Every deduction you miss on Schedule C is money you overpay in taxes. A freelancer earning $80,000 who misses $15,000 in legitimate deductions pays an extra $5,490 in federal and self-employment taxes. Here is every category, with what qualifies and what doesn’t.
The Core Rule: Ordinary and Necessary
Every Schedule C deduction must meet the IRS standard: the expense must be ordinary (common and accepted in your industry) and necessary (helpful and appropriate for your business). Personal expenses are never deductible. Mixed-use items (like a phone or car used for both business and personal) are only deductible in proportion to business use.
Schedule C Deduction Categories: Complete Reference
Part II: Expenses (Lines 8–27a)
Line 8: Advertising
All expenses to market and promote your business:
- Website hosting, domain registration
- Social media advertising (Facebook, Instagram, Google Ads)
- Business cards, brochures, flyers
- Sponsorships with a business purpose
- Online directory listings
Does not include: Costs of your own time promoting your business (you can’t deduct your own labor)
Line 9: Car and Truck Expenses
Two methods — choose one per vehicle per year:
Standard Mileage Rate (2026): 70 cents per mile
| Business Miles | Deduction at 70¢ |
|---|---|
| 5,000 miles | $3,500 |
| 10,000 miles | $7,000 |
| 15,000 miles | $10,500 |
| 20,000 miles | $14,000 |
Actual Expense Method: Deduct the business-use % of:
- Gas and oil
- Car insurance
- Repairs and maintenance
- Registration and license fees
- Depreciation (or Section 179 in year one)
- Car loan interest (business-use % only)
If you use your car 60% for business, you deduct 60% of all actual costs.
Recordkeeping required: Date, destination, business purpose, and miles for every trip. A mileage app (MileIQ, Everlance) makes this easy.
Line 10: Commissions and Fees
Payments to non-employees for services:
- Sales commissions paid to independent contractors
- Referral fees
- Finder’s fees
If you pay a single person more than $600/year, you must issue a 1099-NEC.
Line 11: Contract Labor
Payments to freelancers and independent contractors you hire. Same as Line 10 in practice — the IRS separates them for reporting purposes. Both are fully deductible; both require 1099-NEC if over $600.
Line 13: Depreciation and Section 179
Capital assets with a useful life over 1 year must be depreciated — unless you elect immediate expensing:
| Method | 2026 Limit | How It Works |
|---|---|---|
| Section 179 | $1,160,000 | Deduct full cost of equipment in year one |
| Bonus Depreciation | 40% in 2026 | Deduct 40% of cost in year one for qualifying property |
| Regular MACRS Depreciation | No limit | Spread cost over 5, 7, or 15 years |
Most small business owners elect Section 179 for equipment, computers, software, and machinery to get the full deduction immediately.
Line 14: Employee Benefit Programs
Benefits you provide to employees (not yourself):
- Health insurance premiums for W-2 employees
- Group life insurance premiums
- Employee retirement plan contributions (401k match, SIMPLE IRA)
Your own health insurance as a self-employed person is deducted on Schedule 1, Line 17 — not Schedule C.
Line 15: Insurance
Business insurance premiums:
- General liability insurance
- Professional liability / E&O insurance
- Business property insurance
- Workers’ compensation insurance
- Cyber liability insurance
Does not include life insurance on yourself (not deductible) or health insurance for yourself (deducted elsewhere).
Line 16a & 16b: Interest
- Line 16a: Mortgage interest on business property
- Line 16b: Other business interest (business credit card interest, business loan interest)
Personal credit card interest used for business: deductible only if the card is used exclusively for business, or if you can document the business portion.
Line 17: Legal and Professional Services
- Attorney fees for business matters
- CPA or tax preparer fees for your business return
- Business consultant fees
- Bookkeeping fees
The cost of preparing your personal return is not deductible on Schedule C. Only fees directly related to the business.
Line 18: Office Expense
Small office supplies and consumables:
- Paper, pens, ink cartridges
- Postage and shipping
- Software subscriptions (if below Section 179 threshold)
- Desk accessories
Items over $2,500 typically should be capitalized (depreciated) unless using the de minimis safe harbor.
Line 19: Pension and Profit-Sharing Plans
Contributions to retirement plans you establish for yourself and employees:
- SEP-IRA: up to 25% of net self-employment income, max $70,000 (2026)
- Solo 401(k): up to $23,500 employee contribution + 25% employer contribution
- SIMPLE IRA: up to $16,500 employee + 3% match
These are among the most powerful deductions available — each dollar contributed reduces both income tax and, indirectly, future self-employment tax through reduced QBI.
