Do I file a Schedule C if I'm a sole proprietor?
Yes. If you operate as a sole proprietor, Schedule C (Profit or Loss from Business) is where you report all your business income and deductible expenses. It gets attached to your personal Form 1040 when you file your tax return. The net profit from Schedule C flows into your personal return and determines what you owe in income tax and self-employment tax.
This applies whether you have an LLC or not. A single-member LLC is treated as a sole proprietorship for federal tax purposes unless you’ve elected to be taxed as an S-Corp or C-Corp. So if you formed an LLC but didn’t make any election with the IRS, you’re still filing Schedule C.
On Schedule C you’ll report all the revenue your business earned during the year. Then you’ll deduct your business expenses: materials, tools, vehicle costs, insurance, subcontractor payments, advertising, phone, and anything else that’s ordinary and necessary for your trade. The difference between revenue and expenses is your net profit, and that’s the number you pay taxes on.
For contractors and tradespeople, the expenses section is where accurate bookkeeping really matters. A plumber who bought $15,000 in parts and materials during the year but didn’t track them properly might only claim $8,000 because that’s all they can find receipts for. That missing $7,000 in deductions means paying taxes on profit you didn’t actually earn. Having contractor bookkeeping services in place throughout the year prevents that from happening.
Self-employment tax is the part that catches many sole proprietors off guard. On top of regular income tax, you owe 15.3% on your net profit for Social Security and Medicare. When you work for someone else, the employer covers half. As a sole proprietor, you cover both halves. On $80,000 of net profit, that’s over $12,000 just in self-employment tax before income tax even enters the picture.
A few things to keep in mind when filing. If you paid any subcontractor $600 or more during the year, you’re required to issue them a 1099-NEC. The IRS cross-references these, so skipping them creates problems. You also need to report all income, including cash jobs. Unreported income is one of the most common audit triggers for sole proprietors in the trades.
If your business has grown and your tax bill feels painful, it might be worth looking at whether a different entity structure makes sense. Filing Schedule C is straightforward, but it’s not always the most tax-efficient option once your profits reach a certain level. That’s a conversation worth having with someone who handles business tax returns and can run the numbers for your specific situation.
Schedule C itself isn’t complicated. What makes it go wrong is bad recordkeeping throughout the year that leads to missed deductions, underreported income, or a scramble every April. Keep your books current and the Schedule C practically fills itself out.
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