Do you mean a 1099-NEC? Whether you realize it or not, you have already started a business. If you are doing work and earning income on a form 1099-NEC, you are already self-employed. In TurboTax, you enter this income on Schedule C, which is a business tax return. So, you are in the right spot. After you have entered all of your income, you will be given the opportunity to deduct all of your business related expenses, including your vehicles mileage. You can only deduct mileage on a business return (other than medical and charity).
Go through the business questions, and after you have entered all of your income, you will be prompted to enter business expenses. Here are instructions to enter all of your business expenses. Where do I enter my self-employment business expenses, like home office, vehicle mileage, and suppli...
Some other information you may find helpful - What's different now that I'm self-employed in 2021?
@vinny4
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