The problem is I am using 2210AI and TT does it correctly. However, it is Form 2210 that is done incorrectly. TT shows a correct penalty of 0, yet they show an underpayment of over $4,500 because the calculations of lines 18-26 are incorrect. It looks ridiculous to e file a correct tax return with the correct penalty of 0, yet Section A is not correct showing an underpayment
