Please see below for information on why you are getting an underpayment penalty.
https://ttlc.intuit.com/community/tax-payments/help/why-am-i-getting-an-underpayment-penalty-if-i-m-...
If you would like to contact customer support for additional assistance please see below.
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
