You have a business selling items on Poshmark and you need to report the business income and expenses on a Schedule C. To do this you need to use TurboTax Self-Employed (online) or TurboTax Home & Business (CD/Download).
Poshmark collects the appropriate sales tax for the state of the purchaser. Please see this link for more info: https://blog.poshmark.com/2019/08/21/your-guide-to-sales-tax-on-poshmark/
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