Hi!
Because the space isn't used exclusively for your self-employment work, you will have some limitations. TurboTax will land you on a screen that asks about sharing the space for other work or with another person. You would indicate that you use it for another business (your W2 salaried position) and would need to be sure to answer the questions about the percentage of work done in the office. The Tax Cuts and Jobs Act of 2017 suspended unreimbursed employee business expenses so you won't have a deduction for the use of the office while conducting the work for your salaried position.
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Elizabeth W, EA
