Mileage Allowance A deduction of automobile expenses for people using their vehicles for business, charity, moving, medical or any other purpose that qualifies for a deduction. Investopedia Says: There are different categories of purposes for deductible automobile-expenses, each of which has a specific cent-per-mile deduction. Careful documentation of the mileage and the reason for the trip is essential for audit-proofing your taxes. Related Terms: Child Tax Credit Convention Expenses Deduction Exempt Income Gas Guzzler Tax Income Tax Itemized Deduction Lifetime Learning Credit Write-Off |