Mileage Deduction
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It's calculated by multiplying the number of business (or otherwise deductible) miles driven by a standard rate per mile set by the tax authority for that year, giving you the total dollar amount that can be deducted.

Tax authorities typically adjust the standard mileage rate periodically to reflect changes in the average cost of operating a vehicle, including fuel prices, maintenance, insurance, and depreciation — always confirm you're using the current rate for the specific year and jurisdiction in question.

Rules vary by jurisdiction and purpose (business, medical, moving, or charitable mileage are common categories, sometimes with different rates), but generally a regular commute from home to a fixed workplace does not qualify — deductible mileage usually covers travel between work locations, client visits, or other business-related trips beyond an ordinary commute.

Generally not for the same vehicle and period — most tax systems require you to choose between the standard mileage rate method (a simplified per-mile deduction) or the actual expense method (tracking real costs like fuel, depreciation, and repairs), not a combination of both for the same trips.

You should keep a contemporaneous log recording the date, purpose, starting/ending locations, and mileage for each trip, since tax authorities generally require this documentation to substantiate a mileage deduction if your return is reviewed.