The U.S. Treasury and IRS issue the form, and the IRS counted 30,980,966 nonfarm sole-proprietorship returns for tax year 2022. For Australian readers there is an extra layer: Schedule C is not an Australian tax form. This guide covers who files it, how the calculation works, which expenses and records matter, and how losses are handled.
Key Takeaways
- Schedule C generally covers sole proprietors and single-member LLCs taxed as disregarded entities.
- Net profit equals income, less returns, cost of goods sold, and allowable expenses.
- Deductions need a business connection and records, not just a business bank account.
- A loss on line 31 may not be fully deductible this year.
What Is Schedule C and Who Uses It?
Schedule C, "Profit or Loss From Business (Sole Proprietorship)," reports income and expenses from an unincorporated business and produces a net profit or loss for Form 1040.
Who files it
- Sole proprietors, freelancers, and independent contractors
- Gig workers and side-business owners
- Single-member LLCs taxed as disregarded entities (no corporate election on Form 8832)
The activity must be run mainly for income or profit, with continuity and regularity. Hobbies don't qualify, and a not-for-profit activity's loss cannot offset other income.
Who doesn't file it
Other structures use different returns. Form 1065 is the partnership form, and Form 1120 is the C-corporation form. Domestic multi-member LLCs default to partnership status, while an LLC can elect corporate treatment using Form 8832.
LLC classification and the Australian context
An LLC's legal structure and its federal tax classification are separate questions. Defaults follow the member count above, and either type can elect corporate treatment. No single classification fits every situation; ownership, liability goals, income, and payroll all matter.
If you are in Australia, confirm any U.S. filing obligation before you rely on these rules. U.S. citizens and resident aliens living abroad generally owe tax on worldwide income, so an Australian address alone does not settle your U.S. status. Australian reporting, such as GST and BAS, is a separate system.
How Schedule C Calculates Business Profit or Loss
The core formula:
Gross receipts and other income − returns and allowances − cost of goods sold − allowable expenses = net profit or loss
On the 2026 form, the lines run like this:
| Step | Lines |
|---|---|
| Gross receipts less returns and allowances | 1 − 2 = 3 |
| Subtract cost of goods sold (from line 42) | 3 − 4 = 5 |
| Add other income | 5 + 6 = 7 |
| Subtract total expenses | 7 − 28 = 29 |
| Subtract home-office expenses | 29 − 30 = 31 |
Line numbers change between years, so check the current form.
Compiling gross receipts
Include every channel: cash, direct payments, card processors, online platforms, and amounts on Forms 1099-NEC or 1099-K. A 1099 is not your complete income record. Business income is reportable whether or not you receive a Form 1099-K.
The third-party network threshold is now payments over $20,000 and more than 200 transactions. That governs who gets a form, not what is taxable.
Cost of goods sold
Product businesses calculate COGS as beginning inventory, plus purchases and direct labour or materials, minus ending inventory. Lines 35 to 42 hold the calculation, and line 42 feeds line 4. Keep inventory and direct costs separate from ordinary overhead.
Small businesses with average gross receipts of $31 million or less may qualify for simplified inventory treatment. Check Publication 334.
Where the result goes
Line 31 flows to Schedule 1 and Schedule SE. For tax year 2025, Schedule 1 carries it to Form 1040, line 8. It affects both income tax and self-employment tax.
How to Complete Schedule C Using Your Business Records
Gather these records before you begin:
- The current-year Schedule C and instructions
- Bookkeeping reports, bank and card statements
- Invoices, receipts, and payment-platform records
- Forms 1099, inventory counts, and asset records
- Mileage logs and your EIN
Your accounting method must match how you actually record income:
- Cash: income received and expenses paid
- Accrual: income earned and expenses incurred
Changing methods generally requires Form 3115.
Business details and income
The top of Schedule C identifies the business:
- Business code: the six-digit code for your principal source of receipts.
- EIN: your employer identification number, not your SSN. Leave blank if you have none.
- Material participation: a business without it is generally passive, and Form 8582 may limit losses.
Then walk through gross receipts, returns and allowances, and other income. Reconcile each figure to your books and investigate any mismatch with a 1099.
Expenses, COGS, and vehicles
Not every business completes every part. The form covers operating expenses, COGS, vehicle information, depreciation, home office, and other expenses.
