If you were self-employed you enter your home office on your schedule C with your other business expenses.
W-2 employees cannot deduct expenses for working from home. Job-related expenses were eliminated as a deduction for W-2 employees by the tax laws that changed for 2018 and beyond. Your state tax laws might be different.
https://ttlc.intuit.com/questions/4482873-which-federal-tax-deductions-have-been-suspended-by-tax-re...
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