Letter of Instruction vs. Will: What Each One Actually Does

Most people who set out to “get their affairs in order” write a will and stop there. It feels like the responsible thing, and it is — but it leaves a large gap.

A will answers one question: who gets what. It does not tell your family where the deed is, which bank held the retirement account, whether you wanted to be cremated, or who should take the dog. Those answers live in a different document, and most families never write it.

The Difference in One Table

What a Will Cannot Do for You

A will is a legal instrument, and its scope is narrow by design. Three limitations matter in practice.

It is often read too late

Wills are typically located and read days after a death — frequently after funeral decisions have already been made. If your burial preferences are only in your will, there is a real chance nobody sees them in time. Families discover this constantly.

It becomes public

Once a will goes through probate, it is public record. Anyone can request it. That makes it the wrong place to record a safe combination, an account number, or where the spare key is hidden.

It says nothing about logistics

A will might say your daughter inherits the house. It will not say the water shutoff is behind the laundry room door, the property taxes are on autopay from a checking account she does not know exists, or that the neighbor has a spare key. That is the information she will actually need in week one.

What Belongs in a Letter of Instruction

There is no legally required format, which is exactly why most people never start one — a blank page is intimidating. Here is the structure that covers what families actually search for.

Where things physically are

• •The original will and trust documents
• •Property deeds and vehicle titles
• •The safe, and its combination or key location
• •Safe deposit box — which bank, which box, where the key is
• •Insurance policies and birth certificates

Accounts and access

• •Which institutions hold which accounts
• •Where your password manager or password list lives
• •Guidance for unlocking your phone and computer
• •Subscriptions and recurring charges that will need cancelling

Medical and end-of-life wishes

• •Who your healthcare proxy is, and where the signed directive is kept
• •Care preferences if you cannot speak for yourself
• •Medication allergies and anything doctors should know

Funeral and memorial preferences

• •Burial or cremation
• •Any prepaid arrangements, and where that paperwork is
• •Service preferences — and anything you specifically do not want

Care of dependents and pets

• •Daily routines, medical needs, and school or care contacts
• •Who you would want to step in, and why
• •Veterinarian, feeding schedule, medications, and any care funds set aside

People to notify

Friends, employer or business partners, faith community, and professionals your family would not otherwise know to call.

Messages to specific people

Things you want said, named clearly enough that the right message reaches the right person. For many families this ends up being the part that matters most.

The Problem Nobody Talks About

Suppose you write all of this down. You put it in a drawer, or a Word document, or a shared folder. Then something happens.

Here is the uncomfortable question: what stops someone from changing it?

A printed letter can be replaced. A document file can be edited, with the modification date quietly overwritten. If two family members disagree about what you wanted, and the only record is a file anyone could have altered, there is no way to establish what you actually wrote.

This is not a hypothetical concern. Disputes over informal instructions are common precisely because informal documents carry no proof of authorship or integrity. The people most likely to be hurt are the ones with the least standing to argue.

What a Tamper-Proof Version Looks Like

The fix is a record that cannot be silently changed. In practice that means three properties:

• •Append-only history. Editing never overwrites. Each save creates a new version, and every previous version remains permanently.
• •Cryptographic chaining. Each version carries a fingerprint of its own content plus the previous version's fingerprint. Altering any version breaks the chain in a way that is mathematically detectable — even for someone with direct database access.
• •A permanent lock. Once a designated executor reports a death or incapacity, the record becomes read-only forever. Nobody can edit it afterward — not a family member, not the company hosting it.

With those three properties, the question “is this really what they wrote?” has a verifiable answer instead of an argument.

How Lurra Handles This

Lurra's Special Instructions feature is a letter of instruction with exactly those protections built in.

You write into ten guided sections rather than a blank page — locations, accounts, medical wishes, funeral preferences, dependents, pets, people to notify, personal messages, business obligations, and anything else. Every save requires re-entering your password, and is permanently recorded with a cryptographic fingerprint linking it to the version before it.

While you are well, it stays sealed. Your family can see that it exists, but not what it says. If a designated executor reports a death or incapacity, you are notified immediately and have 72 hours to cancel — so a mistaken or malicious report cannot lock you out of your own record. After that window, it becomes permanently read-only and your family gains access.

You can verify the integrity of the chain yourself, at any time, from inside the app.

To be explicit about the limits: Special Instructions is not a legal will. It does not override your will, trust, or beneficiary designations, and it has no legal force on its own. It is the practical companion to those documents, not a replacement for them.

Where to Keep It

Wherever you write your letter of instruction, one rule matters more than the rest: your family has to be able to reach it.

A safe deposit box is a common mistake — many are sealed on death and require a court order to open, which defeats the purpose entirely. A home safe works only if someone else knows the combination, which is exactly the kind of detail people forget to share. A file on your laptop is useless if nobody can unlock the laptop.

The most reliable option is a secure location that designated people can access when it is needed, and cannot access before then.

Frequently Asked Questions

Where to Start

If you have a will and nothing else, you have covered the legal question and left the practical one open. If you have neither, start with the letter of instruction — it costs nothing but time, and in the first weeks after a death it is the document your family reaches for most.

Set aside an afternoon. Work through the sections above. Then tell the people who would need it that it exists and how to get to it. That last step is the one people skip, and it is the one that makes all the rest count.