Estimated taxes: how is TT calculating the "Business Income Deduction"

I am going through the step-by-step for estimated tax payments. I've entered my best guesses for self-employment income, farm rental income, and interest and dividends. I'm at the screen labeled "Enter 2022 Adjustments" and on the line labeled "Business Income Deduction" TurboTax has prefilled the box with a number (11,134) but I can't get any details on how it was calculated. How was this number determined? Thanks.TurboTax estimated tax business income deduction.JPG