As JulieS suggested, Pay Towards Your Balance would probably have been your best option.
That said, Pay 2021 Income Tax should suffice.
If you should receive another letter relating to the underpayment penalty, just explain to the IRS in a letter the same thing you’re explaining to us – that you went online to pay the penalty, no options were specific to the penalty, so you chose one that seemed correct. Heck – you can even point them to this conversation showing your due diligence in trying to make the payment correctly.
They’ll be able to match up the payment then.
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