1040 Schedule C: How the IRS works for your small business

• Schedule C is the mandatory IRS form for reporting your sole proprietorship’s annual business income and expenses to calculate your net profit or loss.
• Who needs it: Sole proprietors, freelancers, and gig workers use Schedule C to report business profit or loss.
• What it covers: The form calculates taxable income by subtracting valid business expenses from your gross revenue.
• Key deductions: You can lower your tax bill by claiming expenses like home office costs, vehicle mileage, and advertising.
• Form fill-out simplified: Using pdfFiller allows you to easily access and complete Schedule C online without needing to print it out.

What is a Schedule C on a 1040 form?

The IRS Schedule C “Profit or Loss From Business (Sole Proprietorship)” is an additional form attached to your main Form 1040 tax return. If you’re self-employed, this form shows the government whether your business made a profit or a loss for the year. The IRS considers an activity a business if you engage in it regularly with the primary goal of earning an income or profit.

On Schedule C, you’ll list your total business income and expenses. The final number shows your net profit or loss, which you’ll then report on your personal Form 1040. A profit is taxable, while a loss may lower your overall taxable income.

Who must file Schedule C?

The IRS requires you to file a Schedule C if you operate a business or practice a profession as a sole proprietor, meaning you are an individual who owns an unincorporated business.

Types of self-employed businesses:

• Freelancers: Writers, designers, and developers who take on contract work.
• Gig workers: Drivers for rideshare apps, food delivery couriers, or task-based workers.
• Independent contractors: Construction workers, consultants, or anyone who receives a 1099-NEC form instead of a W-2.
• Side hustlers: If you sell handmade crafts online or bake cakes on weekends for profit, you are technically running a small business.

Even if you have a full-time job and run a business on the side, you must report that side income using this form.

What’s new for the 2025 Schedule C form?

Here are the practical 2025 items most small businesses will notice when completing Form 1040 Schedule C:

• Vehicle deductions: The standard mileage rate is 70¢/mile for 2025. You can still choose actual expenses if they’re higher and you have records.
• Self-employment tax cap: The Social Security wage base is $176,100 for 2025, which affects how much of your net self-employment income is subject to the 12.4% Social Security portion of SE tax (Medicare is uncapped).

How do I fill out a Schedule C tax form?

Schedule C for small businesses consists of five distinct parts, plus an information block at the top.

Information block
Enter your name, Social Security number, Employer Identification Number, your principal business code (a six-digit number identifying your industry), business address, and indicate your accounting method (cash, accrual, or other).

Part I: Income
Here, you report income – all the money that came in:

• Gross receipts or sales (the total revenue from your business)
• Returns and allowances (money you refunded to customers.
• Cost of goods sold (If you sell physical products, subtract the production costs here, as calculated in Part III).

Part II: Expenses
This section is crucial for reducing your tax liability. List costs like advertising, legal fees, rent, utilities, pension plans, etc. Generally, any “ordinary and necessary” business expense belongs here.

Easily complete your 1040 Schedule C online using pdfFiller editor.

Part III: Cost of goods sold
If your business holds inventory, use this section to list your beginning inventory, purchases, and ending inventory. Service-based businesses can generally skip this part.

Part IV: Information on your vehicle
If you claim car or truck expenses, the IRS requires details. You must report when you place the vehicle in service and the total miles driven for both business and personal use.

Part V: Other expenses
If you have business expenses that don’t fit the categories in Part II (like professional memberships or software subscriptions), you list them here.

Completing the reports on your Cost of Goods Sold, Vehicle information, and other expenses on the Schedule C using the pdfFiller online editor.

With pdfFiller, you can easily complete your Schedule C form online, save your progress, and return later if you need to find a receipt. Keep a clean, professional copy in your account for your records. You can download or print the form, or request that your Form 1040 and required schedules be sent via USPS to the appropriate IRS department—all without leaving the editor.

For a visual guide, watch our video walkthrough on completing Form 1040 Schedule C with pdfFiller.

What are the record-keeping requirements for Schedule C?

You must back up your Schedule C business income and deductions with accurate records:

• Gross receipts (bank statements, cash register tapes, invoice copies, and 1099 forms you received)
• Expense proofs (receipts, bills, mileage logs, canceled checks, and digital statements)
• Assets (records of machinery, furniture, or real estate used for business, including purchase dates and prices).

Keep supporting records for your personal tax return until the period of limitations expires, which depends on your filings or claims. The IRS provides guidelines on how long to retain business records.

What common business deductions can I claim?

For an expense to be deductible on the IRS Schedule C, it must be both ordinary (common and accepted in your trade or business) and necessary (helpful and appropriate for your business).

• Home office (if exclusive and regular use; often computed on Form 8829 where required)
• Vehicle expenses (70¢/mile for 2025 or actual costs; keep a contemporaneous log).
• Supplies and small equipment (like paper, pens, or cleaning supplies)
• Advertising and marketing
• Insurance (business liability, professional)
• Professional fees (legal and professional services like accounting)
• Travel, meals (50% limits), and local transportation—see Publication 463 for more details.

Is there a Schedule C-EZ option?

In the past, the IRS offered a simplified version of the form called Schedule C-EZ. It was intended for businesses with very simple finances and expenses under $5,000.

Update: The IRS has discontinued Schedule C-EZ. Starting with the 2019 tax year, all sole proprietors must use the standard Schedule C.

How do annual vs. quarterly filing options work?

Your Schedule C is filed annually with your Form 1040, usually by April 15th. However, the taxes you owe on that business income might be due earlier.

The US has a “pay-as-you-go” tax system, so you’re expected to pay taxes on income as you earn it. Since you don’t have an employer to withhold taxes from your paychecks, you may need to make estimated tax payments each quarter (in April, June, September, and January).

Use Form 1040-ES to calculate and pay quarterly taxes. When filing your annual Schedule C, you’ll determine your total tax liability. If your quarterly payments were sufficient, you’re all set. If not, you may owe a balance and a penalty.

How is net profit or loss calculated?

Calculating your final number is the main goal of the 1040 Schedule C.

Here is the basic formula:
Gross Income – Total Expenses = Net Profit (or Loss)

1. Sum up income: Add all sales and receipts in Part I.
2. Sum up expenses: Add all deductible costs in Part II.
3. Subtract: Take your Income and subtract your Expenses.

If the number is positive, you have a Net Profit. This amount is entered on your Form 1040 (as income) and on Schedule SE (to calculate self-employment tax).

If the number is negative, you have a Net Loss. This can offset other income, like W-2 wages, which may lower your overall tax bill. Be aware that claiming frequent losses can attract IRS attention, so always keep accurate records.

Final thoughts

Schedule C tax form is the backbone of U.S. tax reporting for small, non-corporate businesses. With clear records and the right tools, you can capture every legitimate deduction, compute an accurate net profit, and integrate seamlessly with your Form 1040 and Schedule SE. Open Form 1040 and Schedule C templates in pdfFiller to easily fill out and organize, and securely store your records—so tax season doesn’t slow your business down.

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Glossary

• Sole proprietor: A business owner not registered as a corporation or LLC, where the owner and business are legally the same for tax purposes.
• Gross receipts: The total amount of money a business receives from all sources during its annual accounting period, before subtracting any costs or expenses.
• Deductible expense: A business cost that the IRS allows you to subtract from your gross income, which lowers the amount of profit you have to pay taxes on.
• Cost of Goods Sold (COGS): The direct costs attributable to the production of the goods sold in a company, including the cost of materials and direct labor.