What Schedule C does

Schedule C reports the profit or loss from your sole proprietorship or single-member LLC. The bottom-line number (Line 31) flows to:

Part I — Income

Line 1: Gross receipts or sales

Everything you got paid, before any deductions. Cash, check, ACH, 1099 income, non-1099 income. Every dollar. If you got paid in crypto, convert to USD at the time of receipt.

Line 2: Returns and allowances

Refunds you gave to customers. Most service businesses have $0 here.

Line 4: Cost of goods sold (from Part III)

Only for businesses that sell physical products. Part III does the calculation.

Line 6: Other income

Unusual stuff — interest from business accounts, insurance refunds, fuel credits. Mostly blank for service businesses.

Part II — Expenses

Line 8: Advertising

Ads you ran: Google, Meta, LinkedIn, Twitter, sponsored newsletters, billboards, business cards, website hosting if you use it for marketing. Domain registration. A reasonable line item.

Line 9: Car and truck expenses

Either standard mileage (business miles × $0.70) or actual costs × business-use percentage. Method choice matters.

Line 10: Commissions and fees

Sales commissions to non-employees, broker fees. Most solo businesses leave this blank.

Line 11: Contract labor

Payments to independent contractors (1099 recipients). Every person you paid $600+ goes here in aggregate.

Common error

Don't put employee wages on Line 11. Employees go on Line 26. Contractors go on Line 11. Misclassifying is an audit flag.

Line 12: Depletion

Natural resources (mining, timber). Almost nobody.

Line 13: Depreciation and Section 179

The wear-and-tear on your business assets. Computers, furniture, equipment, vehicles (actual method). How 179 vs bonus compares. Backed by Form 4562.

Line 14: Employee benefit programs

If you have employees, their health insurance and other benefits. Not your own self-employed health insurance — that goes on Schedule 1, not here.

Line 15: Insurance (other than health)

Business liability, E&O, cyber insurance, business property insurance. Not health insurance. Not car insurance (that's in Line 9).

Line 16: Interest

Business loan interest, credit card interest on business cards.

Line 17: Legal and professional services

Attorneys, accountants, bookkeepers, CPAs, business consultants. The fee you paid to have your taxes done.

Line 18: Office expense

Pens, paper, printer ink, small office supplies. Think "things under $50." Equipment over $200 usually gets depreciated instead.

Line 19: Pension and profit-sharing plans

Contributions you made for your employees, if any. Your own SEP-IRA / Solo 401k contribution goes on Schedule 1, not here.

Line 20a: Rent or lease — vehicles, machinery, equipment

Leased equipment. Leased vehicles (if using actual method).

Line 20b: Rent or lease — other business property

Office rent. Co-working memberships. Storage units. Not your home office rent — that's Form 8829.

Line 21: Repairs and maintenance

Fixing things, not improving them. Replacing a broken component on equipment (repair) vs upgrading to a better system (improvement). Improvements get depreciated.

Line 22: Supplies

Consumable materials used in your business. Different from office supplies (Line 18). A hair stylist's shampoo goes here. A consultant's printer paper goes on Line 18.

Line 23: Taxes and licenses

State business license, professional license fees, local business tax, sales tax you paid on business purchases (and didn't already include in the cost).

Line 24a: Travel

Airfare, hotels, rental cars, ride-shares during business trips. Not commute. Not meals (that's 24b).

Line 24b: Deductible meals

Enter the full amount — the 50% limit is applied by the form. The meal rules.

Line 25: Utilities

Office utilities if you rent an office. Business phone if dedicated. Internet (business %). Not home utilities — those go through Form 8829.

Line 26: Wages

W-2 wages to employees. Not your own draws. Not contractor payments.

Line 27a: Other expenses (from Part V)

Everything that doesn't fit elsewhere. Bank fees. Subscriptions. Education. Startup costs amortization. Part V lets you itemize these.

Line 28: Total expenses

Sum of lines 8 through 27a.

Line 29: Tentative profit or loss

Line 7 minus Line 28.

Line 30: Expenses for business use of your home

Either the simplified method (up to $1,500) or the actual method from Form 8829. Which method to pick.

Line 31: Net profit or loss

Line 29 minus Line 30. This is your bottom line. Flows to Schedule 1 Line 3 (then 1040) and Schedule SE.

Part III — Cost of Goods Sold

Only for product businesses. Beginning inventory + purchases − ending inventory = COGS.

Part IV — Information on Your Vehicle

Business miles, commuting miles, other miles. Required if claiming vehicle expenses and not depreciating the vehicle separately on Form 4562.

Part V — Other Expenses

Itemize everything that went on Line 27a. List them one per line with descriptions. Examples:

The most common Schedule C errors

Top mistakes we see
  1. Missing Schedule 1 Line 15 (employer-half SE tax deduction)
  2. Missing Schedule 1 Line 16 (self-employed retirement contributions)
  3. Missing Schedule 1 Line 17 (self-employed health insurance)
  4. Home office rent entered as monthly not annual
  5. Mileage claimed without a log
  6. Contract labor on Line 11 without 1099s filed (IRS cross-check trigger)
  7. Home office deduction claimed without exclusive-use qualifying

We check every Schedule C line against the common mistakes.

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