I Am Self-Employed. Can I Expense My Car and Home Office?
Two of the most-searched tax questions for the self-employed — and the answer to both is "sometimes, if you follow the rules." Here's exactly what the IRS requires, and how much attention each deduction actually draws.
By Sanjay Pamurthy, CFP® & Devin Talbot, MBA | Artham Advisors | July 2026
Quick Answer: Yes — if you're self-employed (1099 income, your own practice, or a business you own), you can deduct your home office and vehicle expenses, but only if you follow specific IRS rules. A home office must be used regularly and exclusively for business and be your principal place of business. Vehicle expenses can be deducted using the standard mileage rate (72.5 cents per mile for 2026) or the actual expense method, but commuting never counts. W-2 employees can't take either deduction under current law. Both are legitimate deductions that won't trigger an audit by themselves — poor documentation and unreasonable percentages are what raise flags, not the deductions themselves.
1.
Why These Are the Two Most-Searched Deductions
If you search "can I deduct my home office" or "can I write off my car," you'll find a mountain of conflicting answers. That's because the real answer depends entirely on how you're paid. If you're self-employed — 1099 income from locums work, consulting, expert witness work, or your own practice — the answer to both questions is yes, within specific IRS rules. If you're a W-2 employee, the answer to both is generally no: tax reform suspended the deduction for unreimbursed employee business expenses, and under current law it hasn't come back for W-2 wage earners.
Many physicians sit in both categories at once — a W-2 hospital employee who also does 1099 locums, telehealth, or consulting work on the side. In that case, the deductions below apply only to the 1099 side of your income, not your W-2 job.
2.
The Home Office Deduction: What the IRS Actually Requires
To deduct a home office, the space has to pass a two-part test: you must use it regularly and exclusively for your business, and it must be your principal place of business — or the place you regularly meet patients or clients, or a separate structure used for business. "Regularly and exclusively" is a high bar: checking email or reviewing charts at the kitchen table doesn't count, and a guest room that doubles as an office on weekends generally doesn't either.
Method | How It Works |
|---|---|
Regular (actual) method | Multiply the percentage of your home used for business by your actual home expenses — mortgage interest, utilities, insurance, depreciation, and repairs. Often larger, but requires more documentation |
Simplified method | $5 per square foot of office space, up to 300 square feet — a maximum deduction of $1,500, with minimal recordkeeping |
3.
Three Ways Deferral Can Backfire
Vehicle expenses work similarly — two calculation methods, and one rule that surprises almost everyone: your regular commute is never deductible, even if you're self-employed.
Method | How It Works |
|---|---|
Actual expense method | Track your actual costs (gas, insurance, repairs, depreciation) and deduct the percentage that matches your business use. More paperwork, but can produce a larger deduction for an expensive or heavily-used vehicle.
|
Standard mileage rate | A flat rate per business mile — 72.5 cents per mile for 2026 — covering gas, maintenance, insurance, and depreciation in one number. You must choose this method in the first year you use the vehicle for business. |
What counts as business mileage: driving between job sites, to see patients, to meetings, or to buy business supplies. What doesn't: your ordinary commute from home to your regular workplace — that's personal mileage no matter how self-employed you are. The one exception is if your home qualifies as your principal place of business under the rules above; in that case, trips from home to other work locations can count as business mileage rather than commuting.
Whichever method you use, the IRS expects a contemporaneous mileage log — date, miles driven, and business purpose for each trip. A phone app that logs trips automatically is far more defensible than an end-of-year estimate.
4.
Audit Risk: What Actually Draws Attention
Both deductions have a reputation for triggering audits that's largely outdated. Claiming a home office or vehicle deduction does not, by itself, put your return in a special review queue. What actually raises your audit risk — measured by the IRS's scoring system, which compares your return to others with a similar profile — is claiming something unusual relative to your peers.
HOME OFFICE, OVERSIZED: Claiming that 40% or more of a small apartment is a dedicated office, or that your home office deduction represents an unusually large share of your income relative to similar businesses, is more likely to draw a second look than the deduction itself.
VEHICLE, 100% BUSINESS USE: Claiming that a personal vehicle is used 100% for business is one of the more common and most easily flagged patterns — the IRS knows almost no one drives a car exclusively for work.
W-2 EMPLOYEES CLAIMING EITHER DEDUCTION: If you are audited, the deduction rarely gets denied outright — a missing mileage log or inconsistent square-footage claim is what causes it to fall apart.
MISSING RECORDS, NOT THE DEDUCTION ITSELF: Depreciation recapture on real estate is taxed at sale, generally at a rate up to 25% federally. It's usually still a favorable trade, but it's a partial offset, not a free deduction.
Bottom line: Both deductions are legitimate, valuable, and won't put a target on your back by themselves. What increases risk is claiming an unreasonable percentage or failing to keep contemporaneous records. Claim what you're entitled to, document it as you go, and you're on solid ground.
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Not sure which deductions you actually qualify for?
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Frequently Asked Questions
Generally, no. Under current law, the home office deduction is available only to self-employed individuals, contractors, and business owners — W-2 employees cannot deduct unreimbursed home office expenses, even if their employer requires them to work from home.
The simplified method deducts $5 per square foot of office space, up to 300 square feet, for a maximum deduction of $1,500. The regular (actual) method multiplies the percentage of your home used for business by your actual home expenses — mortgage interest, utilities, insurance, depreciation, and repairs — which requires more documentation but can produce a larger deduction.
The standard mileage rate (72.5 cents per mile for 2026) is simple and requires only a mileage log. The actual expense method tracks real costs — gas, insurance, repairs, depreciation — multiplied by your business-use percentage. Standard mileage is usually easier; actual expenses can be larger for an expensive or heavily-used vehicle, but requires much more recordkeeping.
No. Your regular commute from home to your primary workplace is personal mileage, not business mileage, regardless of whether you're self-employed. The exception is if your home office qualifies as your principal place of business — in that case, trips from home to other work locations can count as deductible business mileage.
Claiming the deduction alone does not trigger an audit. What raises risk is claiming an unusually large percentage of your home as office space, or a home office deduction that's large relative to your income compared to similar businesses. A W-2 employee claiming the deduction is an automatic mismatch the IRS's system is built to catch.
Yes. The IRS expects a contemporaneous log recording the date, miles driven, and business purpose of each trip, regardless of which deduction method you use. A phone app that tracks trips automatically is far more defensible in an audit than an end-of-year estimate.
Further Reading & Sources
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IRS.gov: Simplified Option for Home Office Deduction
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IRS.gov: Topic No. 509 — Business Use of Home
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IRS.gov: IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile
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White Coat Investor: Home Office Tax Deduction
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White Coat Investor: Controversial and Aggressive Tax Deductions
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Physician on FIRE: Tax Reform! How Physicians and the Self-Employed Are Affected
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Bogleheads Wiki: Tax Basics
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Disclosure: This article is for educational purposes only and does not constitute personalized financial, legal, or tax advice. Tax rates, thresholds, and rules referenced here reflect 2026 figures and are subject to change; consult a qualified CPA or tax attorney about your specific situation. Artham Advisors LLC is a registered investment adviser (SEC disclosure). Registration does not imply a certain level of skill or training. Past performance is not indicative of future results. © 2026 Artham Advisors.