I suspect you're confusing the SEC 179 50% depreciation allowance with the 100% Special Depreciation Allowance. They're two different things.

Hi Carl:

I'm trying to figure out what combination of section 179 expense, bonus depreciation and regular depreciation to take on a heavy truck purchased during 2019 and used in a business so as not to create a large Schedule C loss and trigger a large audit risk - the cost of the truck is $93k and if I take the entire $93k it creates a $30k Schedule C loss for which Turbo Tax is showing as a high audit risk. In 2018, a similar heavy truck was purchased and 100% depreciation was taken but it did not result in a Schedule C loss.