- How Many Small Business Tax Filers There Are
- Tax Rates by Entity Type
This guide collects 35+ small business tax statistics for 2026, with the primary source linked next to each figure. It covers filer counts, effective tax rates by entity type, IRS audit rates, the Section 199A qualified business income deduction, self-employment tax, and the compliance burden small business owners report year after year.
How we verified this Filer counts and audit rates come from the IRS Statistics of Income (SOI), the IRS Data Book, and the Treasury Department. Entity-level effective rates come from SBA Office of Advocacy and Tax Foundation analyses of IRS data. Survey-based numbers (compliance time, owner sentiment, planning behavior) come from NFIB tax surveys and the Tax Foundation business tax compliance cost study. Where a stat is from a vendor or trade publication, we say so.
Most "small business tax" content online recycles four or five numbers with no source link. This page rebuilds the picture from IRS SOI tables, the IRS Data Book, the Tax Foundation, and NFIB primary survey data.
Key Takeaways
- The SBA Office of Advocacy 2025 Small Business Profile counts 36.2 million small businesses in the U.S., 99.9% of all U.S. businesses.
- Roughly 83% of small businesses are pass-through entities (sole proprietorships, partnerships, S corporations, single-member LLCs), per Tax Foundation analysis.
- The IRS's Section 199A qualified business income deduction was claimed by more than 25.9 million taxpayers in 2021, the most recent full-year data.
- The self-employment tax rate is 15.3% on the first $168,600 of net earnings (2024 wage base), per the IRS self-employment tax page.
- The IRS audited about 0.5% of all returns overall in recent years per the IRS Data Book, with rates lower for partnerships and S corporations than for sole proprietors and large corporations.
- The Tax Foundation's business tax compliance cost survey reports that small businesses face disproportionately high compliance costs per dollar of revenue compared to larger firms.
How Many Small Business Tax Filers There Are
The SBA Office of Advocacy 2025 Small Business Profile gives the cleanest count of how many businesses are filing.
- The U.S. has 36.2 million small businesses.
- Small businesses represent 99.9% of all U.S. businesses.
- 5.52 million employer firms (1-499 employees) operated in 2022.
- 29.8 million nonemployer businesses (sole proprietors without paid employees) operated in 2022.
- Small businesses account for nearly 46% of private-sector employment.
The IRS SOI tax stats for individual returns with small business income shows tens of millions of individual returns report Schedule C, Schedule E, or Schedule F income each year. The exact figure shifts year to year but consistently sits in the 27-30 million range for Schedule C (sole proprietor) returns alone.
For context on share of business returns overall, the Tax Foundation half-century review found that since 1950, small businesses have paid about 9% of total federal income tax on an average annual basis.
Tax Rates by Entity Type
This is the single most-searched and most-misquoted topic in the category. The headline "small businesses pay 19.8%" line gets repeated everywhere, but the underlying breakdown matters more than the average.
Nationwide's analysis of SBA data cites these average effective tax rates by entity type:
| Entity type | Average effective federal tax rate |
|---|---|
| Sole proprietorship | 13.3% |
| Small partnership | 23.6% |
| Small S corporation | 26.9% |
| All small businesses (weighted average) | 19.8% |
These figures come from older SBA analysis; treat them as directional rather than current-year IRS-confirmed numbers. Effective rates depend heavily on income level, deductions taken, and state tax exposure.
C corporations pay a flat federal rate of 21% on taxable income, set by the Tax Cuts and Jobs Act and unchanged since 2018, per IRC Section 11.
Pass-through entities (sole proprietorships, partnerships, S corporations, most LLCs) pay tax at the owner's individual marginal rate. The 2024 federal income tax brackets per the IRS are:
- 10% on income up to $11,600 (single) / $23,200 (MFJ)
- 12% on income up to $47,150 / $94,300
- 22% on income up to $100,525 / $201,050
- 24% on income up to $191,950 / $383,900
- 32% on income up to $243,725 / $487,450
- 35% on income up to $609,350 / $731,200
- 37% above those thresholds
For a sole proprietor netting $100,000, the practical tax burden is the marginal federal income tax (mostly 22%), plus state income tax, plus self-employment tax (effectively about 14.13% of net earnings, since the deductible half of SE tax adjusts the calculation).
Self-Employment Tax Statistics
The IRS self-employment tax page confirms:
- The self-employment tax rate is 15.3%, composed of 12.4% for Social Security and 2.9% for Medicare.
- For 2024, only the first $168,600 of net earnings is subject to Social Security tax. The 2.9% Medicare portion has no cap.
- Self-employed taxpayers pay SE tax on 92.35% of net self-employment earnings.
- The IRS requires SE tax filing from anyone with net self-employment earnings of $400 or more in the year.
- Self-employed taxpayers can deduct half of SE tax as an adjustment to gross income on Form 1040.
The effective SE tax burden on $100,000 of net Schedule C income is about $14,130 (15.3% of 92.35% of $100,000). Combined with federal income tax at the standard 22% marginal rate and no state tax, that brings a single-filer total federal tax burden around $25,600 on $100,000 of net business income, per TurboTax SE tax calculations.
