Home Office Deduction

The home office deduction is the most misunderstood write-off in the tax code. It’s not an audit trigger by itself — the IRS has largely automated the process. But you do need to meet two requirements: regular and exclusive use, and principal place of business, as defined in IRC Section 280A.

Simplified Method

The easy route. You take $5 per square foot of your home office, up to 300 square feet. Maximum deduction: $1,500. No depreciation calculations, no utility tracking, no Form 8829. Just measure your office space and multiply.

The simplified method works great if your home office is small. But if you live in New York City and your office takes up 25% of a $3,500/month apartment, you’re leaving real money on the table at $1,500.

Actual Expense Method (Form 8829)

The actual expense method lets you deduct the business-use percentage of all home expenses: rent or mortgage interest, property taxes, utilities, insurance, internet, repairs, and depreciation. Calculate your office’s square footage as a percentage of your home’s total square footage, then apply that percentage to each expense.

A 200-square-foot office in a 1,000-square-foot apartment = 20% business use. If your total housing costs are $48,000/year (rent, utilities, internet, renter’s insurance), your deduction is $9,600. That’s six times what the simplified method gives you.

The “exclusive use” requirement means the space can’t double as a guest bedroom or kids’ playroom. A desk in your living room doesn’t count unless that section is used only for business. A dedicated room with a door — that’s the cleanest setup. We’ve seen clients partition open spaces with furniture and successfully defend the deduction, but a separate room is always safer. See IRS Publication 587 for full details.

Health Insurance Deduction

Self-employed individuals can deduct 100% of health insurance premiums for themselves, their spouse, and their dependents under IRC Section 162(l). This is an above-the-line deduction — you don’t need to itemize to claim it.

Qualifying premiums include medical, dental, and vision insurance, plus long-term care insurance (subject to age-based limits per IRS Publication 535). If you’re paying $800/month for a marketplace plan for your family, that’s a $9,600 annual deduction. At a 28% marginal rate, the deduction saves you $2,688 in income tax alone, plus it reduces your SE tax base.

One catch: you can’t claim this deduction for any month you were eligible for employer-sponsored health insurance (including through a spouse’s employer). If your spouse has a plan available at work that covers you, you’re ineligible for the self-employed deduction — even if you didn’t actually enroll in the spouse’s plan. What matters is eligibility, not enrollment.

Retirement Contributions: SEP-IRA and Solo 401(k)

This is where the big numbers live. Self-employed workers have access to retirement plans that can shelter enormous amounts of income from taxes.

SEP-IRA

You can contribute up to 25% of your net self-employment earnings (after the SE tax deduction adjustment), with a maximum of $70,000 for 2025. The contribution is fully deductible under IRC Section 408(k). Setup is simple — open an account at any brokerage, make your contribution by the tax filing deadline (including extensions), and deduct it.

On $150,000 of net SE income, a SEP-IRA contribution could be around $28,000-$30,000. That’s $28,000 you don’t pay income tax on this year. See our IRA comparison guide for more.

Solo 401(k)

Even more powerful. A Solo 401(k) lets you contribute as both employee and employer. The employee side: up to $23,500 (2025), or $31,000 if you’re 50 or older. The employer side: up to 25% of net SE earnings. Combined maximum: $70,000 (or $77,500 with catch-up).

The Solo 401(k) also offers a Roth option on the employee contribution side, which the SEP-IRA doesn’t. You pay tax now but get tax-free growth and withdrawals in retirement. For younger freelancers who expect to earn more later, the Roth option is compelling.

The downside: Solo 401(k)s must be established by December 31 of the tax year (though contributions can be made until the filing deadline). SEP-IRAs can be opened and funded right up to the filing deadline. If it’s March and you haven’t set up a plan yet, a SEP-IRA is your only option for last year.

Vehicle Expenses

If you drive for business, you have two options for deducting vehicle costs.

Standard Mileage Rate

For 2025, the IRS standard mileage rate is 70 cents per mile. Track your business miles, multiply by the rate, and that’s your deduction. Simple.

A freelance photographer driving 12,000 business miles per year gets roughly an $8,400 deduction. You still need a mileage log — date, destination, business purpose, and miles driven. An app like MileIQ or Everlance makes this painless. See our Schedule C car expenses guide for a deeper comparison.

Actual Expense Method

Track all vehicle expenses (gas, insurance, maintenance, depreciation, registration, lease payments) and deduct the business-use percentage. If you drove 15,000 total miles and 12,000 were business, that’s 80% business use. Apply that to your total vehicle costs.

The actual expense method tends to favor people who drive expensive vehicles or have high maintenance costs. The standard mileage rate favors people who drive fuel-efficient cars with low operating costs. Run both calculations your first year and see which comes out ahead.

One restriction: if you use the actual expense method in year one, you can switch to standard mileage later. But if you’ve claimed depreciation on the vehicle, you can’t switch. Choose carefully up front.

