About Application for Letters Testamentary
Enables an applicant named in a decedent's will to petition the court for appointment as personal representative to administer a testate estate.
When you'd use it: File when the decedent died with a valid will and the named personal representative seeks Letters Testamentary from the probate court.
Where to get the official form
The official version of Application for Letters Testamentary is published as a PDF by the Missouri courts. We checked this link and it resolved to a form on an official court or government website — always download the current version directly from the source rather than a third-party copy:
Verified official PDF
Download Application for Letters Testamentary (PDF) →
Source: stlcitycircuitcourt.com
Link last checked: June 27, 2026
How to file Application for Letters Testamentary in Missouri
- Step 1 — Confirm you have the correct formUse Application for Letters Testamentary when file when the decedent died with a valid will and the named personal representative seeks Letters Testamentary from the probate court. Double-check it's the right form for your situation — Missouri probate forms are revised periodically, so verify the name and number against your court's current form list before you start.
- Step 2 — Complete every required fieldFill out Application for Letters Testamentary carefully and review it for errors before filing. Probate cases can already take months — a small mistake on the form can set your timeline back further.
- Step 3 — Get it notarized or witnessed if requiredSome probate forms must be signed in front of a notary or witnesses. Check the instructions on the form itself, and arrange notarization before you file if it's required.
- Step 4 — File it with the correct courtSubmit Application for Letters Testamentary to the probate court or county clerk handling the estate — usually in the Missouri county where the deceased lived. Ask the clerk how they prefer to receive filings (in person, by mail, or e-filing).