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If so, what Turbo Tax package would you recommend?
Yes, the expenses are still deductible in 2018 even though you didn't form the LLC until 2019.
You will need to use TurboTax Self-Employed Online or Home and Business Download to enter the expenses. The Self-Employment section is under Wages and Income. For the online version, you will enter both income, and expenses, including startup costs, in this area.
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