There is no single "small business tax rate" in the United States. What you actually pay is driven by your entity type: a C-corporation pays a flat 21% federal income tax on its profit, while pass-through businesses — sole proprietorships, partnerships, LLCs, and S-corporations — pay no entity-level federal income tax and instead pass profit to the owner's personal return, where it is taxed at individual rates of 10% to 37%. On top of that, self-employed owners and partners owe 15.3% self-employment tax (Social Security and Medicare) on net earnings, and most businesses also face state income tax, payroll tax, and sales tax. In practice, most Main Street owners' true federal blend lands somewhere in the low-20s to mid-30s percent once income tax and self-employment tax stack together.
Key takeaways
- C-corporations pay a flat 21% federal income tax on profit; pass-through businesses pay no entity-level federal income tax and are taxed on the owner's return at 10%–37%.
- Self-employed owners and general partners owe 15.3% self-employment tax (Social Security + Medicare) on net earnings, on top of income tax.
- The 20% QBI deduction (Section 199A) can meaningfully lower a pass-through owner's effective rate, subject to income phase-outs.
- An S-corp election can reduce self-employment tax by taxing only a reasonable W-2 salary, with remaining profit taken as distributions.
- State income tax is additional and ranges from roughly 0% to 13%; nine states have no personal income tax.
- Effective rate is driven more by entity structure and deductions than by the headline bracket — your marginal rate and effective rate are different numbers.
- Tax timing, not just the rate, is what strains cash flow; quarterly estimates fall due whether or not deposits line up that month.
The three federal tax layers every owner pays
To understand your rate, separate the federal bill into its layers. Almost every small business touches at least two of these.
- Income tax — a flat 21% at the entity level for C-corps, or your marginal individual bracket (10%–37%) for pass-through profit reported on your personal return.
- Self-employment / payroll tax — 15.3% on net self-employment earnings (12.4% Social Security up to the annual wage base, plus 2.9% Medicare with no cap; an extra 0.9% Medicare surtax applies at higher incomes). For W-2 employees and S-corp owners, this is split as employer/employee payroll tax instead.
- State and local tax — most states add their own income tax (roughly 0% to 13% depending on the state), and many add franchise taxes, gross-receipts taxes, or local levies. Nine states have no personal income tax at all.
Your effective rate is the sum of these layers minus deductions and credits — not any single headline number. Two businesses earning identical profit can pay very different totals based purely on structure and state.
C-corporation rate: the flat 21%
Since the 2017 Tax Cuts and Jobs Act, C-corporations pay a flat 21% federal income tax on taxable profit — no brackets, no graduated schedule. That is the entity's tax. The catch is double taxation: when the corporation distributes profit to owners as dividends, those dividends are taxed again on the shareholder's personal return (qualified dividends generally at 0%, 15%, or 20% plus the 3.8% net investment income tax for higher earners).
For an owner who wants to retain earnings inside the business to fund growth, 21% can be attractive. For an owner who needs to pull most profit out as personal income every year, the second layer of dividend tax often makes a pass-through structure cheaper. This is the core trade-off a CPA models before recommending a C-corp election.
Pass-through rates: sole props, partnerships, LLCs, and S-corps
The large majority of US small businesses are pass-throughs. The business itself pays no federal income tax; profit "passes through" to the owners, who report it on their personal 1040 and pay at individual rates. Those 2026 individual brackets run from 10% up to 37%, applied marginally — only the dollars inside each bracket are taxed at that bracket's rate.
Two features shape the real pass-through rate:
- The 20% QBI deduction (Section 199A) — many pass-through owners can deduct up to 20% of qualified business income before applying their bracket, which meaningfully lowers the effective rate. Phase-outs and limits apply for higher earners and certain service businesses.
- Self-employment tax — sole proprietors and general partners owe the full 15.3% on net earnings. An S-corporation election is a common way to reduce this: the owner pays themselves a reasonable W-2 salary (subject to payroll tax) and takes remaining profit as a distribution that is not subject to self-employment tax. That salary must be genuinely reasonable, or the IRS will recharacterize it.
