Tax and audit statistics are among the most misquoted numbers online, often pulled from marketing blogs with no clear source. This page uses the IRS's own data instead: its filing season statistics, the annual IRS Data Book, and the federal tax gap projections.
Every figure below links to its source, with the tax year or Data Book edition noted. This is general information for business owners, not tax advice; check your own situation with a qualified tax professional.
Key Tax and Audit Statistics at a Glance
- U.S. taxpayers had filed about 142.2 million individual income tax returns by late April 2026, roughly flat versus the same point in 2025 (IRS).
- The IRS issued 95.7 million refunds totaling $312.9 billion, an average refund of $3,268, up 11% from a year earlier (IRS).
- About 98% of individual returns were e-filed, calculated from IRS counts (IRS).
- The IRS examined just 0.36% of individual returns for tax years 2015 to 2023 (IRS Data Book, FY2025).
- Audit odds rise steeply with income; returns reporting $10 million or more were examined at 6.6% for tax year 2021, versus well under 1% for most filers (IRS Data Book, FY2025).
- The projected gross tax gap for tax year 2022 was $696 billion, with a net gap of $606 billion (IRS).
- Underreporting accounts for 77% of the gross tax gap, or $539 billion (IRS).
- The voluntary compliance rate held at about 85% (IRS).
The 2026 Filing Season by the Numbers
The scale of U.S. tax filing is large and steady. As of late April 2026, the IRS had received about 142.2 million individual income tax returns and processed roughly 140.9 million, per the IRS filing season statistics. Extension filers continue through October, so the full-year total rises further.
Refunds were the standout story in 2026. The IRS issued 95.7 million refunds worth $312.9 billion, and the average refund climbed to $3,268, up 11% from the same point a year earlier.
Electronic filing is now nearly universal. About 98% of returns were e-filed, and tax professionals submitted more than half of those, a reminder that most filers do not file alone.
| Metric | 2026 | Change vs. same point in 2025 |
|---|---|---|
| Individual returns received | 142,225,000 | Down 0.2% |
| Returns e-filed | 139,221,000 | Up 1.2% |
| Refunds issued | 95,743,000 | Up 6.1% |
| Total amount refunded | $312.882 billion | Up 17.8% |
| Average refund | $3,268 | Up 11.0% |
Figures are cumulative, comparing April 25, 2025 with April 24, 2026. Refund figures cover current-year returns.
IRS Audit Rates: How Likely Is an Audit?
Audits are far rarer than the headlines suggest. According to the FY2025 IRS Data Book, the IRS had examined just 0.36% of individual income tax returns filed for tax years 2015 through 2023, and coverage for corporation returns was also well under 1%. In fiscal year 2025, the IRS closed 497,621 audits in total, recommending $26.8 billion in additional tax (IRS).
The averages hide a steep income gradient. For tax year 2021, the most recent year outside the audit statute of limitations, examination coverage climbed sharply with income, as shown below (IRS Data Book, FY2025).
| Total positive income (tax year 2021) | Exam coverage rate |
|---|---|
| $1 million to $5 million | 0.9% |
| $5 million to $10 million | 3.9% |
| $10 million or more | 6.6% |
There is a second peak at the bottom of the income scale. The IRS reviews refundable-credit eligibility closely, so lower-income returns that claim the Earned Income Tax Credit are examined at an above-average rate (IRS Data Book, FY2025).
How an audit is conducted also matters. The IRS examines returns both through the mail (correspondence audits) and in person (field audits), with field audits generally reserved for larger or more complex returns (IRS).
The Tax Gap and Small Business Compliance
The tax gap is the difference between what taxpayers owe and what they pay on time. The IRS projected a gross tax gap of $696 billion for tax year 2022 and a net gap of $606 billion after late payments and enforcement, per its 2022 tax gap projections.
