TurboTax assumes that you earned the income for the year evenly throughout the year, and the IRS wants you to pay your estimated taxes as you receive the income, evenly throughout the year as opposed to one large payment at the end of the year. That's how you can wind up owing an underpayment penalty despite having paid in 110% of your 2023 tax liability.
DianeW777's advice addresses this situation.
@shauna-a-jennings
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