Yes, you can deduct the per diem rate. It goes in the Meals & Entertainment area of your business expenses.
You can find the current Per Diem rates for the location to which you traveled at this link http://www.gsa.gov/portal/content/104877. Remember to select the correct tax year (2016) from the drop down menu.
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Do I deduct 50% of the per diem rate or the full amount?
Also I'm self employed and it was for real estate rental business. I don't think there's a place for meal and entertainment for rental real estate. Would it go under Travel instead?
No, you cannot take a per diem deduction for investment property. Investment property expenses must be specific and itemized by category. Your question does not state whether this relates to rental property, land investment, or any other. All investment property expenses must be specifically identified.
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