I agree 100% that TTax should NOT auto-check the box that says "Do not use the annualized income installment method" immediately after guiding the user through the process of entering all the data for the method. Took me a few iterations to figure out why TTax kept saying I owe tax penalty even though I paid the estimated taxes on time, and I THOUGHT I put in all the correct data by quarter on Form 2210/AI input screens. That check box the end should have been unchecked by default unless the user decided NOT to use the method after seeing the end results. It was quite confusing and frustrating.
