Schedule C: Profit or Loss From Business
Every dollar you subtract here saves income tax AND self-employment tax.
Educational content only — not tax advice. Schedule C rules are complex and situation-specific. Work with a qualified tax professional when filing.
Why This Matters
Schedule C is where the self-employed business owner reports all business income and deducts all legitimate expenses — arriving at net profit that flows into two tax calculations simultaneously:
- Income tax (added to other income on Form 1040)
- Self-employment tax (calculated on Schedule SE using Schedule C net profit)
At a 22% income tax rate plus ~14.1% effective SE tax rate, a documented $1,000 deduction saves approximately $361 in total federal taxes.
What Is Schedule C?
SCHEDULE C OVERVIEW
Part I: Income — Gross receipts − returns − COGS = Gross profit
Part II: Expenses (25 labeled categories)
Part III: Cost of Goods Sold (inventory businesses)
Part IV: Vehicle information (if vehicle deduction claimed)
Part V: Other expenses
BOTTOM LINE: Gross income − Total expenses = NET PROFIT → Schedule 1 + Schedule SE
Filed by sole proprietors, single-member LLCs, independent contractors, and self-employed professionals. One Schedule C per business.
Mini Schedule C Builder
Gross receipts − expenses → net profit → SE tax estimate. Adjust values to model your business.
Part II — Expenses
Gross Profit
$157,800
Total Expenses
$178,250
Net Profit (Line 31)
$-20,450
Est. SE Tax
$0
Ded. half: $0
Net profit flows to Schedule SE: $0 × 0.9235 × 15.3% = $0 SE tax
Part I: Reporting Business Income
ABC COFFEE SHOP — INCOME
Cash and card sales: $185,000
Catering revenue: $24,000
Cold brew online sales: $18,000
Gift card redemptions: $3,200
Gross receipts: $232,000
Returns and allowances: − $2,000
COGS: − $72,200
Gross profit: $157,800
Line 1 includes ALL revenue — cash, card, Venmo, PayPal, third-party delivery. IRS matches 1099-K forms to Schedule C line 1.
Part II: Key Expense Categories
Line 8: Advertising
Social media ads, signage, website, marketing photography — ABC: $8,400/year
Line 9: Car & Truck
Standard mileage: $0.70/mile (2025) or actual expense method. ABC: 8,500 mi × $0.70 = $5,950
Line 10: Commissions
Payment processor fees (Stripe, Square ~2.9%), delivery platform commissions — ABC: $4,300
Line 11: Contract Labor
Independent contractors (NOT employees). Issue 1099-NEC for $600+ — ABC: $6,200
Line 13: Depreciation
Equipment, furniture, vehicles via Form 4562 — Section 179, bonus, or MACRS
Line 15: Insurance
General liability, property, workers' comp, business vehicle — ABC: $5,800
Line 17: Legal & Professional
CPA, attorney, bookkeeper — ABC: $9,600
Line 26: Wages
Employee wages/salaries — does NOT include owner's draw
Line 30: Home Office
Regular and exclusive business use required — see below
The Home Office Deduction
Method 1: Simplified
$5/sq ft, max 300 sq ft = $1,500 max
180 sq ft × $5 = $900
Method 2: Regular (Actual)
Business % = office sq ft ÷ total home sq ft
200/2,000 = 10% × $30,000 = $3,000
Depreciation Strategies
| Strategy | 2025 | Key Feature |
|---|---|---|
| Section 179 | $1,250,000 limit | Cannot create a loss |
| Bonus Depreciation | 100% permanent (OBBBA) | Can create a loss; automatic |
| MACRS | 5–39 year recovery | Spread over useful life |
ABC buys $18,000 espresso machine: Section 179 deducts full $18,000 in year placed in service. Tax savings at ~36.1% combined rate: $6,498.
Cost of Goods Sold (Part III)
Beginning inventory: $4,200
+ Purchases: $74,000
+ Materials: $3,800
− Ending inventory: − $9,800
COGS: $72,200
ABC Coffee Shop: Complete Schedule C
SCHEDULE C — ABC COFFEE SHOP (2025)
INCOME
Gross receipts: $232,000
Returns: − $2,000
COGS: − $72,200
Gross profit: $157,800
EXPENSES
Advertising: − $8,400
Car (8,500 mi × $0.70): − $5,950
Commissions/fees: − $4,300
Contract labor: − $6,200
Depreciation (S179 espresso): − $18,000
Insurance: − $6,600
Interest: − $2,400
Legal/professional: − $9,600
Office expense: − $1,800
Rent: − $36,000
Repairs/maintenance: − $4,100
Supplies: − $8,600
Taxes/licenses: − $2,900
Utilities: − $7,200
Wages: − $52,000
Home office (regular method): − $3,000
Other: − $1,200
Total expenses: − $178,250
NET PROFIT: −$20,450 (paper loss from Section 179 timing)
The $18,000 Section 179 deduction created the paper loss. Without it (5-yr MACRS ~$3,600): net profit ≈ −$6,050. This depreciation timing decision is made annually with your CPA.
Record-Keeping Requirements
- All expenses: amount, date, business purpose, vendor
- Meals: receipt + business purpose + attendees + topic
- Vehicle: mileage log with date, destination, purpose, miles
- Home office: floor plan + square footage + utility bills
- Equipment: invoice + date placed in service + business use %
- Retain records 7 years; dedicated business checking account recommended
Common Mistakes
Mistake 1: Mixing personal and business expenses
Without allocation, personal costs are not deductible and create audit risk.
Mistake 2: No mileage log for standard mileage
IRS requires contemporaneous records — apps like MileIQ help.
Mistake 3: Deducting owner's draw as wages
Owner profits are not wages; only employee compensation goes on Line 26.
Mistake 4: Ignoring business-use percentage
Section 179 and vehicle deductions apply only to the business portion.
Key Takeaway
Schedule C calculates net self-employment profit — and every dollar deducted reduces both income tax and SE tax. Major categories include vehicle ($0.70/mile in 2025), home office, equipment (Section 179 at $1.25M limit or 100% bonus depreciation), wages, rent, supplies, and insurance. Net profit flows to Schedule SE — making it the most powerful tax-reduction lever available to a self-employed owner.
Test Your Understanding
Question 1: ABC owner drove 6,000 business miles in 2025 (standard mileage method). Deduction?
Question 2: ABC buys a $25,000 delivery van, 80% business use, elects Section 179. Maximum deduction?
Ready to Practice?
Build a Schedule C, categorize expenses, and see how net profit drives SE tax in the Practice Lab.
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