Turbotax Premier for Desktop user here.
I filed my 2019 returns in February and owe additional taxes which I've not paid yet due to the COVID-19 payment extension to 7/15.
Recently I discovered that I missed a tax credit which now lowers my tax liability. Following the process for filing a 1040X detailed elsewhere the resulting 1040X shows that I'm due a refund (the difference in what I was to have paid on 4/15 (now due on 7/15).
What do you recommend as the best process to handle this situation? File the 1040X now & then pay the original amount due on 7/15 providing IRS issues refund now? Or send the IRS the original amount due on 7/15/20 and then file amendment later this year to obtain the refund? Or do you recommend something else?