Section 199A Qualified Business Income Deduction
Section 199A is the most consequential pass-through tax provision of the last decade.
The IRS qualified business income deduction page explains:
- Eligible pass-through owners may deduct up to 20% of qualified business income on their individual return.
- The deduction is also available on 20% of qualified REIT dividends and qualified publicly traded partnership income.
- Above income thresholds (about $200,000 single / $400,000 MFJ for the 2026 OBBBA-adjusted limits), special rules apply for specified service trades or businesses (law, accounting, consulting, health, financial services).
Per the American Farm Bureau analysis:
- More than 25.9 million businesses claimed a 199A deduction in 2021, the most recent full IRS SOI year.
- The provision is estimated to support over 2.6 million workers and generate about $325 billion of GDP per year through retained business cash.
- More than 45% of all farm families (over 850,000 farms and ranches) claim the 199A deduction.
The One Big Beautiful Bill Act, signed July 4, 2025, made the QBI deduction permanent and adjusted the phase-out thresholds. For tax year 2026, the full deduction is generally available below about $200,000 single / $400,000 MFJ, with phase-outs to about $275,000 / $550,000.
IRS Audit Rate Statistics
The IRS Compliance Presence data and the most recent IRS Data Book (FY 2024, released May 2025) show audit rates have continued their long-running decline.
Approximate audit rates by entity type, based on IRS Data Book historical patterns:
| Entity / return type | Approximate audit rate |
|---|---|
| Individual returns (overall) | ~0.4% - 0.5% |
| Schedule C, gross receipts $25K-$100K | ~1.2% - 1.8% |
| Schedule C, gross receipts $100K-$200K | ~2% - 3% |
| Partnerships (Form 1065) | <0.5% |
| S corporations (Form 1120-S) | <0.5% |
| C corporations, assets <$10M | ~0.5% - 1% |
| C corporations, assets $10M+ | progressively higher |
These ranges describe the most recent years of available IRS Data Book data; specific year-to-year rates shift with IRS enforcement focus.
Treasury policy guidance after the Inflation Reduction Act directed the IRS not to increase audit rates above historical levels for households and small businesses earning under $400,000, per Treasury and IRS statements. Enforcement focus shifted to high-income taxpayers, large partnerships, and large corporations.
Time Spent on Taxes by Small Businesses
The compliance burden, measured in hours, is one of the most consistent complaints in NFIB surveys.
The NFIB Small Business Tax Surveys and the Tax Foundation business tax compliance cost survey consistently report that:
- A majority of small business owners spend significant time on federal tax compliance beyond paying for professional preparation.
- More than 60% of NFIB members operate with fewer than 10 employees, magnifying compliance cost as a share of revenue.
- Most small business owners do not believe tax code changes will reduce complexity, with 55% in the 2024 NFIB survey saying so.
- The IRS estimates from the Form 1040 instructions place individual return preparation time at approximately 13 hours on average, with self-employed filers reporting substantially higher burden because of Schedule C, Schedule SE, and Form 8995 (QBI) calculations.
- The IRS Schedule C instructions include a separate paperwork-reduction time estimate for recordkeeping and form preparation, which is materially higher than the Form 1040 base estimate.
NFIB Small Business Tax Concerns Statistics
Per the NFIB Problems and Priorities Survey and the related 2024 NFIB Tax Survey:
- Federal taxes on business income rank as a top-five problem for small business owners, with about a quarter of owners calling it a critical problem (up about 5 points over four years).
- State taxes on business income rank second among tax concerns, with 22% of owners calling it critical.
- A majority of small business owners (55%) do not believe potential tax code changes will reduce complexity.
- The 2024 NFIB tax findings were based on 2,873 responses from a mail survey of NFIB members, conducted from February through mid-April 2024.
The NFIB Small Business Optimism Index for April 2026 sat at 95.9, below the 52-year average of 98.0. Cash flow and tax burden both feature in owner comments as ongoing concerns.
Common Small Business Deductions Statistics
The IRS Schedule C instructions categorize the deductions most commonly reported by sole proprietors. The largest dollar-volume categories on Schedule C historically include:
| Schedule C deduction | Typical share of small business expense |
|---|---|
| Car and truck expenses | Common across service businesses |
| Contract labor | Significant for construction, professional services |
| Office expense and supplies | Universal |
| Rent / lease (vehicles, equipment) | Significant for capital-intensive businesses |
| Insurance (other than health) | Universal for employers |
| Utilities | Universal for storefront / office businesses |
| Travel and meals | Subject to the 50% meals limitation |
| Wages (line 26) | Largest single category for employer firms |
| Depreciation | Significant for asset-heavy businesses |
| Home office (Form 8829) | Used by roughly a third of Schedule C filers per SOI data trends |
The IRS Section 179 expense election and bonus depreciation allowed accelerated deduction of qualifying capital purchases, with the 2026 thresholds set by IRC Section 179. For 2024, the Section 179 limit was $1.16 million with a phase-out beginning at $2.89 million in total purchases.
