@DMarkM1
Hi Mark - it does't really matter too much what you put in for Q1 thru Q3 (Q4 is always pre-filled by Turbo with "zero" (which is of course incorrect, should be AGI)). Here's some sample test values which reproduce the issue:
For the AGI screen, try
Q1: 50K; Q2: 75K; Q3: 100K
Once you enter those 3 values, the penalty clears in the upper left corner.
The remaining screens have virtually no impact on calculating underpayment but here's some sample values...
For the Net Cap Gains screen, try:
LTCG: 100; 100; 100
Qual Div: 1K; 2K; 3K
For QBI screen, try:
50; 75; 100
For Credits screen, try:
100; 200; 300
As soon as "Done with Annualized Method" button is selected, the penalty is re-introduced in upper left. The data in the above screens will now again be zeroed out.
