Underpayment Penalty and Interest Calculation

[samarth2222]

For 2024, I was unemployed, so my W2 income was $0. However, I had significant income from my dividends, interest and capital gains majority of which was in Q1 2024. I owe about $13,000 of taxes for tax year 2024 for my dividends, interest and capital gains as shown by TurboTax. TurboTax also mentions I have to pay a $470 of underpayment penalty since I did not make any quarterly payments in 2024. Is $470 the total underpayment penalty + interest amount I have to worry about for 2024? Or this is just the penalty and IRS will send me a separate payment notice for the interest?

[Mike9241]

there is no interest on the underpayment penalty unless you fail to pay your taxes and underpayment penalty by 4/15/2025

[samarth2222]

Great. Thanks. What exactly is the calculation formula for this penalty amount if I made this capital gain in Feb 2024?