Mileage on Schedule C (Self-Employed)

Who files Schedule C

Schedule C — "Profit or Loss From Business" — is the form sole proprietors and single-member LLCs use to report business income and expenses on their personal return (Form 1040). If you're self-employed, an independent contractor, a freelancer, a gig worker, or a sole-proprietor side business, your vehicle deductions almost certainly belong here.

Partners in partnerships and members of multi-member LLCs report differently (Form 1065 / K-1 / Schedule E). Single-member LLCs that elected S-corp treatment also report differently. This article is about Schedule C specifically — the most common case.

Where vehicle expenses live on Schedule C

Schedule C has a dedicated section for vehicle expenses (Part IV in recent years' forms). The form asks for:

• The date you placed the vehicle in service for the business — usually the date you started using it for business work.
• Total miles for the year, broken into business, commuting, and other (personal).
• Whether the vehicle was available for personal use outside of business hours.
• Whether you have evidence to support your deduction — and whether that evidence is written.
• Whether you used the standard mileage rate or actual expenses.

The "Yes" answers to evidence questions are not optional. If you check "No," you've told the IRS you can't substantiate the deduction — which is an audit invitation.

The standard rate calculation, end to end

Multiply your business miles by the IRS standard rate for the year. That's the deduction. Don't include commuting miles. Don't include personal miles. Don't include miles you can't substantiate.

Example: 12,000 business miles × $0.70/mi = $8,400 deduction. That's a direct reduction in your business's net income, which reduces both income tax and self-employment tax.

Common Schedule C mileage mistakes

• Including commuting. Travel from home to a regular office is personal commuting, not business mileage — even if you're self-employed. The exception is travel from a qualifying home office to a work location: that's business.
• Counting all miles on a mixed-use vehicle. If 60% of the year's miles were business, only 60% deducts. The standard rate handles this naturally because you only multiply business miles; actual expenses requires a percentage calculation.
• Round-numbering the log. An IRS examiner who sees "150 miles" and "200 miles" written every week, all year, knows the log was reconstructed. Real driving doesn't produce round numbers.
• Forgetting Section 179 limits. If you took a Section 179 deduction or accelerated depreciation in year one under actual expenses, that locked the vehicle in. You can't switch to standard later. Many CPAs run this calculation in the wrong direction.

Home-office mileage

If you have a qualifying home office — a space used regularly and exclusively for business — your trips from there to client sites, supply runs, post office, and other business destinations count as business mileage from the start. Without a qualifying home office, those same trips might be commute-then-business, where the first leg is non-deductible commuting.

This is a real planning lever. If you work from home and don't claim a home office, you may be giving up business mileage on every trip out. The home-office rules are strict (regular and exclusive use), but the mileage benefit alone often justifies the work.

Self-employment tax matters too

Schedule C net income flows to Schedule SE, which calculates self-employment tax (Social Security and Medicare for the self-employed) at 15.3% up to the SS wage base. A larger mileage deduction reduces both your income tax and your SE tax — so the same $8,400 deduction is worth more to a Schedule C filer than to most W-2 filers, dollar for dollar.

Recordkeeping the IRS expects

For each business trip: date, destination, business purpose, and miles. Recorded contemporaneously — at the time of the trip, not reconstructed at year-end. Plus odometer readings at the start and end of the year so the totals can be cross-checked against your trip log.

This is exactly what AutoDrive captures automatically: every trip's date, route, miles, and (after a one-tap classification) purpose. End-of-year mileage report exports as PDF or CSV in Schedule C-friendly format.

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