Reference Hub
Tax Data & Statistics Hub: 2026 IRS Data, Historical Rates & Economic Facts
The TaxCalcHQ Tax Data Hub aggregates key US tax statistics including historical federal tax brackets, standard deduction amounts, AMT exemptions, IRS filing data, state tax rates, taxpayer demographics, and federal revenue figures all in one place with source citations.
Data Sources and Methodology
The tax data presented on this hub is compiled from the following authoritative sources:
- IRS Statistics of Income (SOI) Division — Annual reports on individual and corporate tax returns, including the IRS SOI Bulletin and the Integrated Business Data
- IRS Data Book — Annual publication with IRS filing, enforcement, and taxpayer assistance statistics
- Congressional Budget Office (CBO) — Federal revenue projections, tax expenditure estimates, and budget analysis
- Tax Policy Center (Urban Institute & Brookings Institution) — Tax model estimates and distributional analysis
- Tax Foundation — State tax rate compilations, international tax comparisons, and tax reform analysis
- Bureau of Economic Analysis (BEA) — National income and product accounts (GDP data)
- Joint Committee on Taxation (JCT) — Revenue estimates and tax expenditure reports
All data is cited to the original source. Users are encouraged to verify critical statistics against the original government publications. Data is updated annually as new IRS and CBO reports are released.
Key Tax Statistics for 2026
Here are the most important inflation-adjusted tax figures for the 2026 tax year:
| Item | 2026 Amount |
|---|---|
| Standard Deduction (Single) | $14,600 |
| Standard Deduction (Head of Household) | $21,900 |
| Standard Deduction (Married Filing Jointly) | $29,200 |
| Personal Exemption | $0 (suspended through 2025) |
| Social Security Wage Base | $176,100 |
| AMT Exemption (Single) | $88,100 |
| AMT Exemption (Married Filing Jointly) | $137,000 |
| 401(k) Employee Contribution Limit | $23,500 |
| IRA Contribution Limit | $7,000 |
| Catch-Up Contribution (Age 50+) | $1,000 (IRA) / $7,500 (401k) |
| Annual Gift Tax Exclusion | $18,000 |
| Estate Tax Exemption | $13,990,000 |
| SEP IRA Contribution Limit | $70,000 |
| HSA Contribution Limit (Self) | $4,300 |
| HSA Contribution Limit (Family) | $8,550 |
Historical Tax Brackets
The federal income tax system is progressive, with marginal tax rates ranging from 10% to 37% in 2026. Here is a look at how the top marginal rate has changed over recent decades:
| Year | Top Marginal Rate | Top Rate Threshold (Single) | Number of Brackets |
|---|---|---|---|
| 1980 | 70% | $215,400 | 15 |
| 1986 | 50% | $88,270 | 14 |
| 1988-1990 | 28% | $29,750 | 2 |
| 1993-1996 | 39.6% | $250,000 | 5 |
| 2002 | 38.6% | $307,050 | 6 |
| 2003-2012 | 35% | $388,350 | 6 |
| 2013-2017 | 39.6% | $470,700 | 7 |
| 2018-2025 | 37% | $609,350 | 7 |
| 2026 | 37% | $609,351 | 7 |
The 2017 Tax Cuts and Jobs Act (TCJA) reduced the top rate from 39.6% to 37% and simplified the bracket structure. These individual rates are scheduled to sunset after 2025 unless Congress acts to extend them. Under current law, the rates would revert to pre-2018 levels, meaning the top rate would return to 39.6% starting in 2026. However, there have been ongoing legislative discussions about extending the TCJA rates.
Standard Deduction History
The standard deduction has increased significantly over time, especially after the TCJA nearly doubled it in 2018. Here is the historical progression:
| Year | Single | Head of Household | Married Filing Jointly |
|---|---|---|---|
| 2010 | $5,700 | $8,400 | $11,400 |
| 2015 | $6,300 | $9,250 | $12,600 |
| 2017 | $6,350 | $9,350 | $12,700 |
| 2018 | $12,000 | $18,000 | $24,000 |
| 2019 | $12,200 | $18,350 | $24,400 |
| 2020 | $12,400 | $18,650 | $24,800 |
| 2021 | $12,550 | $18,800 | $25,100 |
| 2022 | $12,950 | $19,400 | $25,900 |
| 2023 | $13,850 | $20,800 | $27,700 |
| 2024 | $14,600 | $21,900 | $29,200 |
| 2025 | $15,000 | $22,500 | $30,000 |
| 2026 | $14,600 | $21,900 | $29,200 |
The standard deduction is indexed for inflation annually. The significant jump in 2018 was due to the TCJA, which nearly doubled the standard deduction while eliminating personal exemptions. The TCJA also eliminated or limited many itemized deductions, making the standard deduction the better choice for most taxpayers.
Federal Revenue Breakdown
Federal revenue comes from a mix of individual income taxes, payroll taxes, corporate taxes, and other sources. For fiscal year 2025, total federal receipts were approximately $5.2 trillion:
- Individual income taxes: ~$2.6 trillion (50%) — The largest source of federal revenue
- Payroll taxes: ~$1.8 trillion (36%) — Social Security, Medicare, and unemployment taxes
- Corporate income taxes: ~$550 billion (10%) — Tax on corporate profits
- Other sources: ~$250 billion (4%) — Excise taxes, estate and gift taxes, customs duties, and Federal Reserve remittances
Federal revenue as a percentage of GDP has averaged 17.4% historically. In FY 2025, federal revenue was approximately 18.1% of GDP, slightly above the historical average. Federal spending was approximately 23% of GDP, resulting in a deficit of about $1.5 trillion.
