Key takeaways
- A 1099 write-off is any ordinary and necessary business expense, reported on Schedule C.
- Deductions cut both income tax and the 15.3% self-employment tax, saving roughly 25 to 40 cents per dollar.
- The largest write-offs are usually home office, mileage, retirement contributions, health insurance, and the 20% QBI deduction.
- You need receipts and a mileage log to claim them, kept for at least three years.
How 1099 write-offs work
As a contractor, your tax is based on net profit, which is your income minus your deductible business expenses. Because both self-employment tax and income tax are calculated on that profit, every dollar you deduct is taxed at neither rate. A W-2 employee generally cannot deduct job expenses at all, so this is one of the real advantages of being self-employed. The IRS standard is simple: an expense is deductible if it is ordinary (common in your line of work) and necessary (helpful and appropriate for the business). It does not have to be indispensable.
The complete list of 1099 tax deductions
Here are the deductions most contractors can claim, with the Schedule C line (or other form) where each one goes:
| Deduction | Where it goes | What it covers |
|---|---|---|
| Home office | Form 8829 / Line 30 | A dedicated workspace, by actual square footage or the simplified $5 per square foot (up to 300 sq ft). |
| Car and mileage | Line 9 | 70 cents per business mile for 2025, or actual vehicle costs. Tolls and parking are separate. |
| Phone and internet | Line 25 / 27a | The business-use percentage of your cell phone and home internet. |
| Software and subscriptions | Line 27a | Design tools, accounting apps, hosting, domains, stock libraries, AI tools. |
| Supplies | Line 22 | Consumables you use up in the work, from printer ink to materials. |
| Equipment and tools | Line 13 / Line 22 | Laptops, cameras, and gear. Larger items are depreciated or expensed under Section 179. |
| Business meals | Line 24b | Generally 50% deductible when there is a business purpose. Keep the who and why. |
| Travel | Line 24a | Flights, hotels, and transportation for business trips away from your tax home. |
| Advertising and marketing | Line 8 | Ads, your website, business cards, email tools, and promotional costs. |
| Professional services | Line 17 | Legal, accounting, bookkeeping, and tax-prep fees for your business. |
| Education and training | Line 27a | Courses, books, and certifications that maintain or improve your current work. |
| Self-employed health insurance | Schedule 1 | Premiums for you and your family, deductible from income (not on Schedule C itself). |
| Retirement contributions | Schedule 1 | SEP-IRA or Solo 401(k) contributions reduce taxable income, often by a lot. |
| Business insurance | Line 15 | Liability, professional indemnity, and other business policies. |
| Rent and coworking | Line 20b | Office or coworking space rent if you do not claim a home office. |
| Bank and merchant fees | Line 27a | Business account fees, Stripe and PayPal fees, and interest on business loans. |
| Contract labor | Line 11 | Subcontractors and freelancers you pay (issue them a 1099-NEC over $600). |
| Startup costs | Line 27a | Up to $5,000 of costs to launch the business in your first year. |
Two more deductions are taken on your Form 1040 rather than Schedule C: the deductible half of your self-employment tax, and the 20% Qualified Business Income (QBI) deduction on your net profit. Both are automatic in good tax software but easy to forget when filing by hand.
The deductions worth the most
Not all write-offs are equal. These four tend to move the needle most for contractors:
- Retirement contributions. A SEP-IRA or Solo 401(k) can shelter a large share of net profit, often $10,000 or more, from income tax.
- Home office. A dedicated workspace unlocks a percentage of your rent or mortgage, utilities, and insurance.
- Mileage. At 70 cents per mile, business driving quietly becomes one of the biggest deductions, and the one most often under-tracked.
- Self-employed health insurance and QBI. Premiums plus the 20% QBI deduction can each remove thousands from taxable income.
What is NOT deductible
Claiming the wrong thing is what draws IRS attention, so know the limits:
- Your commute to a regular place of work (business driving between jobs is fine).
- Everyday clothing, even if you only wear it for work. Only genuine uniforms or protective gear count.
- Personal expenses, and the personal share of mixed-use items like your phone.
- The full cost of meals with no business purpose, or any meal that is lavish.
- Fines and penalties, such as traffic or parking tickets.
- Personal life insurance and most political or lobbying costs.
When an expense is part business and part personal, deduct only the business percentage and keep a note of how you calculated it.
How to track your deductions
A deduction you cannot prove is a deduction you will lose in an audit, and one you forget is money left on the table. The fix is to capture expenses as they happen rather than reconstructing them in April. Snap a photo of every receipt, log business miles the day you drive, and tag each cost to its Schedule C category. That is exactly what NeoReceipt automates: it reads each receipt, assigns the right category, tracks your mileage at the IRS rate, and gives you a clean, export-ready total at tax time.
Estimate the tax these deductions save you with our free calculators, then let NeoReceipt make sure you capture every one.