The standard deduction has nothing to do with your sole-proprietorship. You need to file a schedule C. In TurboTax that is in the 'Business Items' section of the wages and income section on your federal return. When you click start next to the schedule C there the system will walk you through entering your 1099-K and then will take you to an area where you can enter all of your business expenses - all of the expenses that you had in order to earn the money on the 1099-K. Once you have done that you will only be taxed on the money that you got to keep.
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