IRS Standard Mileage Rate 2026 and Fleet Mileage Records

Vehicle costs are one of the largest line items for a small fleet, so the tax rules deserve a careful read. This guide uses the IRS’s own pages, checked on October 31, 2026. It’s education only; a CPA or enrolled agent can tell you which method fits your business.

What is the IRS mileage rate for 2026?

The IRS split 2026 into two periods (IRS: Standard mileage rates):

• January 1 to June 30, 2026: 72.5 cents per mile for business use, up 2.5 cents from 2025 (IRS news release IR-2025-128).
• July 1 to December 31, 2026: 76 cents per mile for self-employed and business use.

The IRS says the rates apply to fully electric and hybrid automobiles as well as gasoline and diesel-powered vehicles (IRS 2026 mileage release). Its tax topic on car expenses cites Announcement 2026-11 for the mid-year change (IRS Topic 510).

Can a fleet use the standard mileage rate?

This is the rule many growing fleets miss. IRS Publication 463 lists, among the cases where you can’t use the standard mileage rate, when you “Use five or more cars at the same time (such as in fleet operations)”. It explains:

If you own or lease five or more cars that are used for business at the same time, you can’t use the standard mileage rate for the business use of any car. However, you may be able to deduct your actual expenses for operating each of the cars in your business.

Publication 463 also explains that alternating cars (using them at different times) is treated differently from using them at the same time. So a business with two or three vans may be able to choose between methods, while one running five or more at the same time looks at actual expenses. Publication 463 lists other cases where the standard rate isn’t allowed, such as after claiming certain depreciation or a section 179 deduction on that car.

How do the two methods compare?

• Standard mileage rate: business miles times the IRS rate, plus business parking fees and tolls. The IRS says that for a car you own, you must choose it in the first year the car is available for use in your business, and that for a leased vehicle you must use it for the entire lease period, including renewals.
• Actual expenses: the business share of costs such as gas, oil, repairs, tires, insurance, registration, lease payments or depreciation (IRS Topic 510).

The IRS says that if you qualify to use both methods, you may want to figure your deduction both ways before choosing.

What mileage records does the IRS want?

Publication 463 asks you to keep records such as the cost of the car, the date you started using it for business, the mileage for each business use and the total miles for the year, along with the date of each use, your business destination and the business purpose. On timing, it says:

You should record the elements of an expense or of a business use at or near the time of the expense or use and support it with sufficient documentary evidence.

It adds that if you maintain a log on a weekly basis that accounts for use during the week, the log is considered a timely kept record. A paper log in the glove box, a spreadsheet or an app export can all work if they capture those elements. For record retention in general, see the IRS recordkeeping page.

Can GPS or telematics data be the mileage log?

Trip data from a telematics system can help build the log, but the IRS elements still apply, including business purpose, which a GPS track doesn’t know. If you use telematics, export the data regularly and add the purpose. See how to compare telematics.