The One Document Every Family Needs (That Most Don't Have)

June 18, 2026

A letter of instruction is the most practical document you can leave your family — and the one most people never write. Here's what it is, what it must include, and how to create one.

A letter of instruction — sometimes called a family financial letter — is the most practical document you can leave your family, yet fewer than 1 in 5 people have one. Unlike a will, it's not a legal document, but it tells your family exactly where your accounts are, who to contact, and what to do in the first 30 days after you're gone. It takes an afternoon to create and can save your family months of confusion and financial loss.

When David's father passed away unexpectedly at 67, David thought the hard part would be the grief.

It wasn't.

The hard part was the phone calls. Trying to track down a life insurance policy his father had mentioned once, years ago, but never documented. Searching through stacks of paper mail for a bank statement that might tell him which institutions held accounts. Calling his father's employer to ask about a pension he wasn't sure existed. Wondering, weeks later, if he'd missed something — an account, a policy, a debt — that was still out there, unclaimed or unpaid.

David's father had a will. He had a financial advisor. He had done most things right. But he had never written down where everything was in one place.

That missing document cost David six months of stress, thousands in legal fees, and the nagging feeling that he'd never quite finished the job.

Why This Document Is the One Most Families Are Missing

Most people, when they think about "getting their affairs in order," think about the big legal documents: a will, a trust, a power of attorney. Those matter. But they're not what your family will reach for in the first 72 hours.

In those early days, your family won't be reading legal briefs. They'll be trying to figure out:

Which bank do I call first?
Is there a life insurance policy, and where is it?
Does the mortgage autopay, or does someone need to make a payment?
What are the login credentials for the investment account?
Is there anyone who was sending him money — or owed him money?

A will can't answer any of those questions. A letter of instruction can answer all of them.

This is the document that estate attorneys, financial planners, and probate lawyers all wish their clients had. It doesn't require a lawyer to write. It isn't filed with any court. And yet it may be the single most useful thing you can leave behind.

What a Letter of Instruction Actually Is

A letter of instruction (sometimes called a side letter, family financial letter, or personal directive) is a plain-language document you write to your family that explains your complete financial picture and gives them a roadmap for what to do if you die or become incapacitated.

It sits alongside your will — not as a legal document, but as a practical one.

It answers the questions no legal document does: where is everything, and what do I do with it?

What Most People Do Instead (And Why It Fails)

Most people don't have a letter of instruction. What they have instead is:

1. A will that lists assets but not locations. A will might say "I leave my bank accounts to my spouse." But it doesn't say which bank, what the account number is, or how to access it. Your executor still has to go find all of it.

2. A vague sense that "their spouse knows." Except, often, they don't. Financial lives are quietly complex, and spouses frequently manage different parts of the household finances. If you handle the investments and your spouse handles the bills, neither of you has the full picture. (We explored this problem in depth in what your spouse doesn't know about your finances — it's more common than most couples admit.)

3. Documents scattered across filing cabinets, email folders, and online accounts. No one piece of paper or digital file contains the whole picture. Your family would need to be detectives — and even then, they'd likely miss something.

4. Nothing at all. A significant share of families have no documentation whatsoever. Every asset — the 401(k), the life insurance, the crypto wallet, the old savings account from a previous bank — exists only in the account holder's memory.

What a Complete Letter of Instruction Must Include

This is the actual content your family needs. Treat this as a checklist.

Section 1: Personal Information

Full legal name, date of birth, Social Security number
Location of your will, trust, and any other legal documents
Name and contact info of your attorney, financial advisor, and accountant

Section 2: Bank Accounts

Institution name and account type for every account
Account numbers (or enough information for your family to locate them)
Whether any accounts have named beneficiaries or TOD (transfer on death) designations

Section 3: Investment and Retirement Accounts

Brokerage accounts — institution, account type, approximate value
401(k) and IRA accounts — employer, institution, beneficiary named
Any pension plans or deferred compensation

Section 4: Life Insurance Policies

Insurance company, policy number, and face value for every policy
Contact number for the insurance company
Where the original policy documents are stored

This one is more urgent than it sounds. Many families struggle to locate life insurance after a death — the policy exists, the premiums were paid, but no one can find the paperwork. We've written a full guide on how to find a life insurance policy after someone dies that walks through exactly this.

