If you are using TurboTax Online, you will need to upgrade to the Premium Edition to enter expenses on Schedule C. You can click on Not Started to begin entering your expenses. If you have not set up your business profile (Schedule C), you will need to do that first.
Where do I enter Schedule C?
What self-employed expenses can I deduct?
Where do I enter my self-employment business expenses, like supplies and vehicle mileage? this link has instructions to manually enter your SE expenses.
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