Print or type "Deceased" and the date of death next to the taxpayer's name at the top of the return. Failure to file timely could result in an escape assessment and tax bill for each affected tax year from the date of death to the current tax year.You have 30 days from the date on your notice to respond to the Request for Tax Return. What you need to do. File the final income tax returns of a deceased person for current and prior years, pay any balance due and claim the refund. File an estate income tax return. To start the process of obtaining a letter of administration, you must fill out Form DE150. Discover the precise steps to secure Letters of Testamentary in California. Our comprehensive guide makes the process straightforward and hassle-free. Forms are available for download and use.