Introduction – What is Publication 5870?
IRS Publication 5870, officially titled “Federal Tax Compliance Research: Tax Gap Projections Maps,” is one of the most revealing statistical documents published by the Internal Revenue Service. Developed by the IRS Research, Applied Analytics & Statistics (RAAS) division, this publication visually maps out the federal tax gap. Following IRS research reviews and administrative benchmark updates published through April 14, 2026, and September 14, 2026, Publication 5870 remains the federal benchmark illustrating how hundreds of billions of dollars in unpaid taxes slip through the cracks each year.
In simple terms, the “tax gap” is the difference between what taxpayers owe the federal government and what the government actually collects voluntarily and on time. Unlike ordinary IRS publications that teach you how to file forms or claim deductions, Publication 5870 presents an infographic-style diagram showing where compliance breaks down across the entire U.S. economy.
According to current projections detailed in the publication’s framework, the estimated total true tax liability exceeds $4.63 trillion annually. Out of that staggering sum, over $3.93 trillion is collected voluntarily and promptly, leaving a massive projected gross tax gap of nearly $696 billion.
Who Should Read This Publication
While Publication 5870 is widely read by tax economists, legislators, and policy analysts, it holds equal value for ordinary citizens and small business owners. Anyone who wants to understand why the IRS conducts audits, updates compliance programs, and targets specific industries will find answers here.
Tax professionals, CPAs, and enrolled agents frequently study this publication to keep abreast of IRS enforcement priorities. Similarly, students of public finance and business owners can use it to see which types of income face the highest scrutiny from federal auditors.
Key Topics Covered
Publication 5870 organizes the massive United States tax landscape into easy-to-follow visual pathways. The major topics highlighted across the map include:
- Total True Tax Liability: The overall amount of tax legally owed across individual, corporate, employment, and estate tax categories.
- Voluntary Compliance Rate (VCR): The percentage of taxes paid voluntarily and on schedule, which currently hovers around 85 percent.
- Gross Tax Gap: The total amount of tax liability that is not paid on time, broken down into three distinct operational categories.
- Enforced and Late Payments: The tax amounts recovered through administrative measures, IRS automated notices, installment plans, and audits.
- Net Tax Gap: The ultimate amount of revenue that remains uncollected after all compliance and enforcement efforts are exhausted.
Detailed Breakdown of Main Concepts
To interpret Publication 5870, it helps to understand the three primary components that constitute the gross tax gap. The IRS splits noncompliance into three separate buckets:
1. Nonfiling Gap
The nonfiling gap represents taxes left unpaid by individuals and businesses that fail to file their required returns on time or never file at all. In the projected data, nonfiling accounts for approximately $63 billion of the total tax shortfall.
2. Underreporting Gap
By far the largest contributor to the tax gap, underreporting accounts for roughly $539 billion. This occurs when taxpayers file their returns on time but report less income than they earned, overstate deductions, or claim credits for which they are ineligible.
3. Underpayment Gap
The underpayment gap represents taxes that taxpayers accurately calculated and declared on their returns, but simply did not pay by the deadline. This component accounts for around $94 billion of the unpaid total.
| Tax Gap Metric | Projected Amount | Percentage Share / Rate |
|---|---|---|
| Estimated Total True Tax Liability | $4,635 Billion | 100.0% |
| Taxes Paid Voluntarily & Timely | $3,939 Billion | 85.0% (Voluntary Compliance Rate) |
| Gross Tax Gap | $696 Billion | 15.0% of Total True Tax |
| Enforced & Late Collections | $90 Billion | Enforcement Recovery |
| Net Tax Gap (Uncollected Balance) | $606 Billion | 86.9% (Net Compliance Rate) |
Practical Examples or Scenarios
Understanding these macro-level figures becomes much easier when you see how individual taxpayer decisions feed directly into the map in Publication 5870.
Consider the case of Marcus, an independent handyman who receives cash payments for home repair services. If Marcus earns $60,000 in gross receipts but reports only $35,000 on his tax return, his omitted $25,000 contributes directly to the individual underreporting gap.
In another scenario, Sarah runs a successful graphic design business and files her return promptly on April 15. Her return shows that she owes $8,000 in federal taxes, but cash flow problems prevent her from sending a payment. Sarah has not underreported her earnings, but her balance becomes part of the underpayment gap until paid.
How This Publication Relates to Specific Forms
Every dollar tracked on the Publication 5870 diagram ties back to specific tax filings submitted by taxpayers:
- Form 1040 and Schedule C: Individual business income, sole proprietorships, and gig economy earnings generate the single largest share of the underreporting gap.
- Form 1120: Corporate income tax returns contribute approximately $44 billion to $50 billion to the corporate tax gap, separated between small and large corporations.
- Form 941: The Employer’s Quarterly Federal Tax Return accounts for the employment tax gap, which covers underreported payroll and self-employment taxes.
- Form 706: The Estate and Generation-Skipping Transfer Tax Return accounts for approximately $5 billion of the gross shortfall.
Common Misunderstandings Clarified
Many taxpayers mistake Publication 5870 for a regular instruction manual or a guide to avoiding audits. In reality, it does not provide tax advice, deduction lists, or procedural filing rules. It is purely a visual research report reflecting government analytics.
Another common misconception is that the entire tax gap stems from illegal criminal activity or deliberate tax evasion. The research clearly indicates that a large portion of the gap results from complex tax rules, honest computational errors, bookkeeping lapses, and temporary financial insolvency.
Finally, some assume that the gross tax gap is permanent money lost to the nation. Publication 5870 demonstrates that administrative collection notices, payment arrangements, and IRS audit activities successfully recover roughly $90 billion of the missing revenue each cycle.
Why This Publication Matters for Taxpayers
Publication 5870 is much more than dry statistics; it directly influences tax policy and enforcement. When Congress deliberates IRS funding and technology modernization, lawmakers point to this publication to see where additional resources are required.
For everyday taxpayers, Publication 5870 explains IRS behavior. When the IRS increases automated document-matching between third-party 1099 forms and individual returns, it does so specifically to target the massive underreporting figures outlined in this map.
Frequently Asked Questions
Is IRS Publication 5870 updated every year?
The IRS publishes periodic updates and projections rather than annual line-by-line revisions. Detailed statistical studies take several years to assemble due to the time needed to audit sample returns, meaning projections remain the active guidance for extended periods.
What is the difference between the gross tax gap and the net tax gap?
The gross tax gap is the initial total of all taxes not paid voluntarily and on time. The net tax gap is the residual amount left unpaid after the IRS collects late payments and carries out enforcement actions.
Which type of tax has the highest compliance rate?
Taxes subject to substantial third-party reporting and direct wage withholding, such as standard W-2 wage income, consistently demonstrate compliance rates higher than 95 percent. Income sources lacking automated reporting, such as informal cash income, exhibit significantly lower compliance rates.
Conclusion
IRS Publication 5870 offers an indispensable macro-level view of the American revenue collection system. By mapping the pathways of nonfiling, underreporting, and underpayment, the publication sheds light on how voluntary compliance sustains government operations.
Understanding this visual map allows taxpayers and advisors to appreciate the reasoning behind IRS scrutiny, reporting requirements, and compliance checks. Keeping precise financial records and filing on time remain the most reliable ways to stay on the compliant side of the national balance sheet.
