It starts right at box 2. Turbotax asks for federal tax withheld. W-2 (actually box 2a) reports taxable amount of wages from box 1. Turbotax box 3 asks for social security wages. W-2 reports Capital Gains included in box 2a. All subsequent boxes also don't correspond and TurboTax doesn't even ask for some information provided on the W-2 (e.g. W-2 box 5: Employee contributions/Designated Roth contributions or insurance premiums.