Line 20a & 20b: Rent or Lease
- Line 20a: Rent on vehicles, machinery, and equipment
- Line 20b: Rent on business property (office, studio, workshop)
If you rent a desk at a co-working space, that’s fully deductible here. Month-to-month software subscriptions often go on Line 18 or 26 instead.
Line 21: Repairs and Maintenance
Costs to maintain business property in working condition:
- Fixing business equipment
- Painting a business office
- Routine maintenance on business vehicles (oil changes, tires)
Capital improvements (adding value or extending useful life) must be depreciated — not expensed on Line 21.
Line 22: Supplies
Items specific to your trade or business that are used up during the year. Different from general office supplies (Line 18):
- A plumber’s pipe fittings and solder
- A photographer’s SD cards and batteries
- A baker’s ingredients (if business-related)
- Specialized tools under $2,500
Line 23: Taxes and Licenses
- Business licenses and permits
- State and local business taxes
- Payroll taxes on employee wages (employer portion)
- Self-employment tax deduction: the deductible half of SE tax is taken on Schedule 1, not Schedule C, but effectively reduces the same taxable income
Cannot include: Federal income tax, federal SE tax (it’s not a business expense — it’s a personal obligation)
Line 24: Travel and Meals
Travel (Line 24a) — 100% deductible:
- Airfare, train, bus for business travel
- Hotel while traveling overnight for business
- Rental car during business trip
- 50% of meals while traveling overnight
Requirements: Must be away from your “tax home” (your regular place of business) overnight.
Meals (Line 24b) — 50% deductible:
- Business meals with clients, prospects, or business partners
- Must document: date, place, amount, business purpose, relationship of attendees
- Your lunch eaten alone while working is NOT deductible
Line 25: Utilities
If you have a dedicated business space (office, studio, workshop):
- Electricity, gas, water
- Internet for the business
- Phone (business-use portion)
For a home office, utilities are claimed as part of the home office deduction (Line 30), not here.
Line 26: Wages
Wages paid to employees (W-2 employees only). Does not include payments to independent contractors (those go on Lines 10–11) or your own compensation (sole proprietors cannot pay themselves wages).
Line 30: Home Office Deduction
Simplified method: $5/sq ft × business sq ft (max 300 sq ft = $1,500)
Regular method: Actual home expenses × (business sq ft ÷ total home sq ft)
| Home Expense | Annual Cost | 15% Business Use | Deduction |
|---|---|---|---|
| Mortgage interest / rent | $18,000 | × 15% | $2,700 |
| Homeowner’s insurance | $1,400 | × 15% | $210 |
| Utilities | $3,600 | × 15% | $540 |
| Repairs | $800 | × 15% | $120 |
| Total | $23,800 | $3,570 |
Rules: The space must be used exclusively and regularly for business. A guest bedroom that occasionally doubles as an office does not qualify.
Above-the-Line Deductions That Don’t Appear on Schedule C
These reduce income tax further — claim on Schedule 1:
| Deduction | Where | 2026 Limit |
|---|---|---|
| Deductible half of SE tax | Schedule 1, Line 15 | ~7.65% of net SE income |
| Self-employed health insurance | Schedule 1, Line 17 | Actual premium paid |
| SEP-IRA / Solo 401k contributions | Schedule 1, Line 16 | SEP: $70,000; Solo 401k: $70,000 |
These are claimed after Schedule C but reduce your adjusted gross income — making them especially powerful.
Quick-Reference Deduction Table
| Category | Schedule C Line | Limit / Rule |
|---|---|---|
| Advertising | 8 | Fully deductible |
| Car (standard mileage) | 9 | 70¢/mile (2026) |
| Car (actual expenses) | 9 | Business-use % |
| Commissions/contract labor | 10–11 | Fully deductible; 1099-NEC if >$600 |
| Equipment (Section 179) | 13 | Up to $1,160,000 in 2026 |
| Business insurance | 15 | Fully deductible |
| Business loan interest | 16b | Fully deductible |
| Legal/accounting fees | 17 | Fully deductible (business portion) |
| Office supplies | 18 | Fully deductible |
| Retirement contributions | 19 | Up to $70,000 (SEP/Solo 401k) |
| Business rent | 20b | Fully deductible |
| Meals with clients | 24b | 50% deductible |
| Business travel | 24a | 100% deductible |
| Home office (simplified) | 30 | $5/sq ft, max $1,500 |
| Home office (regular) | 30 | Actual expenses × business % |
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