What form and line do I deduct the 37 1/2 cents per mile on for my business travel and do I need to figure depreciation of the vehicle, too?

A Sole Proprietor's business use of a car or truck is claimed on line 9 of Form 1040, Schedule C (PDF), Schedule C, Profit or Loss from Business or, if eligible, line 2 of Form 1040, Schedule C-EZ (PDF), Net Profit from Business. You may use either the actual expense method in calculating your car or truck expense or, if eligible, the 2004 standard mileage rate of 37 1/2 cents per mile. Depreciation expense is already included in this standard mileage rate. Depreciation is only calculated as a separate expense when using the actual expense method. Deductible employee business use of a car or truck may be taken on Form 2106 (PDF), Employee Business Expenses , or if, eligible, line 1 of Form 2106-EZ (PDF), Unreimbursed Employee Business Expenses. The car and truck expenses are then taken with other employee business expenses on line 20, Form 1040, Schedule A&B (PDF) Itemized Deductions . For more information, refer to Publication 463, Travel, Entertainment, Gift, and Car Expenses , and Publication 535, Business Expenses .