Federal rate cheat sheet by entity
The table below shows how the same profit is treated very differently by structure. Rates shown are federal only; state tax is additional. Figures are illustrative starting points, not a substitute for a CPA's projection.
| Entity type | Entity-level income tax | Owner-level income tax | Self-employment / payroll tax | QBI deduction eligible? |
|---|---|---|---|---|
| Sole proprietorship | None | 10%–37% (marginal) | 15.3% on net earnings | Yes |
| Partnership / multi-member LLC | None | 10%–37% on each partner's share | 15.3% on general partners' share | Yes |
| S-corporation | None | 10%–37% on pass-through profit | Payroll tax on reasonable salary only | Yes |
| C-corporation | Flat 21% | Dividend tax on distributions (0/15/20% + NIIT) | Payroll tax on wages paid | No |
The single-member LLC by default is taxed as a sole proprietorship; it becomes a distinct tax story only when it elects S-corp or C-corp treatment.
Realistic effective-rate examples
These examples show how the layers combine into a real-world blended rate. All numbers are labeled for example and rounded for illustration; your actual result depends on deductions, credits, state, and filing status.
| Scenario (for example) | Structure | Approx. net profit | Main federal layers | Illustrative blended federal rate |
|---|---|---|---|---|
| Solo contractor, single filer | Sole prop | $85,000 | Income tax (~12–22% marginal) + 15.3% SE tax, less QBI | ~20%–25% |
| Two-owner service firm | S-corp | $200,000 | Bracket on profit + payroll tax on salaries only, less QBI | ~18%–24% |
| Growing retailer retaining earnings | C-corp | $300,000 | Flat 21% entity tax (dividends deferred) | ~21% until distributed |
| High-earning consultant | Sole prop | $450,000 | Top brackets + SE tax + additional Medicare surtax | ~30%–35% |
Notice the pattern: structure and the QBI deduction move the effective rate more than raw profit does. The C-corp looks cheapest until the owner needs the cash personally and triggers the second layer.
Decision framework: managing the bill through cash flow
Tax rate is one problem; tax timing is the one that actually breaks businesses. Estimated payments are due quarterly, and profit on paper rarely matches cash in the bank on the day the payment is due. Owners routinely owe a large April or quarterly bill during a slow-revenue stretch. When that happens, some choose to preserve working capital by funding the tax payment rather than draining every reserve. A revenue-based advance or MCA-style marketplace — where approval rests on your bank deposits and revenue rather than credit score, typically starting around $10,000, FICO 500+, funded in 24–48 hours — is one tool for smoothing that timing gap.
This approach can work best when:
- You have a confirmed, non-negotiable tax deadline and steady deposits, but the cash and the due date are out of sync.
- Draining your reserve to pay the IRS would leave you unable to make payroll or restock.
- You expect near-term revenue (booked jobs, seasonal upswing) that will comfortably support the repayment.
Reconsider or avoid when:
- The underlying problem is that the business is unprofitable, not merely out of sync on timing — financing a structural loss compounds it.
- You could realistically set up an IRS installment agreement at a lower cost, and the timeline allows it.
- Your deposits cannot comfortably absorb daily or weekly remittance on top of operating costs.
Reserve the smarter long game for next year: adjust your quarterly estimates, bank a dedicated tax percentage from every deposit, and revisit your entity election with a CPA. For the mechanics of matching financing to revenue, see our business funding pillar and guide to revenue-based financing.
Deductions and credits that lower your real rate
Headline rates overstate what most businesses pay because taxable income comes after deductions. The levers that move your effective rate the most:
- Ordinary and necessary business expenses — rent, wages, supplies, software, insurance, professional fees, and the like reduce taxable profit dollar for dollar.
- Section 179 and bonus depreciation — let you expense qualifying equipment and vehicles faster instead of depreciating over years, front-loading the deduction in a high-income year.
