Schedule C, formally titled Profit or Loss From Business, is the federal tax form sole proprietors and single-member LLCs use to report what their business earned and spent during the year. The form walks through your gross income, subtracts allowable expenses, and produces a single net profit or net loss figure that flows into the rest of your Form 1040. If your net self-employment earnings reach $400 in a tax year, you owe self-employment tax and generally have to file this form with your return.1Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) Getting the number right matters because it drives both your income tax and your self-employment tax.
Who Files Schedule C
Three groups use Schedule C. The largest is sole proprietors: freelancers, independent contractors, and gig workers who receive 1099-NEC forms instead of W-2s. The second is single-member LLCs that have not elected to be taxed as corporations. The IRS treats these as “disregarded entities,” meaning the owner reports business activity directly on Schedule C rather than filing a separate corporate return.
The third group is statutory employees, a narrow category that includes full-time life insurance agents, certain commission drivers, traveling salespersons, and some home-based workers. Statutory employees receive a W-2 with box 13 checked, and they report income and expenses on Schedule C but do not owe self-employment tax on those earnings because Social Security and Medicare were already withheld.2Internal Revenue Service. Instructions for Schedule C (Form 1040) If you have both regular self-employment income and statutory employee income, you need two separate Schedules C.
Multi-member LLCs, partnerships, and corporations do not use Schedule C. They file their own entity returns.
Business or Hobby?
Schedule C is for activities you run with the intent to make money. The IRS distinguishes a business from a hobby by looking at whether you keep accurate books, put in consistent time and effort, depend on the income, and have a realistic shot at turning a profit.3Internal Revenue Service. How to Tell the Difference Between a Hobby and a Business for Tax Purposes No single factor is decisive, but failing to turn a profit in at least three of the last five tax years is a common trigger for scrutiny. If the IRS reclassifies an activity as a hobby, you still owe tax on the income but lose the ability to deduct losses against your wages or other earnings.
What the Form Asks For
The top of Schedule C collects identifying details: your business name, the address where you operate, and either your Social Security Number or an Employer Identification Number. You also pick a six-digit Principal Business Activity code from the North American Industry Classification System list in the instructions.4Internal Revenue Service. Instructions for Schedule C (Form 1040) (2025) The code doesn’t change your tax bill, but a mismatch between the code and the type of income you report can flag the return.
You also choose an accounting method. Most sole proprietors use the cash method, which counts income when money hits your account and expenses when you pay them. The accrual method records income when you earn the right to it and expenses when you become obligated to pay, regardless of when cash moves.5Internal Revenue Service. Publication 538, Accounting Periods and Methods Cash is simpler and dominates among small businesses. Once you pick a method, you generally have to stick with it unless the IRS approves a change.
Part I: Income
Part I captures gross income. You report all business revenue, whether or not you received a 1099 for it. Clients and platforms that paid you $600 or more should send a 1099-NEC, but the absence of a form doesn’t make the income tax-free. Payment processors and marketplace apps issue Form 1099-K when your transactions exceed $20,000 and 200 transactions in a year, a threshold that was reinstated retroactively by the One, Big, Beautiful Bill.6Internal Revenue Service. IRS Issues FAQs on Form 1099-K Threshold Under the One, Big, Beautiful Bill If a 1099-K mixes personal transactions in with business sales, you report the full amount on Schedule C and then back out the personal portion.
Part II: Expenses
Part II lists specific expense categories. To be deductible, an expense must be both ordinary (common in your line of work) and necessary (helpful and appropriate for your business).7Internal Revenue Service. Ordinary and Necessary That standard covers most legitimate costs of running a business, but every deduction needs documentation. Keep receipts, bank statements, and mileage logs for at least three years from the date you file, and six years if you fail to report more than 25% of your gross income.8Internal Revenue Service. How Long Should I Keep Records
Part III: Cost of Goods Sold
If your business sells physical products, Part III calculates cost of goods sold. You start with beginning-of-year inventory, add purchases and labor costs, then subtract ending inventory to figure out what the goods you actually sold cost you.2Internal Revenue Service. Instructions for Schedule C (Form 1040) Small business taxpayers whose average annual gross receipts over the prior three years fall under an inflation-indexed cap ($31 million as of the latest figure) can skip formal inventory tracking and instead treat inventory items as supplies, deducting them when used or sold.9Internal Revenue Service. Publication 334, Tax Guide for Small Business
Deductions Worth Knowing About
A handful of expense categories account for most of the money Schedule C filers save, and they’re also where people most often leave deductions unclaimed or overstep the rules.
Vehicle Costs
You can deduct business driving one of two ways. The standard mileage rate for 2026 is 72.5 cents per mile.10Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents per Mile You multiply that rate by your business miles and take the deduction. The alternative is the actual expense method, where you track gas, repairs, insurance, registration, and depreciation, then deduct the business-use percentage. Actual expenses often produce a larger deduction for expensive vehicles or heavy mileage but demand far more detailed records. Whichever method you pick in the first year you use a vehicle for business generally locks you in for that vehicle’s life.
