If you are using a desktop version of TurboTax, then you have access to Forms mode and you can see for yourself where the number comes from. Highlight the number in question, right-click on it, and choose Data Source. A window will open to tell you where that number originated. It may show a source (such as a worksheet) that you do not see down the left side of the page, but you can search for it by clicking Open Form in the upper left corner, typing the form name, and opening it to dig further.
But to save you some steps, the Simplified Method Smart Worksheet line A (Gross Income Limitation) comes from Form 8829 Worksheet, Part II, line 9. This is the worksheet that you may need to search in order to view it.
When you look at the Form 8829 Worksheet, Part II, line 9, you will see that it is a calculated value, not a direct transfer from another point in your tax return. Often the Part II, line 2, percent of gross income from business use of the home reported on Schedule C is the source of any issues with negative results which disallow the simplified method of claiming home office expenses. If the percent of gross income from business use of the home is zero, then line 9 will possibly be the same value as the loss of the business, line 28 from Schedule C.
This Part II line 2 value is entered on a page with the title Business conducted in home office. This screen is part of the Home Office Expense section of your Schedule C.
I will happily review a diagnostic copy of your return to further explain what is happening in your particular situation. The instructions for providing the token number are in a thread above.
@massif00
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