After you file

Did Turbo Tax print out a 1040V voucher slip to send the payment in?  Look for one.

 

There are probably also four 1040ES slips  to send in estimated payments for NEXT year so you don't end up owing so much again.  So be careful what voucher slip you use.  The estimated payments are optional to pay.  You can ignore them if you owed because you had a one time increase in income like a IRA withdrawal.  If you owed because of self employment income or pension income you should consider sending in extra during the year using the 1040ES slips or paying directly online.