- Form 4562 for depreciation on property placed in service in 2025, listed property, section 179, or new amortization
- Form 8829 for actual home-office expenses; the simplified method uses $5 per square foot, up to 300 square feet
Reconcile before filing
Compare your finished return with the year-end profit-and-loss report, ledger, bank activity, platform statements, inventory records, and information returns. Materially different businesses need separate Schedule C forms. When activities, owners, or methods get complicated, get professional guidance.
Which Business Expenses and Records Matter Most?
What qualifies
Expenses must be ordinary and necessary. Per IRS Publication 583, ordinary means common and accepted in your trade. Necessary means helpful and appropriate, not indispensable.
Typical categories include advertising, software, professional fees, contract labour, insurance, rent, utilities, repairs, and business travel. Meals are generally 50% deductible.
Mixed-use costs
Vehicles, home offices, phones, and internet need a defensible business-versus-personal split.
- Vehicle: the 2026 rate is 72.5 cents per business mile. Log dates, destinations, purpose, and business and total miles.
- Home office: the area must be used exclusively and regularly for business.
- Phones and internet: keep a supportable business-versus-personal percentage
Example: a flower-delivery van drove 20,000 miles, 16,000 for deliveries. At 80% business use, 80% of operating costs were deductible.
Recordkeeping habits
- Keep business and personal transactions separate
- Use consistent categories and reconcile monthly
- Retain invoices, receipts, contracts, and mileage logs
- Note unusual transactions at the time
Your year-end report should trace to source documents, not memory. Retention is generally three years, extending to six if you omit income exceeding 25% of reported gross income.
Common errors
- Omitted cash or platform income
- Counting Form 1099 amounts twice
- Personal costs treated as business costs
- COGS mixed into operating expenses
- Unsupported vehicle or home-office claims
- Expenses recorded in the wrong business
Rates, limits, and line numbers change. Verify against current IRS sources.
After Schedule C: Losses, Related Forms, and Next Steps
Understanding a loss
When expenses exceed income, you have a net loss, but line 31 need not equal what you can deduct now. Limits apply in order:
- At-risk rules (Form 6198)
- Passive-activity rules (Form 8582)
- Excess business loss (Form 461), with 2026 thresholds of $256,000 single or $512,000 joint
Disallowed excess business loss becomes an NOL carryover (Form 172). Profit-motive rules apply too. Never manufacture a loss with unsupported expenses.
Related forms and obligations
- Schedule SE: required at $400 or more of net self-employment earnings
- SE tax rate: 15.3% (12.4% Social Security plus 2.9% Medicare) on 92.35% of net profit
- Form 1040-ES: generally needed if you expect to owe $1,000 or more in tax.
- Safe harbor: use 110% of prior-year tax if 2025 AGI exceeded $150,000.
- Forms 4562 and 8829: only if your facts require them.
Final checklist
- Confirm your taxpayer and business classification
- Reconcile all income
- Review COGS and expenses
- Attach required supporting forms
- Retain documentation
- Review federal, state, and cross-border obligations
VJM Global supports Australian businesses and owners with U.S. reporting obligations through bookkeeping, accounting, and U.S. tax-compliance work, helping organise records and improve accuracy. This doesn't replace individualised tax advice.
Frequently Asked Questions
What qualifies as a business expense on Schedule C?
It must be ordinary and necessary, with a clear business purpose. Mixed-use costs need a documented allocation, and you need records to support each claim.
Can I write off my business losses on my taxes?
A genuine loss may flow to your return. Profit-motive, at-risk, passive, and excess-loss rules determine how much you can use this year.
Which tax classification is best for an LLC?
None is best for everyone. Weigh ownership, liability goals, income, payroll, elections, and compliance costs.
Where do I find net income on Schedule C?
Net profit or loss is the result after income, COGS, and allowable expenses. It is line 31 on the 2026 form.
Who needs to file a Schedule C with Form 1040?
Sole proprietors, freelancers, independent contractors, and qualifying single-member LLCs. Partnerships and corporations file different returns.
How does Schedule C profit affect self-employment tax?
Net business earnings feed Schedule SE, which calculates the tax. The final amount depends on current rules and your full situation.
