You can write off business expenses without an LLC. The moment you earn money from freelance work, a side business, or any independent trade, the IRS treats you as a sole proprietor by default, and sole proprietors deduct ordinary business costs on the same Schedule C that a single-member LLC uses.1Internal Revenue Service. Sole Proprietorships No registration, no filing fee, no separate entity required. What matters is that each expense is genuinely tied to your business and that you have records to prove it.
What Sole Proprietor Status Gives You
You and your business are the same taxpayer. Your business income and expenses flow onto your personal Form 1040 through Schedule C, and the net profit is taxed at your regular individual rate.1Internal Revenue Service. Sole Proprietorships That single-return structure is the whole reason no LLC is needed to claim deductions: the deductions live on your personal return either way.
Forming an LLC does not, on its own, unlock any additional federal deductions. A single-member LLC that hasn’t elected corporate treatment files the exact same Schedule C you would file as an unregistered sole proprietor. The tax rules for what you can and cannot write off are the same.
What Counts as a Deductible Business Expense
Federal law lets you deduct any expense that is both ordinary and necessary for your line of work. Ordinary means common and accepted in your industry. Necessary means helpful and appropriate — it does not have to be indispensable.2Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses
Personal expenses stay off the return, even when they brush against your work. Commuting from home to a regular workplace, clothes you could wear outside work, and meals you would eat anyway all fall on the personal side of the line.3Office of the Law Revision Counsel. 26 USC 262 – Personal, Living, and Family Expenses When a cost has both a business and a personal use, such as a phone plan or home internet, only the business-use portion is deductible.
You Need a Profit Motive
The activity has to be a business, not a hobby. If it fails to turn a profit in at least three of the last five tax years, the IRS may presume it is a hobby. You can rebut that presumption with evidence of a genuine profit motive, but if the activity is ultimately classified as a hobby, your losses cannot offset other income.4Office of the Law Revision Counsel. 26 USC 183 – Activities Not Engaged in for Profit
Startup Costs
In your first year, you can deduct up to $5,000 in startup costs immediately. That allowance drops dollar-for-dollar once total startup spending exceeds $50,000 and disappears at $55,000. Anything not deducted right away is spread evenly across the next 180 months.5Office of the Law Revision Counsel. 26 USC 195 – Start-up Expenditures
The Deductions Sole Proprietors Actually Use
Vehicle Expenses
If you drive for business — to client sites, on deliveries, between work locations — you can deduct the cost. The simplest approach is the standard mileage rate, which for 2026 is 72.5 cents per mile.6Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile, Up 2.5 Cents You keep a log with the date, destination, business purpose, and odometer readings. The alternative is to track actual expenses like gas, insurance, and repairs, then deduct the business-use percentage.
Home Office
If you use part of your home regularly and exclusively for business, you can claim a home office deduction. The simplified method is $5 per square foot, capped at 300 square feet, for a maximum of $1,500. The actual-expense method deducts the business-use share of rent or mortgage interest, utilities, insurance, and depreciation, which can produce a bigger write-off if your housing costs are high, at the price of more detailed records.7Internal Revenue Service. Simplified Option for Home Office Deduction
Self-Employed Health Insurance
Sole proprietors with a net profit can deduct premiums paid for health coverage for themselves, a spouse, dependents, and any children under age 27 even if those children are not dependents. This deduction is taken as an adjustment to income on Schedule 1, so it lowers your adjusted gross income directly. You cannot claim it for any month you were eligible for coverage through your own or a spouse’s employer.8Internal Revenue Service. Instructions for Form 7206
Retirement Contributions
A SEP-IRA lets you contribute up to 25 percent of net self-employment earnings, with a 2026 ceiling of $72,000. A solo 401(k) combines an employee elective deferral of up to $24,500 with employer-side contributions, reaching the same $72,000 combined cap. If you are 50 or older, the solo 401(k) allows a catch-up contribution of up to $8,000, with an enhanced catch-up of up to $11,250 available ages 60 through 63.
