1099 tax deductions: the write-offs self-employed people miss most
Every legitimate business expense you deduct lowers your taxable profit — and because the self-employed pay both income tax and self-employment tax on that profit, deductions do double duty. Missing them is one of the most expensive habits a freelancer can have. This guide walks through the deductions that matter most, how to claim each one safely, and the record-keeping that lets you claim with confidence.
The governing idea is simple. The IRS lets you deduct expenses that are "ordinary and necessary" for your business — ordinary meaning common in your line of work, necessary meaning helpful and appropriate. The IRS guidance on deducting business expenses is the primary reference; use this page to know what to look for.
The high-value deductions worth getting right
1. Home office
If you use part of your home regularly and exclusively for business, you can deduct a portion of your housing costs. There are two methods: the simplified method (a set rate per square foot of office space, up to a cap) and the actual-expense method (the business-use percentage of rent or mortgage interest, utilities, insurance, and repairs). "Exclusively" is the catch — a spare room used only as an office qualifies; the corner of a living room where the family also watches TV generally doesn't. See the IRS home office deduction rules, and estimate yours with our calculator.
2. Mileage and vehicle costs
Business driving is deductible two ways: the standard mileage rate (a per-mile amount the IRS updates annually) or actual expenses (the business-use share of gas, insurance, maintenance, and depreciation). Most people find the standard rate simpler. Note that ordinary commuting usually doesn't count, but trips to clients, job sites, the post office, and supply runs generally do. A contemporaneous mileage log — date, destination, purpose, miles — is essential. Gig drivers should see our gig worker taxes guide.
3. Self-employed health insurance
Without an employer plan, you may be able to deduct premiums for medical, dental, and qualifying long-term care coverage for yourself and your family — as an adjustment to income, not just an itemized deduction. Limits apply: you generally can't deduct more than your business profit, and you can't claim it for any month you were eligible for a spouse's or employer's subsidized plan. It's one of the most valuable deductions available to the self-employed. Our health insurance guide covers coverage and the deduction together.
4. Retirement contributions
Contributing to a SEP-IRA or Solo 401(k) can shelter a substantial share of your income from current tax while building your own retirement. The self-employed can often contribute far more than a standard IRA allows. This is a deduction and a savings plan at once — a rare win-win. Compare the options in our Solo 401(k) vs SEP-IRA guide.
5. Phone and internet
If you use your cell phone and home internet for business, deduct the business-use percentage — not the whole bill, unless a line is used exclusively for work. Estimate a reasonable percentage and be consistent. A dedicated business phone line is fully deductible.
6. Software, subscriptions, and tools
Accounting software, design and productivity apps, cloud storage, domain and hosting fees, professional subscriptions, and industry tools are all typically deductible. See our accounting software guide for tracking these automatically.
7. Business meals
Meals with a clear business purpose — a client lunch, a working meal while traveling — are generally deductible at a percentage set by current rules (often 50%). Note the purpose and who you were with. Entertainment expenses are generally not deductible, so keep meals and entertainment separate in your records.
8. Supplies, equipment, and other common costs
Beyond the headline items, don't overlook these everyday deductions:
- Supplies and materials used in your work
- Equipment — computers, cameras, tools (may be deducted in full the first year or depreciated)
- Professional services — bookkeeper, accountant, business attorney
- Business insurance and professional liability coverage
- Continuing education that maintains or improves skills for your current business
- Advertising and marketing — website, ads, business cards
- Bank and merchant fees on a business account or payment processor
- Half of your self-employment tax — an automatic adjustment on your return
Deduction cheat-sheet
| Deduction | Typical basis | Watch out for |
|---|---|---|
| Home office | Sq. ft. (simplified) or % of home (actual) | Must be regular and exclusive use |
| Mileage / vehicle | Standard rate per mile or actual costs | Commuting doesn't count; keep a log |
| Health insurance | Premiums, up to business profit | Not for months eligible for an employer plan |
| Retirement (SEP / Solo 401k) | Contributions within annual limits | Limits depend on income and plan type |
| Phone / internet | Business-use percentage | Deduct the business share, not the whole bill |
| Meals | Percentage of qualifying meals | Note purpose; entertainment excluded |
How to claim deductions safely
Deductions are legitimate and encouraged — the goal is simply to claim what's real and be able to show it. Three principles keep you on solid ground:
- Business purpose first. If you can explain in a sentence why an expense helps your business, it likely qualifies. If you can't, be cautious.
- Deduct the business share. For anything used partly for personal life — phone, internet, car, home — deduct only the business-use portion, and estimate it reasonably.
- Don't invent numbers. Round-number guesses without support are a red flag. Deduct actual amounts you can trace to a receipt or statement.
Record-keeping that makes tax time boring (in a good way)
Good records turn deductions from stressful to routine:
- Open a separate business bank account so business and personal spending never mix — see our banking guide.
- Keep digital copies of receipts and invoices; photograph paper receipts before they fade.
- Log mileage and home-office use as you go, not from memory in April.
- Use accounting software to categorize expenses automatically throughout the year.
- Keep records for several years in case you're ever asked to support a deduction.
Frequently asked questions
What can I write off as a 1099 contractor?
Generally, ordinary and necessary business expenses — costs common in your work and helpful to your business. Common examples: a home office, business mileage or vehicle costs, software and subscriptions, a share of phone and internet, supplies, professional services, and business meals. Health insurance and retirement contributions may also reduce taxable income.
Can I deduct my home office?
Yes, if you use part of your home regularly and exclusively for business. Use the simplified method (square footage) or the actual-expense method (percentage of the home). A dedicated space is generally required — a shared kitchen table usually doesn't qualify.
How does the mileage deduction work?
Deduct business driving via the standard mileage rate (a per-mile amount updated yearly) or actual vehicle expenses (business-use share of gas, insurance, repairs, depreciation). Commuting to a regular workplace generally doesn't count. Keep a log of dates, destinations, and purpose.
Can I deduct health insurance premiums?
Many self-employed people can deduct premiums for medical, dental, and qualifying long-term care coverage for their family as an adjustment to income, within limits — generally not more than business profit, and not for months you were eligible for an employer plan.
What records do I need?
Keep receipts, invoices, statements, and logs for mileage and home-office use. The expense should be ordinary and necessary, with a clear business purpose. A separate business account and good digital records make deductions easy to support.