After you file

Thanks for the reply.  I had prepaid taxes so I don't owe, however this error greatly increased my refund.  I'm trying to do the ammendment on turbo tax but the way it's displaying the new amount is that now I pay the difference (even though I  haven't received the refund yet). Ultimately I would still get a refund, not owe. If I submit this, will it be offset or should I wait and pay the overpayment back? Should I wait to do the ammendment after I get the refund?