After you file

What does the new amended return show?  Is there a tax due on line 20?  Or does the added Schedule C show a loss on line 31?  

Line 18 should be your original refund amount and line 22 should be your additional refund.  If you paid on your original return it will be on line 16.  If there is an amount owed with the amendment, it will be on line 20.