What Is a Schedule C on Taxes and Who Files It?

Schedule C is the IRS tax form that sole proprietors and single-member LLCs attach to their personal Form 1040 to report business profit or loss. The number on Line 31 flows into your 1040 as ordinary income and, once net earnings reach $400, also triggers self-employment tax. Because so many deductions and downstream forms depend on that figure, getting the Schedule C tax form right can save or cost you thousands of dollars.¹

Who Has to File Schedule C

If you run a business by yourself and haven’t formed a corporation or multi-member LLC, you file Schedule C. The IRS treats sole proprietors and single-member LLCs as “disregarded entities,” meaning you and the business are the same taxpayer. All income and expenses flow through your personal Form 1040.¹

Independent contractors and gig workers who receive Form 1099-NEC also use Schedule C. It doesn’t matter whether you drive for a rideshare app, do freelance design, or consult on the side. If you’re paid as a nonemployee, the income belongs here. Statutory employees — a narrow category that includes certain life insurance agents and traveling salespeople — file Schedule C even though they receive a W-2. Look for a checked “Statutory employee” box on that W-2.²

Married couples who jointly run an unincorporated business can elect qualified joint venture status instead of filing a partnership return on Form 1065. Each spouse files a separate Schedule C and Schedule SE based on their ownership share, which builds independent Social Security and Medicare credits for both.

The $400 Net Earnings Threshold

You must report all self-employment income regardless of the amount, but the practical trigger for owing additional tax is $400 in net earnings. Cross that threshold and you owe self-employment tax and must file Schedule SE alongside your Schedule C.³

Business or Hobby

The IRS won’t let you deduct losses from an activity it considers a hobby. The general presumption is that an activity qualifies as a business if it turns a profit in at least three of the last five tax years, or two of seven years for horse-related activities.⁴ That presumption isn’t automatic. The IRS also considers whether you keep proper books, depend on the income, have expertise in the field, and have adjusted your methods to improve profitability.

The distinction matters most when you’re showing consistent losses. If the IRS reclassifies your business as a hobby, you still report the income but lose the ability to deduct expenses against your other earnings.

Information You Need Before You Start

The top section of Schedule C collects identifying details before you get into dollars and cents.⁵

Business name and address. Use the legal name and physical location. If you work from home at the address already on your 1040, you can skip the address line.
Principal Business Code. A six-digit industry code, such as 541511 for custom computer programming or 454110 for electronic shopping and mail-order houses. The full list is at the end of the Schedule C instructions.
Employer Identification Number. Required only if you have employees, file excise tax returns, or maintain a qualified retirement plan. Otherwise, leave the EIN line blank and use your Social Security number.
Accounting method. Most small businesses use the cash method, recording income when received and expenses when paid. Businesses that carry significant inventory may need to use accrual, which matches income to the expenses incurred to earn it.

Reporting Income in Part I

Part I captures everything you earned from the business during the year. Line 1 is your gross receipts, the total revenue before any adjustments. If you received 1099 forms, double-check that the amounts match what you report here. The IRS receives copies of those forms too.²

Line 2 subtracts returns and allowances — refunds you gave customers or price reductions on products. If you sell goods, Part III of the form calculates your cost of goods sold, which also reduces gross income. What remains after these subtractions is your gross profit, the starting point for deductions.

Deductible Business Expenses

Part II is where most of the tax savings happen. Every expense you claim here reduces both your taxable profit and your self-employment tax. The IRS standard is that an expense must be “ordinary and necessary,” meaning common in your industry and helpful for running the business.⁶ The form has dedicated lines for common categories:

Advertising (Line 8). Costs to promote your services, from online ads to business cards.
Insurance (Line 15). Premiums for business liability, malpractice, or property coverage. Health insurance is handled separately, described below.
Office expenses (Line 18). Software subscriptions, postage, and day-to-day supplies.
Repairs and maintenance (Line 21). Fixing equipment or maintaining business property.
Travel (Line 24a). Airfare, hotels, and transportation when you travel away from your tax home for business.

