TurboTax estimates no underpay penalty, but the IRS did

[caceyc]

TurboTax, in other tax situations, tells me there is no penalty since the income was only in the last quarter of 2023. However, after filing, the IRS assumed income was throughout the year and penalized me. It looks like 2210 was not filed; I can't find a way to input the timing of the income either. 

[VolvoGirl]

Did you fill out form 2210?    It's under

Federal 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.  Check box C to let the IRS calculate it.