Yes, there are deductions that can potentially reduce his tax liability. If he hasn't already, he can deduct his mileage, part of his cell phone bill, and any other expenses he incurred that were directly related to being a DoorDasher. If you haven't upgraded to TurboTax Self-Employed, you will need to do so in order to deduct expenses on Schedule C. See the following TurboTax Help article for Uber & Lyft drivers, the concepts are the same for DoorDash:
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