Vehicle Expenses

If you use a vehicle for business, you choose between two methods. The standard mileage rate for 2026 is 72.5 cents per mile.⁷ The alternative is tracking actual costs — gas, insurance, repairs, depreciation — and deducting the business-use percentage. If you own the vehicle, you must choose the standard mileage rate in the first year of business use; after that, you can switch between methods. For leased vehicles, whichever method you start with applies for the entire lease.

Home Office Deduction

If you use part of your home exclusively and regularly for business, you can deduct a portion of your housing costs. The simplified method allows $5 per square foot of dedicated space, up to 300 square feet, for a maximum deduction of $1,500.⁸ The actual expense method uses Form 8829 to calculate a percentage of your mortgage interest or rent, utilities, insurance, and depreciation.⁹ The actual method involves more paperwork but often produces a larger deduction, especially for a sizable dedicated workspace.

Depreciation

Business equipment, furniture, and other assets that last more than a year aren’t deducted all at once. You calculate depreciation on Form 4562 and transfer the result to Schedule C Line 13.¹⁰ The Section 179 election lets you deduct the full cost of qualifying equipment in the year you buy it, which is usually preferable for smaller purchases. Bonus depreciation allows accelerated write-offs for certain assets, though the percentage available has been phasing down.

Meals

Business meals are 50% deductible when you eat with a client, customer, or business associate and the meal has a clear business purpose. The temporary 100% deduction for restaurant meals expired after 2022, so the standard 50% limit applies for 2026. Entertainment costs like tickets to events or golf outings are not deductible at all, though food purchased separately during an entertainment event still qualifies for the 50% deduction.

Health Insurance

Self-employed health insurance premiums, including medical, dental, vision, and qualifying long-term care, are deductible but not on Schedule C. They go on Schedule 1 (Form 1040), Line 17, as an adjustment to income, calculated on Form 7206.¹¹ To qualify, the plan must be established under your business, and you cannot have been eligible to participate in an employer-subsidized health plan through your own other job or your spouse’s employer. This deduction lowers income tax but does not reduce self-employment tax.

Self-Employment Tax

Beyond regular income tax, your Schedule C profit gets hit with self-employment tax, which funds Social Security and Medicare. The combined rate is 15.3%, covering both the employer and employee portions that a W-2 worker would split with a company. The breakdown is 12.4% for Social Security and 2.9% for Medicare.¹²

The Social Security portion applies only to net earnings up to $184,500 in 2026.¹³ The Medicare portion has no cap and applies to every dollar of net self-employment income. If your total earnings exceed $200,000 ($250,000 if married filing jointly), you also owe an additional 0.9% Medicare tax on the amount above that threshold.¹⁴

One partial offset: you can deduct the employer-equivalent half of your self-employment tax (7.65%) as an adjustment to income on Schedule 1. That doesn’t reduce your SE tax itself, but it lowers your adjusted gross income, which affects your income tax bracket and eligibility for various credits.

Quarterly Estimated Tax Payments

Unlike W-2 employees who have taxes withheld from each paycheck, Schedule C filers are responsible for sending payments to the IRS throughout the year. Quarterly estimated payments for the 2026 tax year are due April 15, June 15, September 15, and January 15, 2027.¹⁵

These payments cover both income tax and self-employment tax on your expected earnings. If you underpay, the IRS charges an underpayment penalty. You can generally avoid it if your total tax owed after subtracting withholding and credits is less than $1,000, or if you’ve paid at least 90% of this year’s tax liability or 100% of last year’s. If your prior-year adjusted gross income exceeded $150,000 ($75,000 for married filing separately), the prior-year safe harbor rises to 110%.¹⁶

New business owners frequently underestimate this obligation. If you had a good first year and skipped quarterly payments, you could face both a large tax bill and an underpayment penalty at filing time. Setting aside roughly 25 to 30 percent of net profit throughout the year is a reasonable starting point, though your actual rate depends on your total income and deductions.

The Qualified Business Income Deduction

Schedule C filers may qualify for a deduction worth up to 20% of their qualified business income under Section 199A. The deduction was originally set to expire after 2025 but has been made permanent. It’s calculated on Form 8995 (or Form 8995-A for higher-income filers) and reduces your taxable income. Like the health insurance deduction, it does not reduce self-employment tax.¹⁷

If your taxable income before the QBI deduction is below roughly $201,750 ($403,500 if married filing jointly) for 2026, the calculation is straightforward: 20% of your net Schedule C profit, subject to the overall taxable-income limitation. Above those thresholds, restrictions phase in based on W-2 wages you paid and the value of qualified property in your business.