The $600 Reporting Rule
One of the most-searched tax questions among small business owners is "What is the $600 rule?"
The IRS Form 1099-K page explains the rule and its phased rollout:
- Original American Rescue Plan threshold: payment processors must issue Form 1099-K to recipients of more than $600 in aggregate payments, with no transaction-count minimum.
- The IRS delayed implementation and is phasing in lower thresholds: the reporting threshold for tax year 2024 was set at $5,000, the 2025 threshold at $2,500, and the 2026 threshold at $600, per IRS Notice 2023-74 and subsequent IRS guidance.
- The threshold change does not change taxability. Self-employment income is taxable whether or not a 1099-K is issued.
This rule has nothing to do with the long-standing $600 threshold for issuing Form 1099-NEC to independent contractors, which has been in place since the 1099-NEC was reintroduced for tax year 2020.
Small Business Tax Software Adoption
The IRS's filing season statistics consistently show:
- More than 90% of individual returns are filed electronically.
- The IRS reports approximately 93% of small businesses file their taxes on time, per industry analysis cited by Business Initiative.
- Among small business filers, paid preparer use is high. Roughly 60% of all individual returns are signed by a paid preparer, with the share substantially higher among Schedule C filers.
The IRS's free Direct File and Free File programs are growing but remain a small share of total filings, and Direct File does not yet support Schedule C in most states.
What These Small Business Tax Statistics Mean
Three patterns repeat across IRS, SBA, and NFIB sources.
Pass-through entities dominate small business tax. About 83% of small businesses pay tax through the owner's individual return rather than through the corporate code. Anything that changes individual marginal rates or the QBI deduction has a much larger effect on small business cash flow than corporate rate changes.
Compliance burden is a structural cost, not a one-time inconvenience. The NFIB and Tax Foundation data is consistent on this. Compliance cost as a share of revenue is much higher for the smallest businesses, and the typical owner spends meaningful time each quarter on bookkeeping, payroll filings, and quarterly estimated taxes in addition to the annual return.
Audit risk for most small businesses is low. Pass-through entities (partnerships and S corporations) face audit rates well below 0.5%. Sole proprietors with larger gross receipts face higher rates, but still single-digit percentages. The risk profile changes sharply at higher income brackets and for businesses with unusual deduction patterns.
If you take one operational change from these numbers, make it this: keep clean books year-round, separate business from personal banking, and use a CPA or EA for the annual filing if your structure is anything other than the simplest sole proprietorship. The compliance cost is real, but the cost of errors and missed deductions is consistently higher.
Stop scrambling at tax time. Try Billed free to track invoices, income, and expenses so your books are ready when your tax preparer is.
When this guide isn't for you
These statistics describe U.S. federal tax data for small businesses on average. They do not cover state-by-state variation, which can shift effective rates by 5-10 percentage points. They do not cover specialized industries (farming, fishing, real estate professional rules, oil and gas) where additional code sections apply. They do not address payroll tax compliance in detail. If your business is multi-state, multi-entity, or in a heavily-regulated industry, treat these numbers as a starting point and work with a CPA who specializes in your situation.
Frequently Asked Questions
How much do most small businesses pay in taxes?
The most commonly cited figures, from SBA-based analysis, are average effective federal rates of about 13.3% for sole proprietorships, 23.6% for small partnerships, 26.9% for small S corporations, and 19.8% as a weighted average across all small businesses. These are averages, not statutory rates. Actual liability depends on entity type, income level, and deductions taken.
What is the 20% tax deduction for small business owners?
The Section 199A qualified business income deduction lets eligible pass-through owners deduct up to 20% of qualified business income on their individual tax return. The deduction is available to sole proprietors, partnerships, S corporations, and most LLCs taxed as pass-throughs. The One Big Beautiful Bill Act of 2025 made the deduction permanent and adjusted phase-out thresholds, per the IRS QBI deduction page.
How many businesses make over $500,000 a year?
IRS SOI data shows the share of small business returns reporting more than $500,000 in gross receipts is a relatively small portion of the total. Most sole proprietor Schedule C returns report gross receipts under $100,000. Higher-revenue small businesses are more often structured as partnerships, S corporations, or LLCs.
What is the $600 rule?
The $600 rule refers to the IRS Form 1099-K reporting threshold for payment processors. The threshold is being phased in: $5,000 for tax year 2024, $2,500 for 2025, and $600 for 2026, per IRS Notice 2023-74. Receiving a 1099-K does not change whether income is taxable; self-employment income is taxable regardless.
What is the small business tax audit rate?
Overall IRS audit rates have run around 0.4% to 0.5% of individual returns in recent years. Schedule C filers face higher rates, especially at higher gross-receipts levels. Partnership (Form 1065) and S corporation (Form 1120-S) audit rates run below 0.5%. Treasury has directed the IRS not to increase small business audit rates above historical levels for filers with income under $400,000.