Home Office
If you use part of your home exclusively and regularly for business, you can claim the home office deduction. “Exclusively” means the space cannot double as a guest room or play area, even occasionally.11Internal Revenue Service. Office in the Home – Frequently Asked Questions The space must also be your principal place of business, a location where you regularly meet clients, or a separate structure like a detached garage or studio.
The simplified method gives you $5 per square foot up to 300 square feet, for a maximum deduction of $1,500.12Internal Revenue Service. Simplified Option for Home Office Deduction The regular method applies the business-use percentage of your home to actual rent or mortgage interest, utilities, insurance, and depreciation. More paperwork, but often a bigger number.
Equipment and Depreciation
Business equipment like computers, machinery, and furniture is normally depreciated over several years. Two provisions speed that up. Section 179 allows you to deduct up to $2,560,000 of qualifying equipment in the year you place it into service, with the deduction beginning to phase out once your total equipment purchases exceed $4,090,000.13Internal Revenue Service. Revenue Procedure 25-32 For most sole proprietors, those ceilings are effectively unlimited. Bonus depreciation, which the One, Big, Beautiful Bill made permanent at 100% for property acquired after January 19, 2025, lets you write off the full cost of new or used qualifying assets in year one.14Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill
Meals
You can deduct 50% of the cost of a meal that’s directly related to business, such as taking a client to lunch or eating while traveling for work. Entertainment expenses like sports tickets or rounds of golf are not deductible at all. If food is served during an entertainment event, the meal portion is still 50% deductible, but only if the food cost is listed or purchased separately from the entertainment.
Self-Employed Health Insurance
If you have a net profit on Schedule C and aren’t eligible for an employer-subsidized health plan through your own job or a spouse’s, you can deduct premiums for medical, dental, and vision insurance for yourself, your spouse, your dependents, and children under 27. This deduction is taken as an adjustment to income on Schedule 1 using Form 7206, not on Schedule C itself.15Internal Revenue Service. Instructions for Form 7206 The plan has to be established under your business, though the policy can be in either the business name or your personal name. Qualifying long-term care premiums and voluntarily paid Medicare premiums count too.
Why the Net Profit Number Matters
The bottom line of Schedule C isn’t just an input to income tax. It also determines what you owe in self-employment tax and shapes several other pieces of your return.
Self-Employment Tax
Your net profit is subject to self-employment tax at a combined rate of 15.3%, covering Social Security (12.4%) and Medicare (2.9%). When you work for an employer, the employer pays half; when you work for yourself, you pay both halves.1Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) The Social Security portion applies only up to an annual wage base; Medicare has no cap. You can deduct half of your self-employment tax as an adjustment to income on Schedule 1, which reduces your adjusted gross income even though it does not reduce the self-employment tax itself.16Internal Revenue Service. Topic No. 554, Self-Employment Tax Newcomers to self-employment routinely miss this deduction.
Estimated Payments
No employer is withholding taxes from your checks, so you’re generally expected to make quarterly estimated payments due April 15, June 15, September 15, and January 15 of the following year.17Internal Revenue Service. Estimated Tax To avoid an underpayment penalty, pay at least 90% of your current-year tax or 100% of last year’s tax, whichever is less. If your prior-year adjusted gross income exceeded $150,000, the safe harbor rises to 110% of last year’s tax.18Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
The QBI Deduction
Schedule C filers may also qualify for the qualified business income deduction under Section 199A, which the One, Big, Beautiful Bill made permanent and increased from 20% to 23%. Eligible taxpayers can deduct up to 23% of qualified business income, which for a sole proprietor is generally net profit from Schedule C after certain adjustments. The deduction is claimed on your personal return, not on Schedule C, and it reduces income tax but not self-employment tax. The rules are straightforward below certain income thresholds and get complicated above them, especially for specified service businesses like law, medicine, consulting, and financial services. The OBBB also added a minimum deduction of $400 for anyone with at least $1,000 in QBI.
Losses
A Schedule C loss can generally offset other income like wages or investment gains, but the excess business loss limitation under Section 461(l) caps how much noncorporate taxpayers can deduct against non-business income, with thresholds that adjust annually for inflation.19Internal Revenue Service. Instructions for Form 461, Limitation on Business Losses Anything above the threshold becomes a net operating loss that carries forward. The hobby rules can also eliminate loss deductions entirely for activities the IRS decides aren’t genuine businesses.
How It Fits Into Your Return
Line 31 of Schedule C, your net profit or loss, transfers to Schedule 1 of Form 1040, line 3.4Internal Revenue Service. Instructions for Schedule C (Form 1040) (2025) If you’re not a statutory employee, the same figure also flows to Schedule SE to calculate self-employment tax. The completed Schedule C is attached to your return.
Filing accurately also matters beyond this year’s tax bill. The Social Security Administration uses your reported self-employment earnings to build the work credits that determine future retirement and disability benefits.20Social Security Administration. If You Are Self-Employed Underreporting to cut taxes today means smaller benefit checks later, and if the IRS later determines you understated your tax, the accuracy-related penalty is 20% of the underpayment, with steeper consequences where fraud is involved.