Thank you very much.
I was able to go the the form that is calculating the estimate amount.
So, it looks like IRS wants us to pay the estimate tax evenly even though we don't know how much in advance, and penalize us for not seeing the future, it looks like. The transactions that resulted in a higher than anticipated income was in the thired quarter. and that's why I paid most of the estimate tax in Q4. (No need to respond. I'm just complaining about the tax system. I know TurboTax didn't make it 🙂 )
