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The tax laws very clear. The IRS website says, if you use your car only for business purposes, you may deduct its entire cost of ownership and operation subject to limits discussed later. However, if you use the car for both business and personal purposes, you may deduct only the cost of its business use. You can generally figure the amount of your deductible car expense by using one of two methods: The standard mileage rate method or the actual expense method. If you qualify to use both methods, you may want to figure your deduction both ways before choosing a method to see which one gives you a larger deduction. Standard mileage rate - For the standard mileage rate for the cost of operating your car for business, refer to Standard mileage rates for 2023, Publication 463, Travel, Entertainment, Gift, and Car Expenses. To use the standard mileage rate, you must own or lease the car and: You must not operate five or more cars at the same time, as in a fleet operation. You must not have claimed the special depreciation allowance on the car, and You must not have claimed a depreciation deduction for the car using any method other than straight-line. But what is new is the return of 100% bonus depreciation, which may allow you to write off up to 100% of the purchase price even if you financed it. For example, a truck driver that put $20,000 down to purchase a $200,000 truck could get a deduction against the full value of the vehicle, which might save them $74,000 in taxes even though they only put $20,000 down. Plus, they will still be able to write off all of their other vehicle expenses like their gas, oil, repairs, maintenance, insurance, and annual registration fees. So if you use a vehicle to operate your trade or business in any way, look into these rules or comment 'cars' below if you want my step-by-step guide on how to qualify for this deduction.