Business usage %

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My business usage % vary each year. Do I use an average annual % in computing gain and loss basis or do I take the % computed by dividing the total of business miles for all years by the total miles drove? Thank you.

JohnB5677

Alumni - Intuit

Yes, you would calculate the mileage percentage by dividing business mile by the total miles driven.

The IRS requires you to maintain a log of business miles driven.

The log should include

Date
Location
Miles driven and
Reason

If requested, the IRS would expect this documentation to confirm the miles driven.

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Business usage %

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