Section 5: Real Estate and Physical Assets

Properties owned, addresses, and how title is held
Mortgage servicer name and account number
Location of deeds, titles, and vehicle registration documents
Any storage units, safe deposit boxes, or other physical locations holding valuables

Section 6: Digital Assets

Online bank and investment account usernames (passwords stored separately in a password manager — reference the password manager, not the passwords themselves)
Crypto holdings and wallet types (hardware wallet location, seed phrase instructions)
Email accounts, subscription services, and any accounts with stored value
Instructions for accessing a password manager or digital safe

Section 7: Debts and Liabilities

Mortgage(s) — servicer, account number, monthly payment, whether it autopays
Car loans, student loans, personal loans
Credit cards — issuers and whether they autopay
Any money owed to or by others (informal loans, business agreements)

Section 8: Recurring Subscriptions and Bills

Utilities, insurance premiums, and other autopay items
Subscriptions that should be cancelled immediately upon death
Any income sources that should continue (rental payments, dividends, royalties)

Section 9: What to Do First

This may be the most valuable section. Write a plain-English to-do list for your family for the first 30 days. For example:

Call [Life Insurance Company] at [phone number] — policy number [X]
Do not cancel any autopay arrangements until the estate is sorted
Contact [Financial Advisor] at [email/phone] — they know the full picture
The login for all online accounts is in [password manager/safe location]

How Often to Update It

A letter of instruction is only useful if it's current. Update it:

When you open or close any account
When you buy or sell real estate
When you get a new life insurance policy
After a major life event (marriage, divorce, birth of a child)
At minimum, once a year — set a calendar reminder

An outdated letter of instruction can be almost as harmful as none at all, because it gives your family confidence that the information is complete when it isn't. Think of it like the asset inventory checklist your family needs — it only works if it reflects your current reality.

How to Store It

Your letter of instruction should be:

Accessible — your family needs to find it without needing a court order
Secure — it contains sensitive financial information
In more than one place — one copy with your will (or your attorney), one copy your spouse or executor knows about

Do not store it only in a safe deposit box. In many states, a safe deposit box is legally sealed upon death until an executor is appointed — which can take weeks or months.

How Perpetual21 Makes This Easier

Creating a letter of instruction by hand works, but keeping it updated is where most people fall short. Perpetual21 is a private digital vault designed specifically for this: you map every asset you own — bank accounts, retirement accounts, real estate, life insurance, crypto, vehicles — in one secure place, and your designated family members can access it instantly if something happens to you.

Instead of a document that goes stale in a filing cabinet, it's a living record that stays current. The 7-day free trial is at perpetual21.com.

Frequently Asked Questions

What is a letter of instruction? A letter of instruction is a plain-language document that tells your family where all your financial accounts are, who to contact, and what to do after you die or become incapacitated. It's not a legal document like a will, but it's often more practically useful because it answers the questions a will doesn't.

Is a letter of instruction legally binding? No. A letter of instruction has no legal authority — it can't override your will or change how assets are distributed. Its purpose is purely practical: to make it easier for your family to find and access your assets. Because it's not a legal document, you don't need an attorney to write one.

What's the difference between a will and a letter of instruction? A will is a legal document that determines how your assets are distributed after death. A letter of instruction is a practical guide that tells your family where those assets are and what to do first. You need both. Most people have only one — and it's rarely the letter of instruction.

What happens if I don't have a letter of instruction? Your family will still be able to eventually access your assets — but it will take longer, cost more in legal and administrative fees, and be significantly more stressful. Some assets (particularly old accounts, unclaimed insurance policies, or digital assets) may never be found at all.

How long does it take to create a letter of instruction? For most people, a thorough first draft takes 2–4 hours. Subsequent updates take 15–30 minutes. The first pass is the hardest, because it forces you to inventory everything you own — which most people have never done in one sitting.

Should I include passwords in my letter of instruction? Not directly. Instead, use a password manager (like 1Password or Bitwarden) and include instructions in your letter of instruction for how to access the password manager. This keeps sensitive credentials secure while still making them accessible to your family when needed.

The Most Important Thing You Can Do This Week

If you have a will but no letter of instruction, your legal affairs are in order but your family's practical affairs are not. The document your family will reach for first is the one that tells them where everything is — and most people have never written it.

It doesn't have to be perfect to be useful. A draft is infinitely better than nothing.

Start with Section 9 — the "what to do first" list. Even half a page of instructions buys your family days of clarity in a moment that can otherwise feel completely overwhelming.

Then build from there.

For a structured way to pull all of this together in one secure, always-updated place, perpetual21.com offers a free 7-day trial.