HOW-TO GUIDE
How to Deduct Vehicle Expenses — Mileage vs. Actual Cost Guide 2026
Step-by-step guide to vehicle expense deductions — standard mileage rate vs. actual cost method, mileage log requirements, Section 179 and bonus depreciation for vehicles.
Vehicle Deduction Methods: Standard Mileage vs. Actual Cost
Business vehicle expenses are deductible under two methods: (1) the standard mileage rate method — multiply business miles by the IRS standard mileage rate ($0.70 per mile for 2024; $0.70 per mile for 2025; check IRS.gov for the 2026 rate); or (2) the actual cost method — deduct actual vehicle expenses (gas, insurance, repairs, depreciation) multiplied by the business use percentage. The method that produces the larger deduction depends on the vehicle's value, fuel efficiency, and business use percentage.
The standard mileage rate method is simpler (requires only a mileage log) and is often better for high-mileage, low-value vehicles. The actual cost method is often better for expensive vehicles, SUVs over 6,000 lbs (which qualify for Section 179 and bonus depreciation), and vehicles with high fuel and maintenance costs. You must choose the method in the first year the vehicle is placed in service — you cannot switch from actual cost to standard mileage after the first year.
| Method | Documentation Required | Best For | 2025 Rate/Limit |
|---|---|---|---|
| Standard Mileage Rate | Contemporaneous mileage log | High-mileage, low-value vehicles | 70 cents/mile |
| Actual Cost Method | All receipts + mileage log for business % | Expensive vehicles, SUVs | Actual expenses × business % |
| Section 179 (IRC §179) | Purchase documentation | SUVs > 6,000 lbs GVWR | $28,900 limit for SUVs (2025) |
| Bonus Depreciation (IRC §168(k)) | Purchase documentation | Vehicles placed in service 2025 | 40% for 2025 |
| MACRS Depreciation | Purchase documentation | Passenger vehicles | Luxury auto limits apply |
Mileage Log Requirements
The IRS requires a contemporaneous mileage log that records: (1) the date of each business trip; (2) the destination (city and business name); (3) the business purpose; and (4) the miles driven. 'Contemporaneous' means recorded at the time of the trip, not reconstructed later. A mileage log created after the fact is much weaker than one created in real time.
Recommended mileage tracking apps: MileIQ (automatic tracking, $59.99/year); Everlance (automatic tracking, free for 40 trips/month); TripLog (automatic tracking, $59.99/year); Stride (free, designed for gig workers). These apps use GPS to automatically track trips and allow you to swipe to categorize each trip as business or personal. The app generates a mileage report that can be exported for tax purposes.
The IRS does not require a specific format for the mileage log — any contemporaneous record that shows the required information is acceptable. A paper log, a spreadsheet, or a mileage tracking app all qualify. The key is that the record is created at the time of the trip.
Section 179 and bonus depreciation is 100% permanent (OBBBA restored it) from 60% in 2024 to 20% in 2026).
Example: A self-employed contractor purchases a $65,000 pickup truck (GVWR over 6,000 lbs) in 2025 with 90% business use. Section 179 deduction: $28,900 × 90% = $26,010. Bonus depreciation on remaining basis: ($65,000 × 90% - $26,010) × 40% = $16,596. Total first-year deduction: $42,606. Compare to standard mileage rate: if the truck is driven 25,000 business miles, the deduction is $17,500 (25,000 × $0.70). The actual cost method is clearly superior for this vehicle.
Passenger vehicles (GVWR 6,000 lbs or less) are subject to luxury auto limits under IRC §280F. For 2025, the first-year depreciation limit for passenger vehicles is $12,400 (with bonus depreciation) or $3,960 (without bonus depreciation). These limits significantly reduce the deduction for expensive passenger cars.
Case Study: $42,600 Deduction on a Pickup Truck
James, a self-employed plumber, purchased a $65,000 Ford F-250 (GVWR 8,500 lbs) in March 2025. Business use: 85%. His practitioner calculated: Section 179 = $28,900 × 85% = $24,565. Bonus depreciation (40%) on remaining basis: ($65,000 × 85% - $24,565) × 40% = $12,276. Total 2025 deduction: $36,841. Tax savings at 32% marginal rate: $11,789. If James had used the standard mileage rate (30,000 business miles × $0.70 = $21,000), the deduction would have been $14,159 less — a $4,531 difference in tax savings.
Client Conversation Script
Client: 'I use my car for work. Can I deduct it?' Practitioner: 'Yes — but we need to decide between the standard mileage rate and the actual cost method. The standard mileage rate is simpler — you multiply your business miles by $0.70 per mile. The actual cost method deducts your actual gas, insurance, repairs, and depreciation based on your business use percentage. For most clients with a regular car, the standard mileage rate is easier and often produces a similar deduction. But if you have an SUV or pickup truck over 6,000 lbs, the actual cost method with Section 179 can produce a much larger deduction. What kind of vehicle do you have?'
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Apply to Join the Marketplace →Frequently Asked Questions
The IRS standard mileage rate for business use of a vehicle is $0.70 per mile for 2025 (up from 67 cents in 2024). The IRS announces the rate for 2026 in December 2025 — check IRS.gov for the current rate.
No — if you use the standard mileage rate in the first year the vehicle is placed in service, you can switch to the actual cost method in a later year. However, if you use the actual cost method (including Section 179 or bonus depreciation) in the first year, you cannot switch to the standard mileage rate in a later year.
Vehicles with a GVWR over 6,000 lbs that are NOT classified as SUVs (e.g., pickup trucks with a cargo bed at least 6 feet long, vans rated over 6,000 lbs) qualify for the full Section 179 deduction without the $28,900 SUV limit. The full Section 179 limit for 2025 is $1,160,000.
For the standard mileage rate: a contemporaneous mileage log showing date, destination, business purpose, and miles driven. For the actual cost method: all receipts for gas, insurance, repairs, and maintenance; plus a contemporaneous mileage log to establish the business use percentage.
Passenger vehicles (GVWR 6,000 lbs or less) are subject to luxury auto limits under IRC §280F. For 2025, the first-year depreciation limit is $12,400 (with bonus depreciation) or $3,960 (without bonus depreciation). These limits apply regardless of the vehicle's actual cost.
No — commuting miles (from home to your regular place of business) are not deductible. Business miles (between business locations, to client sites, to temporary work locations) are deductible. If you have a home office that qualifies as your principal place of business, all miles from home to client sites are deductible.
The Section 179 deduction for SUVs (vehicles with a GVWR over 6,000 lbs that are classified as SUVs) is limited to $28,900 for 2025 (indexed for inflation). This limit does not apply to pickup trucks with a cargo bed at least 6 feet long or vans rated over 6,000 lbs.
The information on this page is intended for licensed tax professionals (CPAs, EAs, and tax attorneys) and is provided for educational and research purposes only. Tax law is complex and fact-specific — all strategies discussed are subject to limitations, phase-outs, and conditions that may not apply to every client situation. Practitioners should independently verify all information against current IRS guidance, Treasury Regulations, and applicable state law before advising clients. This content does not constitute legal or tax advice.
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