30 page. Excerpt: This revenue procedure updates Rev. Proc. 2005-67 ... and provides rules under which the amount of ordinary and necessary business expenses of an employee for lodging, meal, and incidental expenses ... incurred while traveling away from home are deemed substantiated ... when a payor (the employer, its agent, or a third party) provides a per diem allowance under a reimbursement or other expense allowance arrangement to pay for the expenses.

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