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Is there a tax deduction for renting office space in service of employer?
According to this post on TurboTax forums, you could deduct it as an "Unreimbursed Employee" expense. This would seem consistent with the IRS Guidelines on such deductions: An expense is ordinary if it is common and accepted in your trade, business, or profession. An expense is necessary if it is appropriate and helpful to your business. An expense does not have to be required to be considered necessary. Office rent is not listed explicitly among the examples of deductible unreimbursed employee expenses, but this doesn't mean it's not allowed.  Of course you should check with a tax professional if you want to be sure.