What Is a Will? How a Last Will and Testament Works

What a Will Actually Does (and Doesn't Do)

A will is a written instruction set for the people and courts that handle your estate. At its core, it answers three questions: Who gets what? Who raises the children? Who is in charge?

The person who writes a will is called the testator. The person named to carry out the will's instructions is the executor (also called a personal representative). The people who receive assets under the will are beneficiaries.

A will can name a guardian for minor children — this is one of its most important functions, and something no other document can do. It can also create a testamentary trust inside the will itself, which holds and manages assets for a minor or a beneficiary who cannot manage money independently.

What a will does not do

A will does not control everything you own. Several major asset types pass outside the will entirely, regardless of what it says:

• Retirement accounts (IRAs, 401(k)s) pass directly to named beneficiaries on file with the account custodian.
• Life insurance proceeds go to the policy's named beneficiary, not through your estate.
• Payable-on-death (POD) and transfer-on-death (TOD) accounts pass directly to the named recipient.
• Jointly owned property with right of survivorship automatically transfers to the surviving owner.
• Assets held in a living trust pass according to the trust's terms, not the will.

This matters more than most people expect. If the beneficiary designation on your IRA names your ex-spouse, your will cannot override it. The beneficiary designation wins, always.

The Different Types of Wills

Not all wills are identical. The type that applies in your situation depends on how you create the document and what your state allows.

Attested will (the standard type)

An attested will is written or typed, signed by the testator, and signed by at least two witnesses who watch the testator sign. This is the most widely recognized form and is valid in every U.S. state. Most attorney-drafted wills and online will services produce attested wills.

Holographic will

A holographic will is entirely handwritten and signed by the testator — no witnesses required. About half of U.S. states recognize holographic wills. The key requirement in most states is that the will must be entirely in the testator's own handwriting. A printed form with handwritten fill-ins generally does not qualify.

Holographic wills are prone to challenges. If someone questions your mental capacity or claims you were pressured, there are no witnesses to testify on your behalf. Use an attested will when possible.

Pour-over will

A pour-over will works in tandem with a living trust. It directs any assets you owned outside the trust at death to "pour over" into the trust, where the trust's distribution instructions then apply. Most people who create a living trust also sign a pour-over will as a safety net. It still goes through probate for the assets it catches, but it keeps everything under one unified plan.

Testamentary trust will

This type of will creates a trust inside the will itself — the trust only comes into existence at death. It is useful when you want to leave assets to a minor child or a beneficiary who needs managed distributions over time, but you do not want (or need) the full complexity of a separate living trust.

Oral (nuncupative) will

A small number of states allow oral wills made in front of witnesses, typically only in narrow circumstances such as imminent death on active military service. Oral wills are rarely enforced and generally cover only personal property, not real estate. Do not rely on one.

What Happens to Assets That Don't Go Through a Will

A significant portion of most people's wealth transfers at death without touching the will at all. Understanding this category prevents one of the most common estate planning mistakes: assuming your will controls everything.

The practical implication: review your beneficiary designations whenever you review your will. Many people update their will after a divorce, remarriage, or death in the family — and forget to update the beneficiary forms on their retirement accounts. Those outdated designations override the will every time.

The executor named in your will has the authority to manage probate assets. For the full picture of what they must do, see our executor checklist — a step-by-step breakdown of every task from filing the will to closing the estate.

How to Make a Will That Holds Up Legally

Making a will that courts will honor requires meeting your state's formal requirements. These vary, but the core rules are consistent across most jurisdictions.

Basic legal requirements in most U.S. states

• Age. You must be at least 18 years old (some states allow minors who are married or in the military).
• Mental capacity. You must be of sound mind — meaning you understand what a will is, what property you own, who your natural heirs are, and what the will does.
• Writing. The will must be in writing. Oral wills are only valid in extremely narrow circumstances.
• Signature. You must sign the will yourself, or direct another person to sign it in your presence if you are physically unable.
• Witnesses. Most states require two adult witnesses to watch you sign and then sign themselves. Witnesses should not be beneficiaries under the will — in some states, a beneficiary-witness can void their own bequest or even the entire will.

Should you use an attorney or an online service?

For a straightforward estate — a couple with young children, a single person with clear wishes, no business interests, no blended family complications — an online will service like Trust & Will or LegalZoom can produce a legally valid document for $100–$200. The documents meet state requirements and walk you through every decision.