The composition of federal revenue has shifted over time. In the 1950s, corporate taxes contributed about 30% of federal revenue and individual taxes contributed about 42%. By the 2020s, individual taxes contributed 50% and corporate taxes fell to 10%, reflecting both tax rate reductions and the shift to pass-through business structures.
Taxpayer Demographics
The IRS processed over 165 million individual tax returns for tax year 2024. Here are key demographic statistics based on the most recent complete IRS data:
Filing status distribution: Among all returns filed, approximately 40% were Single, 42% were Married Filing Jointly, 15% were Head of Household, and 3% were other statuses (Qualifying Widow/er and Married Filing Separately).
Income concentration: The top 1% of taxpayers (AGI over approximately $600,000) earn roughly 22% of total adjusted gross income and pay approximately 42% of total federal income taxes. The bottom 50% of taxpayers (AGI under approximately $50,000) earn about 11% of total AGI and pay approximately 3% of total federal income taxes.
Refund statistics: Approximately 65% of filers receive a tax refund each year. The average refund for tax year 2024 was approximately $3,100. Direct deposit was used for 95% of refunds, with most refunds issued within 21 days of e-filed return acceptance.
E-filing adoption: Over 93% of individual tax returns are now e-filed, with the remaining returns filed on paper. The IRS continues to encourage electronic filing for faster processing and reduced errors.
IRS Audit Rates by Income
IRS audit rates vary significantly by income level, with higher-income taxpayers facing substantially higher audit probabilities. Here are the audit rates for the most recent complete filing year:
| Income Range | Audit Rate |
|---|---|
| Under $25,000 | 0.2% |
| $25,000 to $50,000 | 0.3% |
| $50,000 to $75,000 | 0.3% |
| $75,000 to $100,000 | 0.3% |
| $100,000 to $200,000 | 0.4% |
| $200,000 to $500,000 | 0.6% |
| $500,000 to $1,000,000 | 1.2% |
| $1,000,000 to $5,000,000 | 3.0% |
| $5,000,000 to $10,000,000 | 5.5% |
| $10,000,000 and over | 8.2% |
The overall individual audit rate has declined from over 1% in 2010 to approximately 0.4% in 2024, reflecting reduced IRS staffing and resources. However, audit rates for high-income taxpayers and large corporations have increased in recent years due to targeted enforcement funding from the Inflation Reduction Act.
The IRS also conducts correspondence audits (by mail) for specific issues such as unreported income, incorrect credits, and deduction claims. Field audits (in-person) are more common for higher-income taxpayers and complex returns.
The Tax Gap
The tax gap is the difference between the total amount of tax owed and the amount actually paid on time. The IRS estimates the gross tax gap for tax years 2020-2021 at approximately $688 billion annually, making it one of the largest fiscal challenges facing the US government.
The tax gap is composed of three main components:
- Nonfiling: ~$52 billion (8%) — Taxpayers who do not file required returns or file late
- Underreporting: ~$542 billion (79%) — Taxpayers who report less income or claim improper deductions or credits
- Underpayment: ~$94 billion (13%) — Taxpayers who file on time but do not pay the full amount due
After IRS enforcement actions and late payments, the net tax gap is estimated at approximately $600 billion. The largest single component of the underreporting gap is underreported business income (including self-employment income), which accounts for approximately $150 billion of the gap.
The Inflation Reduction Act of 2022 provided the IRS with approximately $80 billion in additional funding over 10 years, with a significant portion dedicated to enforcement and technology modernization aimed at reducing the tax gap. The IRS has announced plans to increase audit rates for high-income taxpayers and large partnerships while maintaining low audit rates for middle-income taxpayers.
State Tax Data
State tax systems vary widely across the United States. Here are key state tax statistics:
States with no individual income tax: Alaska, Florida, Nevada, New Hampshire (interest and dividends only), South Dakota, Tennessee, Texas, Washington (capital gains tax applies for high earners), and Wyoming.
Highest top state income tax rates (2026): California (13.3%), Hawaii (11%), New York (10.9%), New Jersey (10.75%), Oregon (9.9%), Minnesota (9.85%), and Vermont (8.75%).
Average combined state and local sales tax rates: The national average combined state and local sales tax rate is approximately 8.5%. States with the highest combined rates include Louisiana, Tennessee, and Arkansas (over 9.5%).
State tax revenue composition: States rely on a mix of individual income taxes (approximately 36% of state tax revenue), general sales taxes (31%), corporate income taxes (4%), and excise taxes (12%), with the remainder from other sources including property taxes, license fees, and severance taxes.
For detailed state-by-state information, see our state tax rates page.
Frequently Asked Questions
As a tax content specialist, I verify every statistic in this data hub against the original government publications, including the IRS Statistics of Income annual reports, the IRS Data Book, Congressional Budget Office budget and economic outlook reports, and Tax Policy Center distributional analyses. Tax statistics can vary depending on methodology and timing, so I cross-reference multiple authoritative sources to ensure accuracy. I update this hub annually as new data becomes available following each filing season.
— Lead Tax Content Strategist, TaxCalcHQ