Schedule C is the IRS form you attach to your Form 1040 to report income and expenses from a business you run yourself. Sole proprietors, freelancers, independent contractors, and single-member LLC owners use it to calculate net profit or loss, and that bottom-line number drives both the income tax and the self-employment tax you owe for the year.
Who Has to File
The trigger is $400. Once your net earnings from self-employment reach that amount in a year, you owe self-employment tax and need Schedule C to calculate the figure.1Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) The rule applies even if you’re already collecting Social Security or Medicare.
You’re a Schedule C filer if you fall into any of these groups:
- Sole proprietors running an unincorporated business alone.
- Freelancers and gig workers earning through platforms, contracts, or client work.
- Independent contractors who receive 1099-NEC forms rather than W-2s.
- Single-member LLC owners. The IRS treats these as disregarded entities by default, so the owner reports business activity on Schedule C unless Form 8832 has been filed to elect corporate treatment.2Internal Revenue Service. Single Member Limited Liability Companies
- Statutory employees, whose W-2 has the “Statutory employee” box checked and who are treated as self-employed for purposes of business deductions.
Report every dollar of self-employment income whether or not a 1099 shows up in the mail. Clients and payment processors aren’t always required to send one, but the income is still taxable.3Internal Revenue Service. What to Do With Form 1099-K If you run more than one business, file a separate Schedule C for each.
One boundary to keep in mind. If the IRS decides your activity is a hobby rather than a business, you can’t deduct expenses against the income. The tax code creates a presumption that your activity is a business if it turns a profit in at least three out of five consecutive years, or two out of seven for horse-related activities.4Office of the Law Revision Counsel. 26 U.S. Code 183 – Activities Not Engaged in for Profit Falling short doesn’t automatically kill the classification, but consistent losses attract scrutiny.
Reporting Your Income
Part I of the form captures what the business brought in. Line 1 is gross receipts, the total revenue from sales, services, or fees before any adjustments. Refunds and returns come off on Line 2.5Internal Revenue Service. Instructions for Schedule C (Form 1040) – Line 2
Businesses that sell physical products also complete Part III to calculate cost of goods sold. You enter beginning inventory, add purchases and any direct labor or materials, then subtract ending inventory. The result on Line 42 gets subtracted from net sales to produce the gross income figure on Line 7.6Internal Revenue Service. Schedule C (Form 1040) 2025 – Part III Service businesses with no inventory skip Part III.
The form’s header (Lines A through G) asks for a business description, a six-digit industry code, your business name if different from your own, an EIN if you have one, your accounting method, and whether you materially participated. Solo operators without employees typically use their Social Security number in place of an EIN. Answering “no” to material participation can trigger passive activity rules that restrict how much of a loss you can deduct.7Internal Revenue Service. Instructions for Schedule C (Form 1040) – Line G
Reporting Your Expenses
Part II is where most of the tax savings happen. Every ordinary and necessary cost of running the business reduces taxable income. The form lists specific categories (advertising, insurance, supplies, professional services, rent, interest on business loans), plus a catch-all in Part V for anything that doesn’t fit a named line. Line 28 totals everything, and subtracting that from gross income gives the net profit or loss on Line 31.
A few categories cause the most confusion.
Vehicle Use
You have two options for business driving. The standard mileage rate for 2026 is 72.5 cents per mile.8Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents per Mile, Up 2.5 Cents Alternatively, track actual expenses (gas, insurance, repairs, depreciation) and multiply by the percentage of business use. If you own the vehicle and want to use the standard rate, choose it in the first year you use the car for business. For leased vehicles, whichever method you pick applies for the entire lease.
Home Office
If you use part of your home regularly and exclusively for business, you can deduct a portion of your housing costs. The simplified method gives you $5 per square foot, capped at 300 square feet, for a maximum $1,500 deduction.9Internal Revenue Service. Simplified Option for Home Office Deduction The regular method requires calculating the actual percentage of your home used for business and applying that percentage to real costs like utilities, insurance, mortgage interest, and repairs.10Internal Revenue Service. Publication 587 – Business Use of Your Home The regular method involves more paperwork but often produces a larger deduction.
Meals
You can deduct 50% of the cost of meals with clients, customers, or business contacts, as long as you or an employee are present and the meal isn’t extravagant.11Internal Revenue Service. Tax Cuts and Jobs Act – Businesses Entertainment (sporting events, concerts, golf outings) is not deductible at all.
