I early filed 1040 and received a tax refund. I will file 1040X by the original deadline to report additional income. TurboTax is showing the reduced amount of refund on the bottom line, not the net balance I owe. Is that the correct way to do this?

if your refund is reduced, you will owe a check to the IRS.

review your 1040X form carefully before you submit it,

or you will have twice the problem.

Where in Form 1040X and where in TurboTax do I enter the amount of tax refund I already received due to the previously filed tax return that I am now amending?