Yes line 38 is easy to miss. And it can also reduce a refund on line 35a. It's only an estimated penalty. It's common and normal and expected for the IRS to adjust the penalty and bill you for more or send you a refund.
You can save your return with another name to test in. Go up to File-Save As. Then you can fill out the 2210 worksheet. It's under....
Federal tab or Personal (for Home & Business Desktop)
Other Tax Situations
Additional Tax Payments
Underpayment Penalties - Click the Start or update button
If you have the desktop program you can switch to Forms Mode (click forms in the upper right (left for Mac)) and open the 2210 form. If the 2210 doesn't show up in the left column, click on Open Forms at the top of the left column. Type 2210 in the search box and open the 2210 form.
