I have used Turbo Tax for many years and have always understood how you arrived at the amount for the Form 1040-ES payment vouchers. My refund was 30% greater than my total tax and I elected to apply that amount to my 2019 estimated tax. The vouchers have 4 equal payments and if followed I will again overpay by more than 30% because of the applied refund.
You don't have to send in all four estimated tax payments. Just send in the last three since the 1st quarter is being paid by your 2018 federal income tax refund.
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