What a will actually does, and what it cannot do

Most people think of a will as the document that determines what happens to everything they own. It is more limited than that, and understanding the boundaries is the difference between a plan that works and one that produces a mess.

I am not your lawyer and this is not legal advice. Rules differ substantially between countries and, in federal systems, between states or provinces. What follows is a general orientation, and the specifics for your situation need someone qualified where you live.

What a will typically does

Names an executor — the person responsible for administering the estate. Terminology varies; personal representative, administrator and executor all appear depending on jurisdiction.

Directs distribution of assets that form part of the estate.

Names guardians for minor children, which in many jurisdictions is among the most important functions and the one most often cited as the reason young parents finally make a will.

Can create trusts that come into effect on death.

Can express wishes about funeral arrangements, though in most systems these are not binding.

What passes outside the will

This is the part that surprises people.

Assets with a named beneficiary. Life insurance, and in many jurisdictions pensions and certain retirement accounts, pass to whoever is named on the beneficiary designation. That designation generally overrides the will.

Which means an out-of-date beneficiary form can direct a substantial sum to a former partner regardless of what the will says. This is a common and entirely avoidable problem, and reviewing beneficiary designations after any major life change is one of the highest-value things on this site.

Jointly owned property, depending on how it is held. Property held in a form carrying survivorship rights typically passes automatically to the surviving owner outside the estate. Property held as a shared interest without survivorship may form part of the estate.

The distinction is technical, jurisdiction-specific, and consequential. If you own property jointly and do not know which form applies, that is worth finding out.

Assets in certain trusts, which are owned by the trust rather than by the individual.

In some jurisdictions, community or matrimonial property rules restrict what can be freely given away.

The limits on what you can direct

Testamentary freedom — the ability to leave your property to whomever you choose — varies enormously between legal systems.

Forced heirship exists in many civil law countries, reserving a defined portion of the estate for children and sometimes a spouse. In these systems a will cannot disinherit a child beyond the permitted portion.

Family provision claims exist in many common law jurisdictions, allowing certain people — typically spouses, children and dependants — to apply to a court for provision if the will leaves them inadequately provided for.

Which means that in most of the world, you cannot simply leave everything to a cat sanctuary and expect it to hold, if there are people who were dependent on you.

Spousal entitlements exist in many systems and may override will provisions.

Formalities matter

Wills are among the most formality-dependent documents in law, and a will that fails the formal requirements may be invalid entirely.

Requirements typically involve some combination of writing, signature, and witnesses. Numbers of witnesses, who may witness, and whether they must be present simultaneously vary by jurisdiction.

The witness trap. In many jurisdictions, a beneficiary who witnesses the will loses their gift, or the gift is void, while the will itself stands. This catches people constantly — the obvious person to ask to witness is a family member, and that is exactly the person who should not.

Use witnesses who are not beneficiaries and not married to beneficiaries.

Holographic wills — entirely handwritten and unwitnessed — are valid in some jurisdictions and not others. Do not rely on one without checking.

The document has to be findable

A perfectly drafted will that nobody can locate does nothing.

Tell your executor where it is. Some jurisdictions have registration or deposit schemes; use one if available. Avoid a safe deposit box that cannot be opened without the authority the will itself confers, which is a genuine circularity that occurs.

Keep the original. Copies are frequently insufficient, and in some jurisdictions a missing original raises a presumption that it was deliberately destroyed.

When to review it

Marriage, which in some jurisdictions revokes an existing will automatically. Divorce, which may partially revoke provisions relating to a former spouse, in ways that differ by jurisdiction. Birth or adoption of children. Death of a beneficiary or executor. Significant change in assets. Moving to a different country or state.

That last one matters more than people expect. A will valid where it was made may not operate as intended elsewhere, and cross-border estates are genuinely complicated.

The practical starting point

If you have children, property, or anyone who depends on you, and you do not have a will, that is the gap worth closing first.

Professionally drafted is generally worth the cost. Home-made and template wills are valid in principle and they are where most of the disputes come from, because small ambiguities in wording produce large arguments later.

This is general information, not legal advice, and the law differs by jurisdiction. Consult a qualified solicitor, attorney or notary where you live.