Question 75 of 75. An Scorporation's tax years for 2019-2021 end on 12/27/2019, 12/25/2020 and 12/31/2021. What type of tax year does OOO this S Corporation use? Calendar tax year. 52-53-week tax year. Ownership tax year Tax year elected under IRC Section 444 Mark for follow up Back Save / Return Later Summary