a joint will becomes a serious legal problem. The surviving spouse may wish to update their estate plan to include a new partner, stepchildren, or revised financial goals. The joint will prevents this entirely. Assets that the surviving spouse later acquires, or wishes to redirect, may still be governed by the original document's instructions. This situation can trigger family disputes, lengthy probate battles, and outcomes that no one in the family actually wanted. The surviving spouse may feel completely trapped by promises made in a very different season of life.

4. State Laws Treat Joint Wills Differently Across the Country

State law plays a major role in how a joint will is interpreted and enforced. Some states treat a joint will as a binding contract between the two signers, making it enforceable as both a will and a legal agreement. Other states apply different standards or have limited case law on the subject, creating real uncertainty about how a court will rule. This inconsistency makes joint wills especially risky for people who move to a different state after the first spouse dies. An estate plan built on a joint will may face costly legal challenges simply because of where the surviving spouse chooses to live.

5. Separate Individual Wills Offer More Protection and Flexibility

Estate planning professionals consistently recommend that each spouse create their own individual will rather than relying on a joint document. Individual wills allow each person to account for their unique assets, personal wishes, and family relationships. They can be updated whenever life changes, such as after the birth of a grandchild, a divorce, a new business, or a shift in financial priorities. Separate wills also move more smoothly through the probate process and are easier for courts to interpret. Each spouse retains full control over their own estate decisions for as long as they are living.

The Big Question: Should You Use a Joint Will?

For most married couples, a joint will is not the best choice. The inflexibility, legal risk, and potential for family conflict far outweigh the simplicity of using a single document. Creating two individual wills, one for each spouse, gives both parties far greater protection without sacrificing the ability to leave assets to each other and to your children. An attorney may charge $1,000 or more to draft wills for a couple, but that level of expense is not necessary to get legally valid documents that truly work.

BudgetWills.com makes it simple to create a legally valid, state-specific will for just $49.95. You can complete your will from home in minutes, download it instantly, and have peace of mind knowing your wishes are protected. Visit BudgetWills.com today, choose your state, and take the most important step your family deserves.