Correction: I just posted but then erased my post. Here's what Annette posted earlier -- it's the correct method:
- Click Forms on the top row of TurboTax.
- Go to Form 8829.
- Scroll to the section titled Line 8 Calculation Smart Worksheet and enter your percent of business use of the home office on line B.
- Click Step-by-Step at the top of the screen to go back to the input screens.
