The quarterly payments would be your total tax withheld for the year, as reported on your W-2 form, divided up by the numer of days in the year and then multiplied by the number of days in each quarter. So, it is an average of sorts. You can enter the actual amount you had withheld for each quarter if you use the Underpayment Penalties menu option in the Other Tax Situations section of TurboTax, under the Additional Tax Payments menu option.
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