At the end Turbo Tax shows you the net combined amount of federal and state. But that is only for your own info. You will get the full state refund and need to pay the federal tax due yourself.
How to pay the IRS
https://ttlc.intuit.com/community/tax-payments/help/how-can-i-pay-my-federal-taxes/01/26212
Maybe this will help. Different ways to pay the IRS
https://ttlc.intuit.com/community/tax-payments/help/how-can-i-pay-my-federal-taxes/01/26212
You can pay the IRS directly at
https://www.irs.gov/payments
