How to Write a Will

What is a will and why does it matter?

A will (last will and testament) is a legal document that says who should receive your property after you die and who should manage your estate. It can also name a guardian for minor children. Wills are among the most formal documents in everyday law: courts enforce them only if they meet strict requirements, because the person who wrote the will can no longer explain what they meant.

Formalities serve several purposes. They show that the writer meant the document to be final (not a draft or letter), protect against fraud and undue influence, and create reliable evidence. The tension is that strict rules sometimes defeat the clear wishes of people who made small mistakes.

Requirements for a valid will in the U.S.

• Capacity: the testator must generally be at least 18 and of sound mind, meaning they understand the nature of their property, the people who would naturally inherit, and what the will does.
• Intent: the document must be meant to take effect as a will.
• Writing: oral wills are rarely valid.
• Signature: the testator signs, usually at the end.
• Witnesses: most states require two witnesses who see the signing or the testator's acknowledgment and sign themselves. Using witnesses who don't inherit under the will avoids conflicts.

Many states allow a self-proving affidavit, signed by the testator and witnesses before a notary, so witnesses don't have to testify later. Roughly half the states also accept holographic wills: wills written and signed in the testator's own handwriting, usually without witnesses. A growing number of states have adopted the Uniform Electronic Wills Act, allowing wills signed and witnessed electronically.

A will doesn't need legal jargon to be valid. It needs clear intent, the right signatures, and a process that shows nobody forced the writer's hand.

When things go wrong: contests and mistakes

Wills are challenged on a few common grounds: lack of capacity, undue influence (someone in a position of trust overpowered the testator's free will), fraud, forgery, or improper execution. Courts presume capacity, so challengers carry a heavy burden. A famous example is the so-called "Mormon will" said to have been left by Howard Hughes, which a Nevada jury rejected in 1978.

Traditional law required strict compliance with formalities. The Uniform Probate Code softened this with a "harmless error" rule (§ 2-503): a court may treat a document as a valid will if there's clear and convincing evidence the person intended it to be one, even if a formality was missed. Several states have adopted this approach.

The right to pass on property has constitutional weight too. In Hodel v. Irving (1987), the Supreme Court struck down a federal law that completely abolished the ability to pass small fractional interests in Native American land at death, holding that it was a taking without just compensation.

Probate, intestacy and protected heirs

Probate is the court process that validates a will, appoints an executor, pays debts and taxes, and distributes what's left. It can be slow and public, which is why many people use revocable living trusts, beneficiary designations on retirement accounts and life insurance, and joint ownership to pass assets outside probate.

If someone dies without a valid will, state intestacy laws decide the heirs, typically the surviving spouse and children first, then parents, siblings and more distant relatives. Most states also protect spouses from being completely disinherited through an elective share, often around one-third of the estate, or through community property rules, discussed in marriage law in the U.S.. Children, by contrast, can generally be disinherited in the U.S. if the will makes that intent clear, except for children born after the will was made, who may get "pretermitted heir" protection.

Families sometimes face scams around estate planning, such as overpriced "trust mills." General protections against unfair sales practices are covered in consumer protection law, and the probate process itself must follow due process, including notice to heirs.

Korea's will rules

Korea takes a stricter approach. Under the Civil Act, a will is valid only if it follows the form the law prescribes (art. 1060), and anyone 17 or older with capacity can make one (art. 1061). There are five forms (art. 1065):

• Holographic will (자필증서): the testator handwrites the full text, date, address and name, and affixes a seal (art. 1066).
• Recorded will (녹음): the testator states the will, name and date on a recording, and a witness confirms it (art. 1067).
• Notarized will (공정증서): the testator dictates to a notary in front of two witnesses (art. 1068).
• Sealed will (비밀증서): a sealed document presented to two or more witnesses, with the envelope dated and later certified (art. 1069).
• Oral will in emergency (구수증서): only when other forms are impossible because of illness or emergency, with court confirmation (art. 1070).

Korean courts apply these formalities strictly. Handwritten wills missing the address, date or seal have repeatedly been held void, even when the testator's wishes were clear. That's why notarized wills are popular despite their cost.

Korea's forced share and the comparison

Korea also protects close family through the forced share (유류분, art. 1112 and following), a minimum portion that descendants, spouses and parents can claim even against a will. In 2024 the Constitutional Court held the forced share for siblings unconstitutional and found that the law must be revised to deal with heirs who had seriously mistreated the deceased.

Both systems balance two values: the freedom to decide where your property goes and the duty to the people you leave behind. A will is where those values meet on a single page.

What makes a will legally valid in the U.S.?

Generally an adult of sound mind, a written document, the testator's signature, and two witnesses, though about half the states also accept handwritten wills without witnesses.

Do I need a lawyer to write a will?

Not legally, but mistakes in execution can void a will, so complex estates usually benefit from professional help.

What happens if I die without a will?

State intestacy law decides who inherits, usually starting with the surviving spouse and children.

What forms of will does Korean law allow?

Five: holographic, recorded, notarized, sealed, and an emergency oral will confirmed by a court.

References and official sources

1. Will, Wex. Cornell LII
2. Probate, Wex. Cornell LII
3. Intestate succession, Wex. Cornell LII
4. Hodel v. Irving, 481 U.S. 704 (1987). Justia
5. 민법. 국가법령정보센터