You don't get a 1099 from an employer. You get a W-2. If you got a 1099-NEC you are self-employed, or in business for yourself (two different terms for the same thing). The company that paid you for your work and gave you a 1099-NEC is your customer or client, not your employer.
The tag below your question indicates that you are using TurboTax Deluxe Online. You can enter 1099-NEC income in Deluxe, but you cannot enter any business expenses and you cannot enter self-employment income that is not reported on a 1099-NEC. For either of those you would have to upgrade to Premium.
