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: If a car is used for both business and personal trips, you may only deduct the portion of costs attributed to business use.

: Use Form 2106 (or 2106-EZ) and itemize on Schedule A. Self-Employed : Deduct expenses on Schedule C (Form 1040). Farmers : Use Schedule F (Form 1040). : If a car is used for both

: You multiply the business miles driven by a set IRS rate. This requires you to choose this method in the first year the car is available for business use. : If a car is used for both

: You must maintain adequate records or evidence to support your statement of expenses. : If a car is used for both

For more detailed guidance, refer to IRS Publication 463 regarding travel and car expenses.