The IRS does provide an exception to keeping records (actual receipts) for any expense, other than lodging, that is less than $75. Your policy may include the use of per diem allowances for meal and/or lodging expenses during travel.
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Cohan rule is a that has roots in the common law. Under the Cohan rule taxpayers, when unable to produce records of actual expenditures, may rely on reasonable estimates provided there is some factual basis for it. The rule allows taxpayers to claim certain tax deductions on the basis of such estimates.