Phone and Internet

Your cell phone bill and home internet are deductible to the extent they’re used for business. If you use your phone 70% for business, you deduct 70% of the bill. Same for internet.

Most freelancers we work with estimate 60-80% business use for their phone and 50-70% for internet. Be honest with these percentages — claiming 100% business use on a personal cell phone is a red flag. You stream Netflix and text your friends on that phone too. 70% is reasonable for most people who genuinely use their phone heavily for work.

At $150/month for phone and $80/month for internet, a 70% business deduction gives you about $1,932 annually. Not huge individually, but these “small” deductions add up fast.

Business Meals

Business meals are 50% deductible per IRC Section 274 in 2025 (the temporary 100% deduction for restaurant meals expired after 2022). The meal must involve a business discussion — meeting a client, discussing a project with a contractor, or taking a prospective client to lunch.

Record the date, who was there, what you discussed, and the business purpose. A receipt alone isn’t enough. The IRS wants to know why the meal was business-related, not just that you ate food while self-employed.

Solo meals while traveling for business are also 50% deductible. You’re away from home overnight on a business trip and grab dinner alone? That counts. Buying lunch at your desk on a regular work day? That doesn’t.

Professional Development and Education

Courses, workshops, conferences, books, and training that maintain or improve skills in your current business are deductible under Treasury Regulation 1.162-5. A freelance developer taking a React course? Deductible. A CPA attending a tax update seminar? Deductible. A graphic designer buying a typography book? Deductible.

What doesn’t qualify: education that prepares you for a new career. If you’re a freelance writer who takes a nursing program, that’s not a business deduction. The education has to relate to your existing trade or business.

Conference travel is also deductible — registration fees, airfare, hotel, and meals (at 50%). If you attend a three-day industry conference in Chicago, the entire trip is a business expense as long as the primary purpose is business.

Software, Subscriptions, and Office Supplies

Every software subscription you use for business goes on Schedule C. Adobe Creative Cloud, QuickBooks, Slack, Zoom, project management tools, cloud storage, domain hosting, email marketing platforms — all deductible.

Office supplies are deductible too: printer ink, paper, pens, desk accessories, even your office chair and desk. Items over $2,500 might need to be depreciated rather than expensed in full (though Section 179 and bonus depreciation can let you expense larger items immediately). Under $2,500? Deduct the full cost in the year of purchase under the de minimis safe harbor.

Don’t forget bookkeeping and accounting software fees, legal fees for contract review, and professional liability insurance premiums. These are all ordinary and necessary business expenses under IRC Section 162.

Other Deductions Worth Remembering

• Business insurance: General liability, professional liability (E&O), and cyber liability premiums are fully deductible.
• Advertising and marketing: Website costs, Google Ads, social media advertising, business cards, and print materials.
• Bank fees: Monthly fees on your business bank account, credit card processing fees, and PayPal/Stripe transaction fees.
• Subcontractor payments: Money paid to other freelancers or contractors you hire for projects. Issue them a 1099-NEC if you pay $600 or more.
• Professional memberships: Dues for industry associations and professional organizations. Not social clubs.
• Shipping and postage: If you mail products, documents, or samples to clients.
• Depreciation: Computers, cameras, equipment, and furniture used for business. Section 179 lets you deduct the full cost in year one rather than spreading it over multiple years.

Record-Keeping: The Non-Negotiable

None of these deductions matter if you can’t prove them. The IRS requires adequate records — receipts, bank statements, mileage logs, and notes explaining the business purpose. We recommend:

• Separate bank account and credit card for business expenses. Mixing personal and business spending is the fastest way to lose deductions (or attract audit attention).
• Receipt capture app like Dext or Expensify. Take a photo when you get the receipt. By the time you need it at tax time, the paper version will be lost or faded.
• Monthly bookkeeping. Even 30 minutes a month categorizing expenses keeps you organized and ensures nothing slips through.
• Calendar notes for meals and travel. Who, what, where, why. A one-line note in your calendar entry is sufficient.

The IRS can disallow any deduction you can’t substantiate. A $15,000 home office deduction with no records of rent paid, utility bills, or office measurements? Gone. Don’t let lazy record-keeping cost you thousands. See IRS Publication 583 for the official record-keeping requirements.

Sources & References

• IRC Section 162 — Trade or Business Expenses
• IRC Section 280A — Disallowance of Certain Expenses in Connection With Business Use of Home
• IRC Section 274 — Disallowance of Certain Entertainment Expenses
• IRS Publication 587 — Business Use of Your Home
• IRS Publication 535 — Business Expenses
• IRS Publication 583 — Starting a Business and Keeping Records
• IRS Simplified Home Office Deduction
• IRS Standard Mileage Rates
• IRS One-Participant 401(k) Plans