The US has a pay as you go system. That is, you need to have paid most of your tax by the end of the year. In addition, you need to have paid your tax in quarterly installments in accordance with your income.
Do you have a form 2210? Does Part III show a penalty computation? If so, it is possible that you would benefit from the Annualized Income Installment Method (see Schedule AI on the 2210).
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