Will and testament

Required content varies, depending on the jurisdiction, but generally includes the following:

• The testator must clearly identify themselves as the maker of the will, and that a will is being made; this is commonly called "publication" of the will, and is typically satisfied by the words "last will and testament" on the face of the document.
• The testator should declare that he or she revokes all previous wills and codicils. Otherwise, a subsequent will revokes earlier wills and codicils only to the extent to which they are inconsistent. However, if a subsequent will is completely inconsistent with an earlier one, the earlier will is considered completely revoked by implication.
• The testator may demonstrate that he or she has the capacity to dispose of their property ("sound mind"), and does so freely and willingly.
• The testator must sign and date the will, usually in the presence of at least two disinterested witnesses (persons who are not beneficiaries). There may be extra witnesses, these are called "supernumerary" witnesses, if there is a question as to an interested-party conflict. Some jurisdictions, notably Pennsylvania, have long abolished any requirement for witnesses. In the United States, Louisiana requires both attestation by two witnesses as well as notarization by a notary public. Holographic wills generally require no witnesses to be valid, but depending on the jurisdiction may need to be proved later as to the authenticity of the testator's signature.
• If witnesses are designated to receive property under the will they are witnesses to, this has the effect, in many jurisdictions, of either (i) disallowing them to receive under the will, or (ii) invalidating their status as a witness. In a growing number of states in the United States, however, an interested party is only an improper witness as to the clauses that benefit him or her (for instance, in Illinois).
• The testator's signature must be placed at the end of the will. If this is not observed, any text following the signature will be ignored, or the entire will may be invalidated if what comes after the signature is so material that ignoring it would defeat the testator's intentions.
• One or more beneficiaries (devisees, legatees) must generally be clearly stated in the text, but some jurisdictions allow a valid will that merely revokes a previous will, revokes a disposition in a previous will, or names an executor.

A will may not include a requirement that an heir commit an illegal, immoral, or other act against public policy as a condition of receipt.

In community property jurisdictions, a will cannot be used to disinherit a surviving spouse, who is entitled to at least a portion of the testator's estate. In the United States, children may be disinherited by a parent's will, except in Louisiana, where a minimum share is guaranteed to surviving children except in specifically enumerated circumstances.[10] Many civil law countries follow a similar rule. In England and Wales from 1933 to 1975, a will could disinherit a spouse; however, since the Inheritance (Provision for Family and Dependants) Act 1975 such an attempt can be defeated by a court order if it leaves the surviving spouse (or other entitled dependent) without "reasonable financial provision".

There is no legal requirement that a will be drawn up by a lawyer, and some people may resist hiring a lawyer to draft a will.[11] People may draft a will with the assistance of a lawyer, use a software product[12] or will form, or write their wishes entirely on their own. Some lawyers offer educational classes for people who want to write their own will.[13]

When obtained from a lawyer, a will may come as part of an estate planning package that includes other instruments, such as a living trust.[14] A will that is drafted by a lawyer avoid possible technical mistakes that a layperson might make that could potentially invalidate part or all of a will.[15] While wills prepared by a lawyer may seem similar to each other, lawyers can customize the language of wills to meet the needs of specific clients.[16]

In 1973 an international convention, the Convention providing a Uniform Law on the Form of an International Will,[17] was concluded in the context of UNIDROIT. The Convention provided for a universally recognised code of rules under which a will made anywhere, by any person of any nationality, would be valid and enforceable in every country that became a party to the Convention. These are known as "international wills". It is in force in Australia, Belgium, Bosnia-Herzegovina, Canada (in 9 provinces, not Quebec), Croatia, Cyprus, Ecuador, France, Italy, Libya, Niger, Portugal and Slovenia. The Holy See, Iran, Laos, the Russian Federation, Sierra Leone, the United Kingdom, and the United States have signed but not ratified.[18] International wills are only valid where the convention applies. Although the U.S. has not ratified on behalf of any state, the Uniform law has been enacted in 23 states and the District of Columbia.

For individuals who own assets in multiple countries and at least one of those countries are not a part of the Convention, it may be appropriate for the person to have multiple wills, one for each country.[18][19] In some nations, multiple wills may be useful to reduce or avoid taxes upon the estate and its assets.[20] Care must be taken to avoid accidental revocation of prior wills, conflicts between the wills, to anticipate jurisdictional and choice of law issues that may arise during probate.[19]

Intentional physical destruction of a will by the testator will revoke it, through deliberately burning or tearing the physical document itself, or by striking out the signature. In most jurisdictions, partial revocation is allowed if only part of the text or a particular provision is crossed out. Other jurisdictions will either ignore the attempt or hold that the entire will was actually revoked. A testator may also be able to revoke by the physical act of another (as would be necessary if he or she is physically incapacitated), if this is done in their presence and in the presence of witnesses. Some jurisdictions may presume that a will has been destroyed if it had been last seen in the possession of the testator but is found mutilated or cannot be found after their death.

