Schedule C (Form 1040) Explained: What Counts as Business Income and How to Get It Right in 2026

Schedule C is the form that reports income and expenses from a business you run as a sole proprietor or single-member LLC — think freelancing, consulting, an Etsy shop, or any other side hustle where you’re not formally incorporated or partnered with someone else.

If your business is structured as a partnership, S-corp, C-corp, or multi-member LLC, Schedule C isn’t the right form — those entities file separately (Form 1065 or Form 1120/1120-S) and the income flows to your personal return differently.

What’s Different for 2026

The 1099-K threshold reset. For several years, the IRS was set to lower the 1099-K reporting threshold for third-party payment networks (PayPal, Venmo, Cash App, Stripe) down to just $600 in total payments. OBBBA reversed that and restored the original threshold: platforms only have to issue a 1099-K once you exceed $20,000 in payments AND 200 transactions in a calendar year — both conditions have to be met.

This changes what forms you’ll receive, not what you owe. If you earned $12,000 from freelance design work through a payment app and never crossed the threshold, you won’t get a 1099-K — but you still have to report that $12,000 as business income on Schedule C. The IRS has always required all business income to be reported, form or no form.

The QBI deduction is permanent, with a wider phase-in range. The 20% Qualified Business Income deduction under Section 199A — available to most sole proprietors — was made permanent by OBBBA rather than expiring as originally scheduled. For 2026, the income range over which the deduction phases out for specified service businesses (consulting, law, accounting, and similar fields) widened by $25,000 for single filers and $50,000 for joint filers compared to 2025, giving more filers in those fields access to at least a partial deduction.

100% bonus depreciation returned. Business equipment placed in service after January 19, 2025 qualifies for 100% bonus depreciation, meaning you can deduct the full cost in the year you buy it rather than spreading it over several years.

Filling Out Schedule C: The Basics

Report your gross receipts, then subtract your cost of goods sold (if applicable) and your business expenses to arrive at your net profit or loss, which flows into your adjusted gross income on your personal Form 1040. Common Schedule C expense categories include advertising, car and truck expenses (using the standard mileage rate or actual expenses), home office costs, supplies, and contract labor.

If you have multiple distinct side businesses, you generally need a separate Schedule C for each one — a freelance writing business and an Etsy shop are two different Schedules C, not one combined form.

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Two Worked Examples

Sarah freelances as a graphic designer and nets $65,000 in Schedule C profit for 2025 (filed in 2026). Her self-employment tax is calculated on 92.35% of that net profit ($60,028), at 15.3%, coming to roughly $9,184 — half of which ($4,592) is deductible above the line. Separately, assuming she’s under the QBI phase-in threshold, she can also claim a 20% QBI deduction against her taxable income, worth roughly $13,000.

Marcus runs an Etsy shop on the side and received $18,000 in total payments across 180 transactions through Etsy’s payment processor in 2025. Because he stayed under both the $20,000 and 200-transaction thresholds, he won’t receive a 1099-K for that income. He still must report the full $18,000 as gross receipts on his own Schedule C — the absence of a 1099-K doesn’t reduce his tax obligation.

Common Issues to Watch Out For

Assuming no 1099-K means no taxable income. This is the single most common and costly mistake since the threshold reset. You’re legally required to track and report all business income yourself, with or without a form confirming it.

Mixing personal and business expenses. Only expenses that are ordinary and necessary for the business are deductible — a phone plan used for both personal calls and client work needs a reasonable allocation, not a full deduction.

Filing late or not paying quarterly estimated taxes. Schedule C income isn’t subject to withholding, so if you expect to owe $1,000 or more, you generally need to make quarterly estimated payments throughout the year to avoid an underpayment penalty.

Not tracking mileage and receipts in real time. Reconstructing a year of business expenses from memory in April is where most missed deductions happen — a simple spreadsheet or app updated weekly beats trying to remember everything at tax time.

Overlooking the QBI deduction entirely. Many first-time Schedule C filers don’t realize this deduction exists or assume it only applies to larger businesses — it applies to most sole proprietors regardless of size, subject to the income phase-in ranges, and interacts with your marginal tax bracket since it reduces taxable income rather than your tax bill directly.

Not setting aside money for a retirement account. Self-employed filers have access to retirement plans — a Solo 401(k), SEP IRA, or SIMPLE IRA — that can meaningfully reduce your Schedule C-driven tax bill while building retirement savings, and many freelancers never set one up simply because no employer is prompting them to.