Schedule C Explained: Who Files It and How

Fact-checked by the LegalGlass editorial team against primary sources · Published Aug 6, 2026 · Last updated Aug 6, 2026

Schedule C (Form 1040), "Profit or Loss From Business (Sole Proprietorship)," is the IRS form that reports the income and expenses of a business you run as a sole proprietor. You file it as an attachment to your Form 1040. Sole proprietors, single-member LLCs, independent contractors, and gig workers use it. The net profit on line 31 flows to Schedule SE, where self-employment tax of 15.3% applies once net earnings reach $400.

Quick Answer

What it is
Schedule C (Form 1040), Profit or Loss From Business (Sole Proprietorship)
Filed with
Form 1040, U.S. Individual Income Tax Return
Who files
Sole proprietors, single-member LLCs (by default), 1099/gig workers
What it reports
Gross receipts, cost of goods sold, expenses, and net profit or loss
Key line
Line 31 - net profit or loss, carried to Schedule 1 and Schedule SE
SE tax trigger
Net earnings of $400 or more → Schedule SE, 15.3% self-employment tax
Cost to file
$0 - Schedule C is part of your Form 1040

What Schedule C Is (Plain English)

Schedule C (Form 1040) is the tax form a sole proprietor uses to report the profit or loss from a business. Its full IRS title is "Profit or Loss From Business (Sole Proprietorship)." The IRS instruction is direct: "Use Schedule C (Form 1040) to report income or (loss) from a business you operated or a profession you practiced as a sole proprietor." It is not a standalone return - it is a schedule attached to your Form 1040, U.S. Individual Income Tax Return.

The schedule works like a one-page profit-and-loss statement: you start with gross receipts, subtract cost of goods sold and every ordinary business expense, and land on net profit or net loss. Because a sole proprietorship is not a separate taxpayer, the business files nothing - the owner reports everything on their own 1040 through Schedule C. An activity only belongs there if it is a genuine business: the IRS requires that "your primary purpose for engaging in the activity is for income or profit and you are involved in the activity with continuity and regularity."

Schedule C exists because the Internal Revenue Code taxes business income to the individual who earns it when no separate entity is taxed. A sole proprietorship has no legal separation from its owner, so the owner's Form 1040 is where the business results land. Two Code sections shape the form. 26 U.S. Code § 162 allows a deduction for "all the ordinary and necessary expenses paid or incurred during the taxable year in carrying on any trade or business" - the basis for every expense line. And 26 U.S. Code § 1402 defines "net earnings from self-employment," derived from net profit, which drives the self-employment tax.

The profit-motive requirement is also statutory. 26 U.S. Code § 183, the "activities not engaged in for profit" rule, denies business deductions for activities carried on without a genuine profit motive - the same standard that separates a business from a hobby. Together, these provisions make Schedule C the mechanism that turns a sole proprietor's receipts and costs into a taxable net figure, subject to both income tax and self-employment tax.

Who Must File Schedule C

You must file Schedule C if you operated a business or practiced a profession as a sole proprietor during the tax year. Per the Instructions for Schedule C, it also applies to taxpayers who may not think of themselves as "business owners." A single-member LLC that has not elected corporate taxation is a "disregarded entity," so its owner files Schedule C exactly as a sole proprietor would. Independent contractors and gig workers who receive Forms 1099-NEC, 1099-K, or 1099-MISC report that income here, as do statutory employees whose Form W-2 is marked in box 13. Spouses who run a business together can elect qualified joint venture status and each file a separate Schedule C for their share.

Files Schedule CDoes not file Schedule C
Sole proprietors running a trade or businessMulti-member LLCs and partnerships (file Form 1065)
Single-member LLCs taxed as disregarded entitiesLLCs or corporations electing S-corp status (file Form 1120-S)
Independent contractors and 1099-NEC recipientsC corporations (file Form 1120)
Gig and platform workers (1099-K, 1099-MISC)Landlords reporting rental real estate (use Schedule E)
Statutory employees (W-2 box 13 checked)Farmers reporting farm income (use Schedule F)
Spouses electing qualified joint venture statusPeople with hobby income (report on Schedule 1)

Schedule C is not for every kind of income: rental real estate goes on Schedule E, farm income on Schedule F, and a business taxed as a partnership or corporation files its own entity return. If you have elected S-corporation treatment, see S-corp vs. LLC and Form 2553 explained, because an S corp reports on Form 1120-S, not Schedule C.

How Schedule C Works: Parts and Line Flow

Schedule C is organized into five parts that move from revenue down to a single net figure, showing how a sole proprietor's raw numbers become taxable income.

The whole schedule funnels to line 31, net profit or loss. Per the Instructions for Schedule C, that figure flows two ways at once: it carries to Schedule 1 (Form 1040) as part of your total income and adjusted gross income, and it carries to Schedule SE to compute self-employment tax. One number taxed on two tracks - the defining feature of sole-proprietor taxation.

Common Deductible Expense Categories

Schedule C, Part II lists the business expenses a sole proprietor can deduct under 26 U.S. Code § 162. An expense is deductible only if it is both "ordinary" (common in your line of work) and "necessary" (helpful and appropriate); personal costs never qualify. Common named categories include:

A home office may be deductible if the space is used regularly and exclusively for business. Because the owner is not an employee, an owner's "salary" is never a Schedule C deduction - the owner is taxed on net profit, whatever they draw. Every deduction must be substantiated with records.

From Schedule C to Schedule SE: Self-Employment Tax

Schedule C net profit is the starting point for self-employment tax, computed on Schedule SE (Form 1040), Self-Employment Tax. This tax covers Social Security and Medicare for people who work for themselves, replacing the payroll taxes an employer would withhold. Per the IRS, the rate is 15.3% - 12.4% for Social Security plus 2.9% for Medicare.

