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Many expenses are tax deductible. However, taxpayers are entitled to take the expenses only once per return. TurboTax is verifying that the expenses that have been entered are not entered anywhere else in the program.
If you are reporting a home office deduction, for example, TurboTax will automatically split the business and personal use portions when entered in the Home Office Deduction area. In other words, do not enter it again in your personal deductions area of the interview.