Yes, if you are using TurboTax Online, you have to upgrade to Premium to deduct business expenses.
I am assuming that you have a 1099-NEC for your side job. If you have a W-2 for your side job, you can't deduct any expenses related to your work at all.
If you want to switch to the Desktop product, which you install on your computer, you can include self-employment income and expenses in the Deluxe version. Follow this link for more about that.
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