Since you are over 59 1/2 and had the account for more than 5 years you can skip answering the question about the net contribution. You can leave it blank. TurboTax can see from the code on your Form 1099-R (code Q or T) that this is a qualified distribution and not taxable.
You can check line 4b of Form 1040 that it isn't taxable.
To preview Form 1040 in TurboTax Online:
- Click on "Tax Tools" in the left menu
- Click "Tools"
- Click "View Tax Summary" in the Tool Center window
- Click on "Preview my 1040" on the left
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