The banker is kind. She has already said she is sorry for your loss twice. Then she turns her screen slightly and asks, "What's the estate's tax ID number?"

You stare at her. You have a death certificate, a folder, and a headache that started three days ago. You have your father's Social Security number memorized from a lifetime of forms. You have no idea there is a second number, that it belongs to a person who doesn't exist yet, and that you are the one who has to create it.

This is a small bureaucratic moment, and it tends to stop people cold, because it is the first time the paperwork of death asks them to invent something rather than hand something over.

An estate is a separate taxpayer

When someone dies, their Social Security number does not simply keep working for everything. For tax purposes, the moment of death splits the financial world in two.

Before death, income belongs to the person and is reported under their SSN. That is the final personal return, with its own rules and deadline.

After death, the estate becomes its own legal entity. It can earn interest, receive dividends, collect rent, and be paid an invoice that a client owed. All of that income belongs to the estate, not to the person, and it is reported under the estate's own Employer Identification Number, or EIN.

The IRS calls that number an employer ID, which makes it feel irrelevant to a grieving daughter. An estate has no employees. But the EIN is simply the IRS's identifier for any entity that isn't a human with an SSN: trusts, partnerships, nonprofits, and estates.

Why institutions insist on it

The number looks like a formality, but it does real work.

It opens the estate bank account. Banks generally want the EIN, the death certificate, and proof of the executor's authority before opening an account in the estate's name. That account is where the money should flow so personal and estate funds never mix.

It keeps income from landing in the wrong place. Interest, dividends, and payments made after death should be reported under the estate's number. Payers who keep using the decedent's SSN create mismatched tax records that someone has to untangle later.

It lets the estate file its own return. If the estate's gross income for the year is $600 or more, the executor generally must file Form 1041, the income tax return for estates and trusts. (An estate with a nonresident alien beneficiary has a lower threshold.) That return needs the EIN.

It marks the executor as the responsible party. The person who signs the application is the one the IRS will contact. That is a modest detail with a real implication: the number ties you to the estate's tax obligations.

How to actually get one

The good news is that this is one of the few pieces of estate administration that is fast and free.

The IRS issues EINs at no charge. The usual route is the online application on IRS.gov, which can issue the number immediately when you finish. You choose "estate" as the type of entity, enter the decedent's name and SSN, and identify yourself as the executor or personal representative. You can also apply by fax or mail using Form SS-4, which is slower.

Be wary of websites that charge a fee to "help" you obtain an EIN. The application itself costs nothing, and the paid sites are simply standing between you and a free government form.

A few details are worth knowing before you sit down:

  • You need legal authority first, in most cases. If a court has appointed you, the document that proves it (letters testamentary, or letters of administration if there was no will) is what the bank will want to see alongside the EIN. The number itself doesn't prove you're the executor. It only identifies the estate.
  • You'll choose a tax year. An estate may use the calendar year or pick a fiscal year ending up to twelve months after the date of death. That choice can shift when income is taxed and when the first return is due, so it's worth a conversation with a tax preparer before you commit.
  • Keep the confirmation letter. The IRS sends a notice (CP 575) with the number. Treat it like a certificate. Banks and brokerages often ask for a copy.

The mistakes that cause the most trouble

Reusing the decedent's number for post-death income. It feels efficient. It creates a records problem when the IRS sees income reported under a taxpayer who is no longer alive.

Assuming a business's EIN covers the estate. A single-member LLC or sole proprietorship may have its own EIN. That number belongs to the business. It does not substitute for the estate's, and the estate's does not replace the business's. They are separate identifiers for separate entities.

Forgetting Form 56. This short form notifies the IRS that you are acting as a fiduciary for the decedent. It tells the agency who to write to about the estate and the person's final affairs, which prevents notices from landing at a dead person's address.

Ignoring how fast estate tax brackets climb. Income kept inside an estate is taxed on compressed brackets, and the top rate is reached at a far lower income than for an individual. In recent years that threshold has been a little over $15,000. Executors who let income pile up in the estate can pay a higher rate than a beneficiary would on the same money. That is a reason to ask a professional about distributions, not a reason to hurry them out the door.

Your next moves

You don't need to wait for a death to do the useful part. If you are an executor, or you are preparing someone to become one, here is what to do this week.

  • Write the sequence on one page. Put it in this order: death certificates, court appointment (letters), EIN, estate bank account. Each step unlocks the next, and seeing the order removes a lot of panic.
  • Bookmark the official IRS EIN page and Form SS-4. Note in your instructions that the application is free and that any site charging a fee is not the IRS. That one sentence can save your executor a surprise charge during the worst month of their year.
  • List every source of income that might arrive after death. Think interest, dividends, rent, royalties, client invoices, and refunds. Next to each, write where it will be paid. Your executor then knows which payers must be told the new EIN.
  • Name a tax preparer now. Put the name and number of a CPA or enrolled agent who handles estates in your instructions. Ask them in advance whether they'll take the work. A preparer who already knows the situation shortens the first 1041 conversation considerably.
  • Tell the person you named what an EIN is. A single sentence does it: "After I'm gone, you'll apply for a free tax ID number for my estate, and you'll need it to open the account." Executors who know the step exists don't freeze at the bank counter.

Where this fits

The EIN is a tiny object with an outsized job. It is the handle the entire estate hangs from: the account, the return, the income. And it is exactly the kind of fact a family can't improvise while grieving, because no one thinks to look for a number that doesn't exist yet.

That gap is what Heirloom was built to close. It's a binder for solo founders that keeps the vault, the handoff instructions, and the beneficiary details in one place, so the person you trusted with all of it finds a clear sequence instead of a blank screen at a banker's desk. If you want to see what that looks like, you can look around at Heirloom. Whether or not you do, write down that one page of steps today. Someone you love will be glad it exists.