I am struggling with the same issue. To prove that I owe a smaller penalty (or that I do not owe one at all), I need to annualize my income, but after hours with a spreadsheet trying to figure out how TurboTax has calculated my AGI so that I can provide the cumulative AGI by period, I am at a loss. Is the only option really to pay a penalty I don't actually owe? TurboTax not showing its work here is very expensive for its customers and damaging to my experience.
