Key legal question
Whether commuting expenses for income tax may be calculated by using the taxpayer's total business driving distance and offsetting the employer's car allowance.
Extracted holding
No. The commuting deduction must be calculated only on the basis of the commute between home and work; the employer's reimbursement for business travel cannot be mixed into that calculation.
Extracted reasoning
The statutory and regulatory scheme concerns only commuting costs. The mileage allowance already reflects average vehicle costs and may not be reduced again by reference to total driving distance, which would duplicate the same element and improperly lower the lawful flat-rate deduction.