A will may also be revoked by the execution of a new will. Most wills contain stock language that expressly revokes any wills that came before them, because otherwise a court will normally still attempt to read the wills together to the extent they are consistent.

In some jurisdictions, the complete revocation of a will automatically revives the next-most recent will, while others hold that revocation leaves the testator with no will, so that their heirs will instead inherit by intestate succession.

In England and Wales, marriage will automatically revoke a will, for it is presumed that upon marriage a testator will want to review the will. A statement in a will that it is made in contemplation of forthcoming marriage to a named person will override this.

Divorce, conversely, will not revoke a will, but in many jurisdictions will have the effect that the former spouse is treated as if they had died before the testator and so will not benefit.

Where a will has been accidentally destroyed, on evidence that this is the case, a copy will or draft will may be admitted to probate.

Many jurisdictions exercise an equitable doctrine known as "dependent relative revocation" ("DRR"). Under this doctrine, courts may disregard a revocation that was based on a mistake of law on the part of the testator as to the effect of the revocation. For example, if a testator mistakenly believes that an earlier will can be revived by the revocation of a later will, the court will ignore the later revocation if the later will comes closer to fulfilling the testator's intent than not having a will at all. The doctrine also applies when a testator executes a second, or new will and revokes their old will under the (mistaken) belief that the new will would be valid. However, if for some reason the new will is not valid, a court may apply the doctrine to reinstate and probate the old will, if the court holds that the testator would prefer the old will to intestate succession.

Before applying the doctrine, courts may require (with rare exceptions) that there have been an alternative plan of disposition of the property. That is, after revoking the prior will, the testator could have made an alternative plan of disposition. Such a plan would show that the testator intended the revocation to result in the property going elsewhere, rather than just being a revoked disposition. Secondly, courts require either that the testator have recited their mistake in the terms of the revoking instrument, or that the mistake be established by clear and convincing evidence. For example, when the testator made the original revocation, he must have erroneously noted that he was revoking the gift "because the intended recipient has died" or "because I will enact a new will tomorrow".

DRR may be applied to restore a gift erroneously struck from a will if the intent of the testator was to enlarge that gift, but will not apply to restore such a gift if the intent of the testator was to revoke the gift in favor of another person. For example, suppose Tom has a will that bequeaths $5,000 to his secretary, Alice Johnson. If Tom crosses out that clause and writes "$7,000 to Alice Johnson" in the margin, but does not sign or date the writing in the margin, most states would find that Tom had revoked the earlier provision, but had not effectively amended his will to add the second; however, under DRR the revocation would be undone because Tom was acting under the mistaken belief that he could increase the gift to $7,000 by writing that in the margin. Therefore, Alice will get 5,000 dollars. However, the doctrine of relative revocation will not apply if the interlineation decreases the amount of the gift from the original provision (e.g., "$5,000 to Alice Johnson" is crossed out and replaced with "$3,000 to Alice Johnson" without Testator's signature or the date in the margin; DRR does not apply and Alice Johnson will take nothing).

Similarly, if Tom crosses out that clause and writes in the margin "$5,000 to Betty Smith" without signing or dating the writing, the gift to Alice will be effectively revoked. In this case, it will not be restored under the doctrine of DRR because even though Tom was mistaken about the effectiveness of the gift to Betty, that mistake does not affect Tom's intent to revoke the gift to Alice. Because the gift to Betty will be invalid for lack of proper execution, that $5,000 will go to Tom's residuary estate.

Also referred to as "electing to take against the will". In the United States, many states have probate statutes that permit the surviving spouse of the decedent to choose to receive a particular share of deceased spouse's estate in lieu of receiving the specified share left to him or her under the deceased spouse's will. As a simple example, under Iowa law (see Code of Iowa Section 633.238 (2005)), the deceased spouse leaves a will which expressly devises the marital home to someone other than the surviving spouse. The surviving spouse may elect, contrary to the intent of the will, to live in the home for the remainder of his/her lifetime. This is called a "life estate" and terminates immediately upon the surviving spouse's death.

The historical and social policy purposes of such statutes are to assure that the surviving spouse receives a statutorily set minimum amount of property from the decedent. Historically, these statutes were enacted to prevent the deceased spouse from leaving the survivor destitute, thereby shifting the burden of care to the social welfare system.

In New York, a surviving spouse is entitled to one-third of her deceased spouse's estate. The decedent's debts, administrative expenses and reasonable funeral expenses are paid prior to the calculation of the spousal elective share. The elective share is calculated through the "net estate". The net estate is inclusive of property that passed by the laws of intestacy, testamentary property, and testamentary substitutes, as enumerated in EPTL 5-1.1-A. New York's classification of testamentary substitutes that are included in the net estate make it challenging for a deceased spouse to disinherit their surviving spouse.