Equipment
Expensive business equipment normally has to be depreciated over several years. Section 179 lets you deduct the full purchase price the year you buy it, up to $1,250,000 for tax years beginning in 2025, phasing out once total equipment purchases exceed $3,130,000.12Internal Revenue Service. Instructions for Form 4562 Bonus depreciation, a separate provision, drops to 20% of qualifying asset cost for 2026 and disappears entirely after 2026 unless Congress acts. Section 179 and depreciation are reported on Form 4562, which feeds Line 13 of Schedule C.
Every expense needs backup documentation: receipts, bank statements, invoices, or digital records. The IRS doesn’t require a specific format, but the detail has to be enough to prove each expense if asked.13Internal Revenue Service. Recordkeeping
What Happens to the Bottom-Line Number
The figure on Line 31 flows to two places. It goes to Schedule 1 of Form 1040, where it becomes part of adjusted gross income and gets taxed at your regular rate. If it’s a profit, it also goes to Schedule SE for the self-employment tax calculation.
Self-Employment Tax
This catches many first-time filers off guard. Employees split Social Security and Medicare taxes with their employer. Self-employed workers pay both halves. The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.1Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
The Social Security portion applies only to net earnings up to $184,500 in 2026.14Social Security Administration. Contribution and Benefit Base The Medicare portion has no cap. If your self-employment income exceeds $200,000 ($250,000 for married couples filing jointly), an additional 0.9% Medicare tax applies to the amount above the threshold.
You can deduct half of your self-employment tax as an adjustment to income on Form 1040. That reduces your income tax, though it doesn’t reduce the self-employment tax itself.1Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
Qualified Business Income Deduction
Section 199A gives most sole proprietors a deduction worth up to 20% of qualified business income. This is a separate income tax deduction, available whether you itemize or take the standard deduction.15Internal Revenue Service. Qualified Business Income Deduction Below the 2026 thresholds (roughly $201,750 for single filers, $403,500 for joint filers), the calculation is 20% of net Schedule C profit, limited to 20% of taxable income minus net capital gains.16Office of the Law Revision Counsel. 26 U.S.C. 199A – Qualified Business Income Above the threshold, restrictions phase in. Service-based businesses (law, accounting, health care, consulting, financial services) face steeper limits and eventually lose the deduction at higher income levels. The deduction is set to expire after 2025 unless Congress extends it, so check current guidance before relying on it.
If You Have a Loss
A loss on Line 31 can generally offset other income on your return, including W-2 wages, investment income, or a spouse’s earnings on a joint return. Two limits apply. Passive activity rules restrict losses if you didn’t materially participate. An excess business loss limitation caps how much business loss can offset non-business income in a single year. Any disallowed loss carries forward as a net operating loss.17Internal Revenue Service. Instructions for Schedule C (Form 1040) – Excess Business Loss Limitation
Paying Tax Through the Year
Because no employer is withholding tax from your income, you send estimated payments to the IRS four times a year. You generally need to make these payments if you expect to owe $1,000 or more when you file.18Internal Revenue Service. 2026 Form 1040-ES Estimated Tax for Individuals
The 2026 quarterly deadlines:
- First quarter: April 15, 2026
- Second quarter: June 15, 2026
- Third quarter: September 15, 2026
- Fourth quarter: January 15, 2027
You can skip the January payment if you file your 2026 return and pay the balance in full by February 1, 2027.18Internal Revenue Service. 2026 Form 1040-ES Estimated Tax for Individuals
To avoid an underpayment penalty, pay at least the smaller of 90% of your 2026 tax or 100% of your 2025 tax through estimated payments and any withholding. If your 2025 adjusted gross income exceeded $150,000 ($75,000 if married filing separately), the safe harbor is 110% of last year’s tax instead of 100%.19Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty Underpayment is one of the most common and avoidable penalties for self-employed people.
Filing, Deadlines, and Records
Schedule C doesn’t file on its own. It attaches to your Form 1040. Most people file electronically through tax software, which handles the attachment automatically. The standard deadline for calendar-year filers is April 15, 2026, for the 2025 tax year.20Internal Revenue Service. When to File If the date falls on a weekend or holiday, it shifts to the next business day.
Filing late when you owe triggers a penalty of 5% of the unpaid tax for each month or partial month the return is overdue, up to 25%.21Internal Revenue Service. Failure to File Penalty An extension gives you six extra months to submit the return but does not extend the deadline to pay. If you expect to owe, send a payment by April 15 even if you need more time to finish the paperwork.
Keep records for as long as they’re needed to prove the income or deductions on your return.13Internal Revenue Service. Recordkeeping In practice, hold onto receipts, bank statements, mileage logs, and invoices for at least three years from the date you filed. Keep them six years if you underreported income by more than 25%, and indefinitely if you never filed at all. Digital copies are fine as long as they’re legible.