Business Use of a Personal Vehicle: Standard Mileage Rate vs. Actual Expenses

By Yarik Yarosh, CPA ·September 5, 2026 ·3 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

A business owner who uses a personal vehicle for business purposes can deduct the business-use portion of vehicle expenses. The IRS provides two methods: the standard mileage rate and the actual expense method. The choice affects how much you deduct, what records you keep, and what happens when you sell or trade in the vehicle.

✓Key takeaway

Standard mileage rate (2025):

70 cents per mile for business use
Includes gas, oil, insurance, registration, repairs, and depreciation
Does NOT include parking fees and tolls (deducted separately)
Requires a mileage log: date, destination, business purpose, and odometer readings
Must be elected in the FIRST YEAR the vehicle is used for business
Can’t be used if you claimed Section 179 or bonus depreciation on the vehicle
Can’t be used for a fleet of 5+ vehicles used simultaneously

Actual expense method:

Deduct the business-use percentage of ALL vehicle costs: gas, oil, insurance, registration, repairs, tires, lease payments (or depreciation if owned), car washes, parking
Business-use percentage = business miles / total miles
Requires tracking ALL expenses AND keeping a mileage log
Depreciation component is subject to luxury auto limits (GVWR < 6,000 lbs)
More complex record-keeping but often produces a larger deduction for expensive vehicles

Which method produces a larger deduction?

Hypothetical example

Round numbers. A consultant drives a personal vehicle 20,000 total miles per year, of which 15,000 are business miles (75% business use). The vehicle cost $35,000 and is 2 years old.

Standard mileage rate:

15,000 business miles x $0.70 = $10,500
Plus parking and tolls: $600
Total deduction: $11,100

Actual expense method:

Gas: $3,600 ($300/month)
Insurance: $1,800
Registration: $200
Maintenance/repairs: $1,200
Car wash: $240
Depreciation (limited by luxury auto rules): $5,760 (Year 3 MACRS for passenger auto)
Total vehicle expenses: $12,800
Business-use percentage: 75%
Deductible amount: $12,800 x 75% = $9,600
Plus parking and tolls: $600
Total deduction: $10,200

In this example, the standard mileage rate ($11,100) produces a larger deduction than actual expenses ($10,200). This is common for moderate-cost vehicles with high mileage.

When actual expenses win: For a $60,000 SUV with GVWR over 6,000 lbs (no luxury auto depreciation cap), the Year 1 depreciation alone (Section 179 or bonus) would be $60,000 x 75% business use = $45,000, far exceeding the mileage rate deduction.

Illustrative numbers only, not a real client and not advice for your facts.

What records does the IRS require?

Under IRC 274(d), vehicle expenses are subject to strict substantiation requirements. The taxpayer must maintain a contemporaneous record (log) of:

Date of each business trip
Destination (name and address of the client, job site, or business location)
Business purpose (client meeting, supply pickup, job site visit)
Mileage (odometer start and end, or trip mileage)

The IRS doesn’t accept estimates, reconstructed logs, or calendar-based approximations as substantiation. A mileage tracking app (MileIQ, Everlance, Hurdlr) that records trips automatically with GPS satisfies the contemporaneous requirement.

Without a log, the entire vehicle deduction is disallowed on audit. This is one of the most commonly adjusted items in IRS examinations of Schedule C filers.

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Cite this page

Yarik Yarosh, CPA. "Business Use of a Personal Vehicle: Standard Mileage Rate vs. Actual Expenses." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-business-use-personal-vehicle

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.