I can't figure out why Turbotax Home & Business is saying in Review that I owe an estimated tax underpayment for 2021. My income is much less than in 2020, was not episodic, my quarterly estimated tax payments were high, consistent and on time, I am owed a considerable Federal refund according to Turbotax, so, without knowing my specific situation, can anyone explain why Turbotax is telling me in the Review I owe an estimated tax underpayment penalty of $100 and have to declare the date when I will separately pay it to the IRS, despite being owed much more than that in refund?
