What is
Schedule C?

Schedule C (officially "Profit or Loss from Business") is the IRS form you use to report income and expenses from a business you run as a sole proprietor or a single-member LLC that hasn't elected corporate tax treatment. It's attached to your Form 1040 every year you're self-employed.

Unlike a W-2 job, self-employment doesn't come with taxes withheld automatically. Schedule C is where you calculate your actual net profit — total business income minus deductible business expenses — and that number is what the IRS taxes, not your gross revenue.

If you freelance, drive for a rideshare app, sell products online, consult, or run any kind of one-person business, Schedule C is likely part of your tax return, even if you also have a regular job on the side.

You can file more than one Schedule C if you run multiple, distinct businesses — each one gets its own form, with its own income and expense totals. If your side work is more of a hobby without a real intent to turn a profit, different rules apply, and it's worth discussing that distinction with a tax professional before assuming Schedule C is the right form.

What goes on Schedule C

The form walks through your business activity in a few main sections. Getting each part right matters — it directly affects both your income tax and your self-employment tax. Most filers work through it once a year, but keeping running totals throughout the year makes the process much faster and far less prone to missed deductions.

• Gross income — total money your business brought in before any expenses.
• Cost of goods sold — if you sell physical products, this covers what it cost you to produce or acquire them.
• Business expenses — a long list of categories like advertising, supplies, insurance, vehicle use, and contract labor.
• Home office deduction — if you use part of your home regularly and exclusively for business.
• Net profit or loss — the bottom-line number, which flows to Schedule 1 and then your Form 1040.
• Depreciation — for larger business assets like equipment or vehicles, spread out over several years rather than deducted all at once.

This is the single most common point of confusion around Schedule C — and it makes sense, since the two forms are closely related but do very different jobs.

Getting a 1099-NEC doesn't automatically mean you file Schedule C — but if that income came from self-employment work, it almost always does. And the reverse matters too: you still owe tax on self-employment income even if a client never sent you a 1099-NEC at all, which is increasingly common now that the reporting threshold has risen from $600 to $2,000 for payments made in 2026.

Schedule C rarely stands alone. Depending on your business, several other forms typically come along with it.

• Schedule SE — calculates your self-employment tax based on your Schedule C net profit.
• Form 1040-ES — used to pay estimated quarterly taxes, since self-employment income has no withholding.
• Form 8829 — the detailed calculation form for the home office deduction, if you're claiming one.

A third common issue: mixing personal and business expenses in the same account. It makes Schedule C far harder to prepare accurately, and it's one of the first things that draws scrutiny if your return is ever reviewed. Separate accounts, even simple ones, save real time and reduce errors.

• 01Which of my business expenses actually qualify as deductions on Schedule C?
• 02Should I be paying quarterly estimated taxes based on my current profit?
• 03Do I qualify for the home office deduction, and is it worth claiming?
• 04Would an LLC or S-corp election change how I'm taxed on this income?
• 05Am I tracking mileage and depreciation correctly for business assets?