Thank you for the diagnostic file. The missing percentage of business use of the home office is preventing the Simplified Method calculation.
Since you are using a desktop version of TurboTax, you can enter the percent of business use of the home office using Forms mode. Go to Form 8829 under your Schedule C and scroll to the section labeled Line 8 Calculation Smart Worksheet. You will see the date you first used the home office on line A. Enter the percentage on line B. Since this is not an override, there is no danger in voiding the TurboTax accurate calculation guarantee.
Using the step-by-step method, the input screen appears in the Home Office section of business expenses. The title of the screen is Business conducted in home office and it asks for the percentage of time spent conducting business in the home office.
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