An estate planning attorney is worth the $300–$600 cost when your situation involves real estate in multiple states, a blended family, a beneficiary with special needs, significant assets, or any dispute risk. The attorney also ensures the will is properly executed — a step that catches more errors than people expect.

What to do after you sign

Store the original will somewhere accessible — not a bank safe deposit box, which can be sealed at death. A fireproof home safe or your attorney's office works well. Tell your executor where it is. Keep digital copies for reference, but probate courts typically require the original signed document.

Review and update your will after any major life change: marriage, divorce, birth of a child, death of a beneficiary or named executor, significant change in assets, or a move to a different state.

Will vs. Trust: Which One Do You Need?

The will versus trust question comes up in almost every estate planning conversation. The short answer: they do different things, and most people need both.

A will alone is sufficient if your estate is small, you have no real estate, and all your major accounts already have named beneficiaries. A living trust adds value when you own real estate, have a larger estate, want to avoid probate's time and cost, or need to plan for incapacity. Most people with a trust still sign a pour-over will alongside it.

For a deeper look at what happens when you have neither — and the process of administering an estate without prior planning — our guide to settling an estate walks through every stage of estate administration.

What Happens to Your Will When You Die

A will does nothing on its own. It requires a process — probate — to give it legal effect. Here is what that looks like in practice.

Step 1: The executor locates and files the will

The executor named in your will has the legal duty to locate the original document and file it with the probate court in the county where you lived. Most states require this within 30–90 days of death. The court reviews the will for validity and issues "letters testamentary" — the official document that gives the executor authority to act on behalf of the estate.

Step 2: The estate is inventoried and debts paid

The executor identifies all probate assets, has them appraised if necessary, notifies creditors, and pays valid debts, taxes, and expenses. Creditors typically have 3–12 months to submit claims, depending on the state.

Step 3: Assets are distributed to beneficiaries

Once debts are settled, the executor distributes the remaining assets to the beneficiaries named in the will. The court then closes the estate. The entire process takes 6–18 months in straightforward cases; contested estates can take years.

The probate process has its own timeline and costs that vary significantly by state. Some states have simplified procedures for smaller estates that reduce the time and expense considerably.

Common Will Mistakes — and How to Avoid Them

A will that fails — because of a technical error, an outdated provision, or a missing signature — can be almost as harmful as having no will at all. These are the mistakes that show up most often.

Mistake 1: Not signing the will correctly

Many wills are invalidated not because of what they say, but because of how they were signed. A will signed without the required witnesses, signed by a beneficiary who also witnessed it, or signed in the wrong order can be voided by a court. Always execute the will in one sitting, with both witnesses present, and complete a self-proving affidavit in front of a notary if your state allows it.

Mistake 2: Failing to update after life changes

A will written before a divorce often still names the ex-spouse as beneficiary or executor. A will written before a second marriage may omit the new spouse entirely, triggering a "pretermitted spouse" claim under state law. After any major life event — marriage, divorce, birth, death, or a large change in assets — review the will and update it.

Mistake 3: Naming only one executor or guardian

Executors and guardians sometimes predecease the testator or become unable to serve. Always name a primary and at least one alternate for each role. If no willing, qualified executor exists when you die, the court appoints one — which removes the choice from your family entirely.

Mistake 4: Overlooking the beneficiary designation problem

As noted above, the beneficiary designations on retirement accounts and life insurance override the will. A testator who leaves everything to their children in the will but never updated their 401(k) beneficiary after a divorce may unintentionally leave the retirement account to an ex-spouse. Treat beneficiary designations as part of your will review, not a separate task.

Mistake 5: Leaving the will impossible to find

A will stored in a sealed safe deposit box can be inaccessible at the worst moment. Courts require the original document. Store it where your executor can find it — a fireproof safe at home, with your attorney, or through an official will registry if your state offers one. Tell your executor where it is, in writing.

Mistake 6: Using a will to handle non-probate assets

Instructing in your will that your IRA should go to a specific person does not work. Retirement accounts pass by beneficiary designation, period. The will cannot redirect them. If your beneficiary designations are outdated, update them at the source — contact your plan administrator or insurance company directly.

Frequently Asked Questions