I have discovered this problem today with at least two clients and the answers I have received so far from ProSeries are just not satisfactory.  I spend over $6000 a year for this program and I expect it to work.  Now I have clients whose estimated payment did not come out as indicated within the program.  ProSeries now admits there was a problem but according to a support representative, there is nothing to worry about since the record indicates the taxpayer tried to make the payment in a timely manner.   Yet, the EFTPS people have ABSOLUTELY NO RECORD of any attempt to make an estimated payment for the two taxpayers I checked with them about.  EFTPS specifically told me the only explanation is a transmission problem on Intuit's end.  Maybe that is the case or not.  But what I want to know is this.  Will Intuit cover the underpayment penalties incurred by my clients because their program isn't working properly?