Days are off, that's the difference between TurboTax and the IRS. TurboTax calculates it exactly using the best information available and the IRS uses the information in it's computers.
It decides when and how much your estimates should be. TurboTax uses the dates that you enter - which, as you pointed out, can be different than the ones that the IRS is using.
TurboTax uses the information rolled forward from the prior year - which may have been adjusted by the IRS for any number of reasons.
TurboTax also estimates the date of payment on the final tax as of the day that you finish the return. Not necessarily the 15th of April. So the only difference is just dates.
@Frank nKansas
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