IRS Form 4810
IRS Form 4810 is the Request for Prompt Assessment Under Internal Revenue Code Section 6501(d).
This form is used to request that the IRS make a "prompt assessment" of the taxes owed by a deceased person.
The IRS has up to three years to audit a person's tax returns, but that timing can be challenging when Settling an Estate; often tax information is needed more quickly to help finalize all required returns, as well as assess the full scope of Debt incurred by the deceased.
The process of managing a deceased person's taxes can be complicated, so it's best to speak with Certified Public Accountant to help navigate the process.