- The 20% QBI deduction — as noted, a major reduction for eligible pass-through owners.
- Retirement contributions — a SEP-IRA or Solo 401(k) can shelter a substantial share of profit while building the owner's retirement.
- Credits — dollar-for-dollar reductions such as the R&D credit or hiring-related credits are worth more than deductions of the same size.
The practical takeaway: your marginal bracket and your effective rate are different numbers. Good bookkeeping and a proactive CPA are what close the gap.
How to plan so the tax bill never surprises you
The owners who never get caught by a tax bill treat it as a scheduled expense, not an annual shock. A workable routine:
- Set aside a fixed percentage of every deposit into a separate tax account — many operators park 25%–30% of profit and reconcile at year end.
- Pay quarterly estimates on time to avoid underpayment penalties, and true them up as the year's numbers firm up.
- Run a mid-year projection with your CPA so a strong year doesn't produce a Q4 scramble.
- Revisit your entity election annually — an S-corp election, in particular, can pay for itself once profit clears roughly the low six figures.
When timing still bites — and it does, even for well-run businesses — you want to know your funding options in advance rather than deciding under deadline pressure. Line them up before you need them.
Frequently asked questions
What is the small business tax rate in the US?
There is no single rate. C-corporations pay a flat 21% federal income tax on profit. Pass-through businesses (sole props, partnerships, LLCs, S-corps) pay no entity-level federal income tax; profit is taxed on the owner's personal return at individual rates of 10% to 37%, plus 15.3% self-employment tax on net earnings for most owners. State income tax is additional.
Do LLCs have a special tax rate?
No. An LLC has no default tax rate of its own. By default a single-member LLC is taxed as a sole proprietorship and a multi-member LLC as a partnership, so profit is taxed at the owner's individual rates plus self-employment tax. An LLC can elect to be taxed as an S-corp or C-corp to change how it is taxed.
What is the 15.3% self-employment tax?
It is Social Security (12.4%, up to the annual wage base) plus Medicare (2.9%, no cap) on net self-employment earnings, paid by sole proprietors and general partners who have no employer splitting the payroll tax with them. An additional 0.9% Medicare surtax applies above certain income thresholds. An S-corp election can reduce it by limiting payroll tax to a reasonable salary.
How does the 20% QBI deduction work?
Section 199A lets many pass-through owners deduct up to 20% of qualified business income before applying their tax bracket, which lowers the effective rate. Phase-outs and limits apply for higher earners and certain specified service businesses, so eligibility should be confirmed with a CPA.
Is a C-corp's 21% rate cheaper than being a pass-through?
Sometimes. The 21% flat rate is attractive if you retain earnings inside the business. But distributing profit as dividends triggers a second layer of tax on your personal return (double taxation). If you pull most profit out each year, a pass-through structure with the QBI deduction is often cheaper. Model it with a CPA.
What can I do if I owe taxes but do not have the cash right now?
First explore an IRS installment agreement, which is often the lowest-cost option. If the issue is timing rather than profitability — you have steady deposits but the cash and the due date are out of sync — some owners use a revenue-based advance to cover the bill and preserve working capital. Approval is based on bank deposits and revenue rather than credit, typically from around $10,000, FICO 500+, funded in 24–48 hours. It should never be presented as guaranteed, and it only makes sense when near-term revenue can comfortably support repayment.
How much should I set aside for taxes as a small business?
As a general planning rule, many owners reserve roughly 25% to 30% of profit in a separate account and reconcile at year end. Your right number depends on entity type, state, filing status, and deductions, so confirm the percentage with your accountant and adjust after a mid-year projection.
Do I still owe tax if my business had no profit?
You generally owe no federal income tax on business profit when there is none, and a loss can offset other income in many cases. But you may still owe other taxes — payroll tax on wages you paid, sales tax you collected, and certain state franchise or minimum taxes that apply regardless of profit. File returns even in a loss year to preserve the loss and stay compliant.