Certain service-based businesses — law, accounting, health care, consulting, financial services, and similar fields — face additional restrictions. Below the threshold, they qualify for the full deduction. Above the phase-in range (about $276,750 for single filers and $553,500 for joint filers in 2026), they’re excluded entirely. Between those figures, a partial deduction applies.

When Schedule C Shows a Loss

If your expenses exceed your income, Line 31 shows a negative number. That loss generally flows to Schedule 1 and can offset other income on your return, such as wages from a job or a spouse’s earnings.⁵ A loss in one area of your financial life can reduce tax owed on another.

Two sets of rules can limit that benefit. The at-risk rules prevent you from deducting more than you actually have at stake in the business; any portion disallowed carries forward and can be claimed in a future year when you have sufficient at-risk amounts. The excess business loss limitation is a separate ceiling: if your total business losses for the year exceed roughly $305,000 ($610,000 for joint filers, adjusted for inflation), the excess is treated as a net operating loss carryforward rather than a current-year deduction.

Filing Deadlines, Extensions, and Penalties

Schedule C files as part of your Form 1040, which is due April 15, 2026, for the 2025 tax year.¹⁸ If April 15 falls on a weekend or holiday, the deadline shifts to the next business day.

You can get an automatic six-month extension to October 15 by filing Form 4868 or by making an electronic tax payment and designating it as an extension payment. The extension gives you more time to file, but it does not extend the deadline to pay.¹⁹ Any tax you owe is still due April 15, and interest accrues on unpaid balances after that date.

The penalty for filing late is 5% of the unpaid tax for each month or partial month the return is overdue, up to 25%.²⁰ The separate penalty for paying late is much smaller: 0.5% per month of the unpaid balance, also capped at 25%. Filing on time and paying what you can is always better than missing both deadlines, because the filing penalty is ten times steeper than the payment penalty.

How Long to Keep Records

Every deduction you claim on Schedule C needs backup: receipts, bank statements, mileage logs, invoices. The general rule is to keep records for three years after filing the return. Several situations extend that window:²¹

Six years if you underreport income by more than 25% of the gross income on your return.
Seven years if you claim a deduction for worthless securities or a bad debt.
Indefinitely if you don’t file a return or file a fraudulent one.
Property records until at least three years after you sell or dispose of the asset, because the IRS may question your basis.

Keeping digital copies of all business records for at least seven years is the simplest approach. Storage is cheap, and the cost of not having a receipt when the IRS asks for one is always higher.

1
Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship)
2
Internal Revenue Service. Schedule C (Form 1040) 2025 Profit or Loss From Business (Sole Proprietorship)
3
Internal Revenue Service. Self-Employment Tax
4
Internal Revenue Service. Is Your Hobby a For-Profit Endeavor?
5
Internal Revenue Service. Instructions for Schedule C (Form 1040) (2025)
6
Office of the Law Revision Counsel. 26 U.S. Code 162 – Trade or Business Expenses
7
Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents per Mile, Up 2.5 Cents
8
Internal Revenue Service. Simplified Option for Home Office Deduction
9
Internal Revenue Service. About Form 8829, Expenses for Business Use of Your Home
10
Internal Revenue Service. Form 4562 – Depreciation and Amortization (Including Information on Listed Property)
11
Internal Revenue Service. Instructions for Form 7206
12
SSA. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet
13
SSA. Contribution and Benefit Base
14
Internal Revenue Service. Topic No. 560, Additional Medicare Tax
15
Taxpayer Advocate Service. Making Estimated Payments
16
Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
17
Internal Revenue Service. 2025 Instructions for Form 8995 – Qualified Business Income Deduction Simplified Computation
18
Internal Revenue Service. When to File
19
Internal Revenue Service. Application for Automatic Extension of Time to File U.S. Individual Income Tax Return
20
Internal Revenue Service. Failure to File Penalty
21
Internal Revenue Service. How Long Should I Keep Records