A taxpayer files their return on October 1, 2021. what is the earliest that the IRS will owe them interest income on the unpaid amounts. you must ignore any disaster extensions for this question) a. 45 days from April 15 b. 45 days from October 1 c. Never, IRS doesn't have to pay interest d. 45 days from March 1 e. 45 days from October 15 (last day for extensions)