Underreporting is the largest component by far. It made up $539 billion, or 77% of the gross gap, ahead of underpayment at $94 billion (14%) and non-filing at $63 billion (9%).
| Component of the gross tax gap (TY2022) | Amount | Share |
|---|---|---|
| Underreporting | $539 billion | 77% |
| Underpayment | $94 billion | 14% |
| Non-filing | $63 billion | 9% |
The pattern behind underreporting is directly relevant to small businesses. The IRS notes consistently in its tax gap analysis that compliance is much higher when income is verified by third-party reporting, such as wages on a Form W-2, and higher still when tax is withheld. The IRS matches these Forms W-2 and 1099 against filed returns to flag discrepancies.
Income with little or no third-party reporting, such as sole-proprietor and other pass-through business income, accounts for a larger share of underreporting. When no one files a matching information return, accurate reporting depends on the business owner's own records.
That is where bookkeeping matters. Clean, consistent records can help keep reported income accurate and make it easier to respond if the IRS ever asks questions.
For corporate tax rates and revenue trends specifically, see FinStackk's companion research page, Corporate Tax Statistics (https://www.finstackk.com/research/corporate-tax-statistics).
Frequently Asked Questions
What are the odds of being audited?
The IRS examined about 0.36% of individual income tax returns for tax years 2015 through 2023, per the FY2025 IRS Data Book. For most filers the odds are well under 1%, though they rise with income.
Who gets audited the most?
The highest earners face the greatest scrutiny. For tax year 2021, returns reporting $10 million or more were examined at 6.6%, compared with well under 1% for most filers. At the other end, lower-income filers who claim the Earned Income Tax Credit are also examined at an above-average rate.
How many tax returns are filed each year?
U.S. taxpayers had filed about 142.2 million individual income tax returns by late April 2026, nearly all of them electronically, according to the IRS filing season statistics. Extension filers continue through October, so the annual total rises further.
What is the average tax refund?
The average refund in 2026 was $3,268 through late April, up 11% from the same point a year earlier. The IRS issued 95.7 million refunds totaling $312.9 billion (IRS).
What is the tax gap?
The tax gap is the difference between taxes owed and taxes paid on time. The IRS projected a gross gap of $696 billion and a net gap of $606 billion for tax year 2022, with a voluntary compliance rate of about 85% (IRS).
Why is small business income underreported more than wages?
Wages are reported to the IRS by employers on Form W-2, so they are easy to verify and tend to be reported accurately. Much small business and self-employment income has no matching third-party report, which is why it accounts for a larger share of the underreporting tax gap.
Sources and Methodology
This page uses IRS primary data only. Secondary estimates of small business audit rates by revenue or industry that circulate online are excluded, because they are not traceable to IRS tables. Tax years and Data Book editions are labeled because audit-coverage figures accumulate over time as examinations close.
- IRS: 2026 Filing Season Statistics. Returns filed, refunds, and e-file figures (cumulative through April 24, 2026).
- IRS Data Book, FY2025 (Publication 55-B). Examination (audit) coverage for individual and corporation returns.
- IRS: 2022 Tax Gap Projections (release IR-2024-262, and Publication 5869). Gross and net tax gap, components, and voluntary compliance rate.
Methodology note: The IRS Data Book cited here is the FY2025 edition. Its examination-coverage rates are cumulative for the tax years shown and rise as more audits are completed, so a single year's rate is not directly comparable to a cumulative figure. Tax gap projections are estimates and, the IRS notes, cannot fully capture every form of noncompliance.
How FinStackk Helps
The tax gap data has a direct implication for small businesses: because so much business income is not independently reported to the IRS, accurate reporting depends on good records.
FinStackk is an accounting and tax compliance platform built for U.S. businesses. It helps owners keep accurate, audit-ready records and file correctly and on time:
- Fin-Books for ongoing bookkeeping that keeps reported income accurate.
- Fin-Tax for business tax filings and a compliance calendar so deadlines are not missed.
Update History
- October 2026: Initial publication. Figures reflect the IRS 2026 filing season statistics (cumulative through April 24, 2026), the FY2025 IRS Data Book (examination coverage for tax years 2015 to 2023), and the IRS 2022 tax gap projections.