Your car is one of your business's biggest assets — and one of its biggest expenses. Whether you're a contractor driving between job sites, a consultant visiting clients, or an e-commerce seller making supply runs, the IRS lets you deduct the business use of your vehicle. But how you calculate that deduction makes a difference of thousands of dollars.
There are two methods: the standard mileage rate and the actual expense method. Choosing the wrong one — or failing to document your miles — can cost you serious money or trigger an IRS audit.
This guide breaks down both methods with real calculation examples, explains exactly what counts (and doesn't count) as business mileage, and shows you how to set up a bulletproof documentation system.
The IRS adjusts the standard mileage rate annually based on fuel costs, insurance, and vehicle maintenance trends:
Note: The IRS announces each year's rate in mid-December of the prior year. Always verify the current rate at IRS.gov before filing.
Let's compare both methods for a business owner who drove 10,000 business miles in a vehicle used 75% for business:
Just track miles • No receipts for gas/repairs • Covers all vehicle costs
Receipts required • More record-keeping • Potentially larger
💡 In This Example: The actual expense method produced a $425 larger deduction ($7,125 vs $6,700). For vehicles with high depreciation (new purchases) or heavy fuel costs, actual often wins. For fuel-efficient or older vehicles, standard mileage frequently comes out ahead — and is dramatically simpler.
The #1 mistake business owners make is counting commuting miles as business miles. Here's the breakdown:
With a qualifying home office, this is business mileage from your principal workplace to a client location.
Driving between business locations during the workday.
Business errands like buying supplies, going to the bank, or picking up inventory.
Local driving during an overnight business trip.
This is commuting — never deductible, regardless of distance or traffic.
Personal errands are never business mileage, even if you stop on the way back from a client.
Personal travel mixed with occasional business conversation doesn't qualify.
⚠ The Commuting Rule: Driving from home to your regular workplace is never deductible. Business mileage starts after you reach your first business destination. If you have a qualifying home office as your principal place of business, ALL trips from that office to business locations become deductible — this is one of the biggest reasons to claim the home office deduction.
The IRS requires "adequate records" to support your vehicle deduction. Here's what you need:
Every business trip needs a date and where you went. Mileage apps capture this automatically via GPS.
Why was this trip for business? "Met with client ABC to discuss project" is sufficient. Note this at the time of the trip.
Record your starting odometer at the beginning of the year and ending at year-end. Apps or a simple note works.
If using the actual expense method, keep receipts for gas, repairs, insurance, registration, and other vehicle costs.
📱 Recommended Apps: MileIQ, Everlance, Hurdlr, and QuickBooks' built-in mileage tracker all automatically detect trips via GPS, let you classify with one swipe, and generate IRS-ready reports. Most have free tiers for sole proprietors.
Different vehicle types have different deduction opportunities:
Depreciation capped (~$20,200 year 1). Standard mileage often works best for fuel-efficient models.
May qualify for Section 179 & bonus depreciation — potentially deduct most of purchase price in year 1.
Section 179 capped at ~$30,500 year 1, plus bonus depreciation on remainder.
If over 6,000 lbs GVWR and used >50% for business, full Section 179 available.
Eligible for standard mileage rate if used for business, though special rules apply.
Deduct business-use portion of lease payments. Watch for "inclusion amounts" on expensive leases.
| Scenario | Deductible? | Notes |
|---|---|---|
| Driving to meet a client at their office | ✓ Yes | Business mileage — log the trip and purpose |
| Driving from home to your regular office | ✗ No | Commuting is never deductible |
| Driving between two job sites | ✓ Yes | Business mileage between work locations |
| Driving to the airport for a business trip | ✓ Yes | From office or qualifying home office |
| Parking meters during business meetings | ✓ Yes | Separate from mileage — keep receipts |
| Driving to a personal doctor appointment | ✗ No | Personal mileage, never deductible |
| Driving to a business conference (from office) | ✓ Yes | Educational business expense travel |
| Weekend drive to visit family (even if you "think about work") | ✗ No | Personal travel doesn't become business by discussing work |
Here's a quick framework for deciding between standard mileage and actual expenses:
💡 Pro Tip — Run Both Calculations: There's no rule against calculating both methods and choosing whichever produces the larger deduction (you just can't claim both). Our monthly bookkeeping service tracks your mileage AND expenses simultaneously, so at tax time we simply apply whichever method saves you more money.
Tracking every business mile, categorizing vehicle expenses, and calculating both deduction methods is exactly the kind of detail work our team excels at. We ensure every deductible mile is captured, every vehicle expense is properly categorized, and you claim the method that maximizes your tax savings.
If past vehicle expenses are undocumented or your records are incomplete, our catch-up bookkeeping service can help reconstruct and organize your vehicle deductions. For more on what else you can write off, see our complete business expense checklist and guide to categorizing business expenses.
Ready to stop guessing and start saving? Contact CountRights today for a free consultation.