How to Complete Forms; Decedent's Estate Account. Directions for Completing Account Form in a Decedent Estate.You will need account numbers and serial numbers of assets. For bank accounts, list banking institution and amount. Do not provide financial account numbers on this form. Please note: Some forms are not electronic forms. You must complete these forms and print them to be returned to the bank. Have you named a beneficiary on your bank accounts? A New York estate planning attorney explains the pros and cons of payable on death designations. All downloadable forms on this website are in a PDF file format.