A sole proprietor filing single with no other income can earn up to $16,100 in net profit in 2026 before owing any federal income tax, because that’s the standard deduction that wipes out taxable income at that level.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 The Qualified Business Income deduction can push that number higher still. But how much income a small business can make without paying taxes depends on which tax you’re asking about: self-employment tax starts biting at just $400 of net earnings, and it applies whether or not you owe a dime of income tax.2Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
Revenue Is Not What Gets Taxed
The IRS does not tax the money that flows into your business. It taxes what’s left after ordinary and necessary business expenses come out.3Internal Revenue Service. Publication 334 (2025), Tax Guide for Small Business A shop that rings up $200,000 in sales but spends $190,000 on inventory, rent, utilities, and other operating costs has $10,000 in net profit. That $10,000 is the number that matters. A freelancer who bills $30,000 with almost no overhead may end up with more taxable profit than the shop.
So the real question is how much net profit — not gross revenue — you can generate before you owe. And the answer depends on your filing status and what other deductions you can claim.
The 2026 Standard Deduction Threshold
For pass-through business owners (sole proprietors, single-member LLCs, partners, S corporation shareholders), business profit flows to your personal Form 1040. Once it lands there, the standard deduction knocks it down before any income tax is calculated. The 2026 standard deduction amounts are:1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
- Single or married filing separately: $16,100
- Head of household: $24,150
- Married filing jointly: $32,200
If your business is your only source of income and your net profit stays at or below the standard deduction for your filing status, your federal taxable income is zero. A married couple filing jointly with no other income could clear $32,200 in net profit and still owe no federal income tax.
How the QBI Deduction Raises the Threshold
The Qualified Business Income deduction, extended by the One Big Beautiful Bill Act, lets eligible pass-through owners deduct up to 20% of their qualified business income on top of the standard deduction.4Internal Revenue Service. Qualified Business Income Deduction Because it stacks, the true zero-federal-income-tax threshold is higher than the standard deduction alone.
Take a single filer with $20,000 in net business profit and no other income. The QBI deduction removes 20% ($4,000), leaving $16,000. The $16,100 standard deduction then wipes that out. Federal taxable income: zero. Without QBI, that same filer would have $3,900 in taxable income.
The QBI deduction cannot exceed 20% of your overall taxable income calculated before the QBI deduction itself. For 2025, straight 20% applies below $197,300 (single) or $394,600 (joint); above those thresholds, wage and property limits kick in, and some service-based businesses lose eligibility.5Internal Revenue Service. Instructions for Form 8995 (2025) The 2026 thresholds will be adjusted for inflation.
The $400 Self-Employment Tax Trap
Zero federal income tax does not mean zero taxes. Self-employment tax is a separate obligation that funds Social Security and Medicare, and it applies to every dollar of net self-employment earnings once those earnings exceed $400 for the year.2Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare. Those are the employer and employee shares combined, because as a self-employed person you’re both. The IRS first reduces your net earnings by 7.65% (multiplying by 92.35%) before applying the 15.3% rate.6Internal Revenue Service. Topic No. 554, Self-Employment Tax
Run the math on a single filer sitting right at the $16,100 income tax threshold. Their self-employment tax is $16,100 × 0.9235 × 15.3% = roughly $2,275. So a business that “pays no taxes” under the standard deduction still hands the government about $2,275 in self-employment tax. Half of that self-employment tax is deductible on your personal return as an above-the-line adjustment, which lowers your adjusted gross income (and can lower future income tax) but does not lower the self-employment tax itself.2Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
The practical takeaway: the only net profit level at which a self-employed person owes no federal tax at all is under $400.
Deductions That Move the Threshold Higher
Because the threshold is calculated on net profit, every legitimate business deduction pushes the ceiling up. Federal law allows you to deduct any expense that is ordinary (common in your industry) and necessary (helpful and appropriate for the business).7Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses Common categories include cost of goods sold, rent and utilities, professional services, supplies and software, and depreciation.
A few deductions are especially worth knowing about because owners routinely miss them:
- Vehicle expenses at the 2026 standard mileage rate of 72.5 cents per business mile, or actual costs.8Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents per Mile
- Home office: $5 per square foot up to 300 square feet ($1,500 cap) under the simplified method, or actual expenses under the regular method.9Internal Revenue Service. Simplified Option for Home Office Deduction
- Self-employed health insurance: 100% of premiums for you, your spouse, and your dependents, taken on your personal return, provided you weren’t eligible for an employer-subsidized plan.10Internal Revenue Service. Instructions for Form 7206
Fines and penalties, lobbying, political contributions, and personal expenses don’t qualify.7Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses If you can’t document an expense, the IRS treats it as if it didn’t happen.
Tax Credits Can Zero Out What’s Left
Credits reduce tax dollar-for-dollar, so they’re more powerful than deductions of the same size. The Child Tax Credit is worth up to $2,200 per qualifying child in 2026, with phase-outs that don’t begin until $200,000 (single) or $400,000 (joint) of modified AGI.11Internal Revenue Service. Child Tax Credit If your income tax bill is already small, a credit like this can eliminate it entirely — though it does nothing to reduce self-employment tax.
State and Local Taxes Don’t Follow Federal Rules
Zeroing out your federal income tax doesn’t zero out your state obligation. Most states tax business profits under their own rules, rates, and deductions. A few have no individual income tax; others tax from the first dollar.
Some states also charge minimum franchise or gross receipts taxes that apply whether or not you turned a profit. These flat fees generally run from $50 to $800 per year depending on the state and entity type. LLCs and corporations usually owe an annual report fee as well, and skipping it can get the business administratively dissolved even while it’s operating normally.
You Still Have to File and Pay Quarterly
Nothing withholds tax from a small business owner’s income, so the IRS expects quarterly estimated payments covering both income tax and self-employment tax.12Internal Revenue Service. Estimated Taxes The 2026 deadlines are April 15, 2026; June 15, 2026; September 15, 2026; and January 15, 2027.13Internal Revenue Service. Form 1040-ES (2026)
You can generally avoid the underpayment penalty if your total tax due after withholding and estimated payments is under $1,000, or if you paid at least 90% of the current year’s tax or 100% of last year’s tax (110% if your prior-year AGI exceeded $150,000).14Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
Missing the annual return itself is more expensive. Failure to file runs 5% of unpaid tax per month up to 25%, with a minimum penalty of $525 or 100% of the unpaid tax (whichever is less) if you’re more than 60 days late.15Internal Revenue Service. Failure to File Penalty Failure to pay adds 0.5% per month, up to 25%, dropping to 0.25% if you’re on an approved payment plan.16Internal Revenue Service. Failure to Pay Penalty
Even a business that owes no income tax needs to file if net self-employment earnings hit $400. Filing on time, even if you can’t pay in full, avoids the steeper failure-to-file penalty.