Rule Atlas
IRC § 280F: Deducting Business Vehicle Expenses: Standard Mileage vs. Actual Costs
Under IRC § 280F (IRS / Treasury Circular 230), deducting Business Vehicle Expenses: Standard Mileage vs. Actual Costs establishes the authoritative rules tested on the IRS Enrolled Agent (EA). Master the rules for deducting business vehicle expenses for sole proprietorships and other business entities. VoraPrep verifies every threshold, worked table, and practice question below against the current IRS Enrolled Agent (EA) blueprint.
Current Statutory Thresholds & Limits in Effect
Dollar-for-dollar reduction above $4,000,000 placed in service; limited to taxable income from active trades or businesses.
Can create or increase a Net Operating Loss (NOL), unlike IRC §179.
Method 1 vs. Method 2: Standard Mileage vs. Actual Expenses
| Feature | Standard Mileage Rate | Actual Expense Method |
|---|---|---|
| Calculation | (Business Miles × $0.67) + Parking/Tolls | (Total Actual Expenses) × Business Use % |
| Recordkeeping | Requires a log of business miles, date, and purpose. | Requires receipts for all expenses AND a mileage log. |
| Depreciation | Component is built into the rate. No separate deduction. | Depreciation is calculated and deducted separately. |
| Lock-In Rule | Can switch to Actual Expense method in a later year (but must use straight-line depreciation). | If accelerated depreciation is used first, you cannot switch to Standard Mileage for that vehicle. |
Javier is a self-employed consultant who uses his personal car for business. In 2025, he drove 12,000 business miles and elects to use the standard mileage rate for his vehicle deduction. He also incurred the following vehicle-related costs during the year: Gasoline: $2,800 Vehicle insurance: $1,500 Repairs and maintenance: $700 Parking fees and tolls for business trips: $450 In addition to the deduction calculated using the standard mileage rate, what amount can Javier deduct for these vehicle-related expenses on his Schedule C?
The Cornerstone Calculation: Business Use Percentage
Regardless of the deduction method, the Business Use Percentage (BUP) is fundamental. The IRS is vigilant about taxpayers deducting personal vehicle use as a business expense. This percentage separates the two.
- The Formula: Business Use Percentage = (Total Business Miles for the Year / Total Miles Driven for the Year)
- For example, if a taxpayer drove 25,000 total miles and 20,000 of those were for business, the business use percentage is (20,000 / 25,000) = 80%.
- Defining Business vs. Personal Miles: Business Miles: Travel between two business locations (e.g., from your office to a client's site), visiting customers, or going to a business meeting away from your regular workplace. Commuting Miles: Travel between your home and your main or regular place of work. These are considered personal miles and are never deductible. Other Personal Miles: Any other driving for non-business purposes.
Common IRS Enrolled Agent (EA) Distractors on IRC § 280F
- 1Every business vehicle question on the SEE follows the same underlying structure. Use this 5-step decision framework and you'll rarely miss one:
- 2To remember the four essential elements for substantiating vehicle expenses under IRC §274(d), use the memory aid DATE:
- 3Address (Place or destination of travel)
- 4Explanation (Business purpose of the trip)
- 5Two Methods: Taxpayers choose between the simplified Standard Mileage Rate ($0.67/mile for 2025) and the more complex Actual Expense Method, with the initial choice having long-term implications.
Frequently Asked Questions: IRC § 280F
What is the core rule under IRC § 280F (Deducting Business Vehicle Expenses: Standard Mileage vs. Actual Costs)?
Under IRC § 280F (IRS / Treasury Circular 230), deducting Business Vehicle Expenses: Standard Mileage vs. Actual Costs establishes the authoritative rules tested on the IRS Enrolled Agent (EA). Master the rules for deducting business vehicle expenses for sole proprietorships and other business entities. VoraPrep verifies every threshold, worked table, and practice question below against the current IRS Enrolled Agent (EA) blueprint.
How is IRC § 280F tested on the IRS Enrolled Agent (EA)?
Every business vehicle question on the SEE follows the same underlying structure. Use this 5-step decision framework and you'll rarely miss one: To remember the four essential elements for substantiating vehicle expenses under IRC §274(d), use the memory aid DATE:
Where can I practice IRS Enrolled Agent (EA) questions on Deducting Business Vehicle Expenses: Standard Mileage vs. Actual Costs?
Test yourself instantly with the free playable IRS Enrolled Agent (EA) question on this page, or launch VoraPrep's full IRS Enrolled Agent (EA) adaptive question bank, interactive lessons, and 1:1 exam simulator at voraprep.com/ea-prep.