Other Common Write-Offs
- Advertising and marketing, including website hosting, online ads, business cards, and promotional materials
- Supplies and equipment, including computers, software subscriptions, office supplies, and tools of the trade
- Professional services, including accounting fees, legal consultations, and tax preparation
- Business travel, including airfare, hotels, and meals at 50 percent when you are away overnight for work
- Education that maintains or improves skills in your current field, such as courses, workshops, and publications
- Business insurance, including liability and professional malpractice coverage
Where the Deductions Go: Schedule C
Schedule C is where the numbers land. Part I reports gross income. Part II lists expense categories — advertising, insurance, office expense, travel, and so on — each on its own line. Income minus expenses gives you net profit or loss, which then flows to your Form 1040.9Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss From Business (Sole Proprietorship)
You will need your Social Security number and a six-digit business activity code describing what you do. Clients who paid you $2,000 or more should send a Form 1099-NEC; that reporting threshold increased from $600 to $2,000 for payments made after December 31, 2025.10Internal Revenue Service. Form 1099 NEC and Independent Contractors Whether or not a 1099-NEC arrives, all income you earned is reportable.
Records That Back Up Your Deductions
Every deduction has to be defensible. Keep receipts, bank and credit card statements, invoices, and contracts showing the amount, date, and business purpose of each expense. Keep a mileage log for vehicle use, and document the square footage of any home workspace relative to your total home.
Digital copies are fine. The IRS accepts records stored electronically as long as they are legible, unaltered, and retrievable. Hold on to records for at least three years from the date you filed the return, or two years from the date you paid the tax, whichever is later. If you underreported income by more than 25 percent, the retention window stretches to six years. If you never filed at all, keep them indefinitely.11Internal Revenue Service. How Long Should I Keep Records?
Two Tax Items Sole Proprietors Should Know About
Self-Employment Tax
Deductions reduce your income tax, but self-employment tax is a separate layer. It covers your Social Security and Medicare contributions, and because there is no employer to split the bill, you pay both halves — a combined 15.3 percent (12.4 percent Social Security and 2.9 percent Medicare).12Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) It kicks in once net self-employment earnings reach $400.13Internal Revenue Service. Topic No. 554, Self-Employment Tax
The calculation multiplies your net self-employment earnings by 92.35 percent to reach the taxable base, then applies 15.3 percent.13Internal Revenue Service. Topic No. 554, Self-Employment Tax The 12.4 percent Social Security portion applies only to earnings up to $184,500 for 2026; the 2.9 percent Medicare portion has no cap.14Social Security Administration. Contribution and Benefit Base Once net self-employment income exceeds $200,000 (or $250,000 for married couples filing jointly), an additional 0.9 percent Medicare surtax applies to earnings above that threshold. You can deduct one-half of your self-employment tax as an adjustment to income, which lowers your income tax but not the self-employment tax itself.
Qualified Business Income Deduction
The Section 199A deduction lets sole proprietors deduct up to 20 percent of qualified business income from taxable income, on top of every expense already claimed on Schedule C.15Internal Revenue Service. Qualified Business Income Deduction It was made permanent by the One Big Beautiful Bill Act, signed in July 2025.
If your taxable income is below roughly $197,300 for single filers or $394,600 for joint filers, the math is a flat 20 percent of net business income. Above those thresholds, limits based on W-2 wages and business property apply, and specified service businesses like law, health care, consulting, and financial services face a phase-out that can eliminate the deduction at higher incomes. It is claimed on your personal return and does not require any particular business structure.
Quarterly Estimated Payments
Because no employer is withholding taxes from your pay, the IRS expects you to pay as you go. Estimated payments are generally required if you expect to owe $1,000 or more when you file.16Internal Revenue Service. Estimated Taxes For the 2026 tax year, the due dates are April 15, 2026; June 15, 2026; September 15, 2026; and January 15, 2027.17Internal Revenue Service. Publication 509 (2026), Tax Calendars
Missing or underpaying an installment can trigger an underpayment penalty even if you settle the full balance when you file. The safe harbor is to pay either 100 percent of last year’s total tax or 90 percent of the current year’s expected tax, split into four roughly equal installments.