I printed my returns and I got 4 2018 Form 1040-ES Payment Vouchers indicating I owe $648 in Federal Tax. However, my Federal Returns show I'm getting a refund. Why?

[VolvoGirl]

Those are not for your tax due.  Those are 1040ES quarterly estimated payments for NEXT YEAR.  The are pre-payments so you don't end up owing next year.  They are optional to pay and don't get sent with your return.  You can get them when you have a refund.  I do every year.  Turbo Tax thinks you need them.  Did you get a one time jump in income like a 1099R?  Or a lot of investment sales?