Line 15 would be your taxable income. It could be blank if you had deductions that reduced it to zero. I suggest you look at line 9, total income, and then at the lines below that to see what reduced your income.
You can view your form 1040 while working in the online version of TurboTax by following these steps:
While working on your return in the Federal section of TurboTax:
1. Choose the Tax Tools icon on your left menu bar
2. Tools
3. View Tax Summary
4. Choose the Preview my 1040 on your left menu bar
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