If you’re named as executor in someone’s Delaware will and need to manage their estate, you’ll need letters testamentary to act legally. These are official court documents that confirm your authority to collect assets, pay debts, file tax returns, and distribute property. Without them, banks, brokerage firms, and real estate offices won’t recognize your role even if the will names you. Filing for letters testamentary is the first formal step in Delaware probate, and doing it correctly avoids delays, pushback from institutions, or personal liability.

What are letters testamentary in Delaware?

Letters testamentary are issued by the Delaware Register of Wills after reviewing your petition and confirming the will is valid. They’re not the same as letters of administration (used when there’s no will) or short certificates (copies you’ll request later for institutions). In Delaware, the document is sometimes called “letters testamentary” or simply “letters” but the function is the same: proof you’re authorized to act on behalf of the estate.

Who files for letters testamentary and when?

You file if you’re named executor in a valid Delaware will and the deceased was a resident of Delaware, owned real estate here, or held significant assets in the state. You can begin the process as soon as the person passes away, but it’s best to start within a few weeks. Delays don’t invalidate your appointment, but they can stall access to accounts, delay bill payments, or trigger late fees on taxes or mortgages. If the will names co-executors, all must typically sign the petition unless one formally declines.

Where do you file and what forms do you need?

You file with the Register of Wills office in the county where the deceased lived. For example, if they lived in New Castle County, you go to the Wilmington office. The main form is the Petition for Probate of Will and Appointment of Executor, along with the original signed will, a certified death certificate, and a completed Inventory of Estate Assets. You’ll also need a $10 filing fee (cash or money order no checks) and a self-addressed stamped envelope for return mail. Some counties accept filings by mail, but in-person submission is faster and lets you ask questions on the spot.

What happens after you file?

The Register of Wills reviews your paperwork for completeness. If everything is in order, they’ll issue letters testamentary usually the same day or within 1–2 business days. You’ll receive an original document and can request certified copies (called short certificates) for $5 each. These are what you’ll give to banks, title companies, and retirement plan administrators. Keep the original safe it’s not replaceable if lost. You’ll also get a case number and notice of any upcoming deadlines, like filing the estate inventory or tax returns.

Common mistakes people make

  • Submitting a copy of the will instead of the original: Delaware requires the original signed will. A photocopy or PDF won’t be accepted.
  • Misidentifying heirs or omitting known beneficiaries: The petition asks for names, addresses, and relationships of all heirs even those not named in the will. Leaving someone out can lead to objections or delays.
  • Skipping the asset inventory: Even if the estate is small, Delaware law requires you to list all known assets and estimated values. An incomplete or vague inventory may trigger follow-up questions or requests for documentation.
  • Assuming letters testamentary let you skip other steps: Getting letters doesn’t mean probate is done. You still need to notify creditors, file tax returns, and follow Delaware’s probate court requirements.

Practical tips for a smoother filing

Gather everything before you go to the Register of Wills office. Make two full sets of documents: one for filing, one for your records. Bring photo ID you’ll need it to sign affidavits. If the will names alternate executors, have their contact info ready in case the Register has questions. And if the estate includes real estate, bring the deed or property address; that helps confirm jurisdiction. You don’t need a lawyer, but if the will is contested, assets are complex, or heirs disagree, consulting an attorney early can prevent bigger issues later. For help understanding what comes next, see our overview of what happens after letters are issued.

What to do right after you get letters testamentary

First, request at least five certified short certificates you’ll need them for every institution holding estate assets. Then review your full list of required paperwork for executor appointments, including IRS Form 56 and EIN application. Start identifying and valuing all estate assets, and begin notifying known creditors. You’ll also need to track expenses and distributions carefully Delaware requires you to account for all activity before closing the estate. For a clear breakdown of ongoing duties, see Delaware estate administration duties for executors.

Next step: Download the official Petition for Probate form from the Delaware Register of Wills website, fill it out with your information and the decedent’s details, and bring it along with the original will and death certificate to your county’s Register of Wills office. You can find step-by-step instructions and county-specific contacts on the How to file letters testamentary in Delaware page.