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@baldietax @NCperson  Thank you

I have two parts of large capital gains. One occurred before August 31. Another is around Oct 30. If with only the first part, I estimated that I am OK, because I increased per paycheck withholding. However, the Oct sale is not planned. And with this second part of capital gains, I will probably owe some tax at end of the year. Now I want to know if I can pay this ahead and avoid penalty.

One question is since I did not know I will make the second part of my capital gains and I would not expect I will have to pay additional tax, why will I be considered late for paying estimated tax for previous quarter?

Another is I did not set up estimated tax beginning this year, can I still pay that for one time?

Thank you