Why are there two rates?

The IRS sets the rate for a year and occasionally changes it part-way through. When it does, miles are counted at the rate in force on the day they were driven, which is why a log needs dates. If the rate did not change, enter the same figure twice.

Is the deduction the amount of tax I save?

No. A deduction lowers the income that is taxed. What it saves depends on your tax rate, and is a fraction of the deduction.

Salary & pay

Mileage deduction calculator

Business miles turned into a deduction at the standard rate, with room for a year that has two rates.

Business miles, first part of the year

Driven before the rate changed.

Business miles, rest of the year

Driven after the rate changed. Enter 0 if it did not.

Enter the mileage rates to see a result. The fields start empty because these are the government’s figures to publish, not ours, and we have not yet checked them against the source ourselves. They are on IRS — Standard mileage rates.

Standard mileage rates

Rate, first part of the year

Cents per business mile, on the IRS page of standard mileage rates.

Rate, rest of the year

The same page. If the rate did not change during the year, enter the same figure.

Questions

Why are there two rates?: The IRS sets the rate for a year and occasionally changes it part-way through. When it does, miles are counted at the rate in force on the day they were driven, which is why a log needs dates. If the rate did not change, enter the same figure twice.
Is the deduction the amount of tax I save?: No. A deduction lowers the income that is taxed. What it saves depends on your tax rate, and is a fraction of the deduction.

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