In the desktop version of TurboTax the Taxable IRA Distribution Worksheet is generally near or at the bottom of the list of federal forms in forms mode. In all versions of TurboTax, it is part of the pdf that is generated when you select to print all forms and worksheets.
Until you explicitly enter a nonzero value, TurboTax assumes that your year-end value in traditional IRAs is zero. Entering a zero into the previously blank field won't change the calculation.
