Additional refund due
My 2019 return has been accepted by the IRS, but I have not yet received my refund of $400. Now I see that I I am due a larger refund (I forgot to include my estimated tax payment from last year). Question: should I submit a corrected return now, while the first one is still in progress, or wait until every thing is settled and I have my initial refund in hand? I don't want to muddy the waters in any way. Thanks for any help.