Schedule SE multiplies your Schedule C net profit by 92.35% to reach "net earnings from self-employment," the base defined in 26 U.S. Code § 1402. You must file Schedule SE and pay the tax once those net earnings reach $400 for the year. The 12.4% Social Security portion applies only up to an annual wage base - $176,100 for 2025, adjusted each year - while the 2.9% Medicare portion has no cap. You then deduct one-half of the tax as an above-the-line adjustment on Schedule 1, reducing adjusted gross income. See our self-employment tax guide for the full computation.

This is why forming an entity does not automatically cut self-employment tax: a single-member LLC owner pays the same 15.3% as a bare sole proprietor. Reducing that exposure is why some owners later study an S-corp election via Form 2553, which changes how profit splits between wages and distributions.

Business vs. Hobby: The Profit-Motive Test

Only an activity carried on for profit belongs on Schedule C; a hobby does not. It matters because business expenses are deductible under § 162, while hobby expenses generally are not, and hobby income goes on Schedule 1 (Form 1040), line 8, not on Schedule C. The IRS applies a nine-factor test to decide whether an activity is a business or a hobby, and stresses that "no one factor is more important than another." The factors are:

  1. You carry on the activity in a businesslike manner and keep complete, accurate records.
  2. The time and effort you put in shows you intend to make it profitable.
  3. You depend on income from the activity for your livelihood.
  4. Losses are due to circumstances beyond your control or are normal for a startup phase.
  5. You change your methods of operation to improve profitability.
  6. You and your advisors have the knowledge to run it as a successful business.
  7. You were successful in making a profit in similar activities before.
  8. The activity makes a profit in some years, and how much.
  9. You can expect future profit from the appreciation of assets used in it.

The underlying statute is 26 U.S. Code § 183. If your activity is a genuine business under these factors, you file Schedule C and may deduct a loss; if it is a hobby, you report the income but cannot use the expenses to create a deductible loss.

Recordkeeping for Schedule C Filers

Schedule C filers must keep records that clearly show the income and deductions on the form. The IRS says you "may choose any recordkeeping system suited to your business that clearly shows your income and expenses," and points to Publication 583 for detail. Good records fall into a few buckets: gross receipts (invoices, 1099s, bank deposits), purchases and cost of goods sold, operating expenses (receipts and canceled checks), and asset records that establish basis and depreciation.

The IRS's general rule is to "keep your records as long as needed to prove the income or deductions on a tax return," and to keep employment tax records for at least four years. Two categories draw extra scrutiny: vehicle deductions, which require a contemporaneous mileage log, and the business-versus-personal split of mixed-use costs. If you have employees or need a business bank account, you will also need an EIN, though a solo proprietor can otherwise use a Social Security number.

Frequently Asked Questions

Do I have to file Schedule C if I made no profit?

Generally yes. If you operated a business as a sole proprietor or single-member LLC, you report the activity on Schedule C even at a loss or break-even. A loss on line 31 can offset other income on your Form 1040, subject to at-risk and passive-activity limits.

Is there a minimum income to file Schedule C?

There is no dollar floor for Schedule C itself. Separately, you must file Schedule SE and pay self-employment tax once your net earnings from self-employment reach $400 for the year.

Can two spouses file one Schedule C together?

Not on a single Schedule C unless it is a qualified joint venture. Spouses who each materially participate can elect qualified joint venture status and each file a separate Schedule C for their share, avoiding a partnership return.

What is the difference between Schedule C and Schedule C-EZ?

Schedule C-EZ was a shorter version for simple businesses, but the IRS retired it after the 2018 tax year. All sole proprietors now file the full Schedule C (Form 1040).

Does an LLC file Schedule C?

A single-member LLC does by default. The IRS treats a one-owner LLC as a disregarded entity, so its owner reports income and expenses on Schedule C unless the LLC elects corporate taxation.

Can I deduct a loss from a hobby on Schedule C?

No. Only an activity carried on for profit belongs on Schedule C. If the IRS treats your activity as a hobby, you report the income on Schedule 1 and cannot deduct the expenses under Internal Revenue Code section 183.

Sources

  1. IRS - About Schedule C (Form 1040) (official title, what it reports, who files, business definition).
  2. IRS - Instructions for Schedule C (who must file, five parts, line 31 flow, statutory employees, single-member LLC).
  3. IRS - About Form 1040, U.S. Individual Income Tax Return.
  4. IRS - About Schedule 1 (Form 1040) (business and hobby income reporting).
  5. IRS - About Schedule SE (Form 1040), Self-Employment Tax.
  6. IRS - Self-Employment Tax (15.3% rate, 12.4% + 2.9%, $400 threshold, one-half deduction).
  7. IRS - Instructions for Schedule SE ($400 threshold; $176,100 wage base for 2025).
  8. IRS - Single-Member Limited Liability Companies (disregarded entity; owner files Schedule C).
  9. IRS - Hobby vs. business (nine factors; no single factor decisive).
  10. IRS - Recordkeeping (records that show income and expenses; retention; Publication 583).
  11. IRS - Gig Economy Tax Center (gig workers report on Schedule C).
  12. Cornell LII - 26 U.S. Code § 162, Trade or business expenses.
  13. Cornell LII - 26 U.S. Code § 1402, Definitions (net earnings from self-employment).
  14. Cornell LII - 26 U.S. Code § 183, Activities not engaged in for profit.
  15. Cornell LII - 26 U.S. Code § 6017, Self-employment tax returns.

LegalGlass provides general information for educational purposes and is not a law firm or a substitute for advice from a licensed attorney or tax professional. This page is information, not advice. Tax rates, forms, thresholds, and wage bases change; verify current requirements with the IRS before acting.