You have to ask the IRS. If they send you a different amount they will send you a letter in a couple weeks. You may have a prior tax due or an offset or they changed your return. Are you checking from the actual 1040 line 35a and not the total Turbo Tax showed you at the end? State refund comes separately. At the end Turbo Tax just shows you the net federal and state combined. But that is only for your info.
