IRS Publication 5869 – The IRS tax gap represents the difference between the total taxes owed to the U.S. government and the amount actually paid on time. This metric is crucial for understanding tax compliance levels and informing policy decisions. IRS Publication 5869, titled “Federal Tax Compliance Research: Tax Gap Projections,” provides detailed projections and insights into this gap. Released in October 2024, it focuses on tax year (TY) 2022 while revising estimates for prior years. In this article, we’ll explore the key findings, components, methodology, and implications of these projections to help taxpayers, policymakers, and researchers grasp the state of federal tax compliance.
What Is the Tax Gap and Why Does It Matter?
The tax gap is a measure of overall noncompliance with the Internal Revenue Code. It includes three main components: nonfiling (taxes not paid by those who fail to file returns on time), underreporting (taxes understated on timely filed returns), and underpayment (taxes reported but not paid on time). The gross tax gap is the total true tax liability minus what is paid voluntarily and timely, while the net tax gap subtracts late payments and enforcement collections from the gross figure.
Understanding the tax gap is essential because it highlights areas where compliance is low, such as income with limited reporting visibility. For TY 2022, the projected gross tax gap stands at $696 billion, with a net tax gap of $606 billion after accounting for $90 billion in enforced and late payments. This translates to a voluntary compliance rate (VCR) of 85.0%, meaning about 85% of taxes are paid on time without enforcement—a rate that has remained stable over recent years.
The tax gap’s growth often mirrors economic expansion. For instance, the $696 billion figure for TY 2022 is a $200 billion increase from the 2014-2016 average, aligning with a 41% rise in GDP over that period. However, it represents a slight decrease from the revised TY 2021 gross gap of $708 billion, primarily due to lower capital gains realizations.
Key Projections from IRS Publication 5869
Publication 5869 offers projections for TY 2022 and revisions for earlier years, based on updated data and methodologies. Here’s a breakdown of the main figures:
| Tax Year | Gross Tax Gap | Net Tax Gap | Voluntary Compliance Rate (VCR) | Net Compliance Rate (NCR) | Enforced & Late Payments | Total True Tax Liability |
|---|---|---|---|---|---|---|
| TY 2022 | $696 billion | $606 billion | 85.0% | 86.9% | $90 billion | $4,635 billion |
| TY 2021 (Revised) | $708 billion | $617 billion | 84.9% | 86.8% | $90 billion | $4,673 billion |
| TY 2020 (Revised) | $581 billion | $501 billion | 85.0% | 87.1% | $80 billion | $3,883 billion |
| TY 2017-2019 (Avg.) | $549 billion | $480 billion | 84.9% | 86.8% | $70 billion | $3,644 billion |
| TY 2014-2016 (Avg.) | $496 billion | $428 billion | 85.0% | 87.0% | $68 billion | $3,307 billion |
These projections assume compliance behavior remains consistent with historical data, such as TY 2014-2016 for underreporting. Revisions for TY 2021 included an $11 billion increase in underreporting (mainly from corporation income taxes) and a $29 billion rise in underpayments, offset by improved nonfiling estimates.
Breaking Down the Components of the Tax Gap
The tax gap is segmented into nonfiling, underreporting, and underpayment, each contributing differently to the overall figure for TY 2022:
- Nonfiling Tax Gap ($63 billion, 9% of gross): This arises from taxes owed on untimely filed returns. Individual income taxes account for $53 billion, self-employment taxes for $9 billion, and estate taxes for $1 billion.
- Underreporting Tax Gap ($539 billion, 77% of gross): The largest component, stemming from understated taxes on filed returns. Key breakdowns include:
- Individual income tax: $381 billion (55% of gross).
- Corporation income tax: $44 billion (6%).
- Employment tax: $111 billion (16%). Compliance varies by income visibility: Sources with substantial withholding (e.g., wages) have only 1% misreporting, while low-visibility income like nonfarm proprietor earnings sees 55% misreporting.
- Underpayment Tax Gap ($94 billion, 14% of gross): Taxes reported but not paid on time, with individual income taxes making up $80 billion.
By type of tax, individual income taxes dominate the net gap at $447 billion, followed by employment taxes at $119 billion.
Methodology Behind the Tax Gap Projections
The IRS uses a combination of audit data, statistical modeling, and administrative records to project the tax gap. Underreporting estimates rely on Detection Controlled Estimation (DCE) to account for undetected noncompliance, drawing from TY 2014-2016 audits. Nonfiling and underpayment use more current IRS data.
Projections grow with economic indicators like reported tax liabilities but do not predict behavioral changes. Limitations include data gaps for corporations, foreign activities, digital assets, and pandemic-related credits. The IRS updates these annually, with full methodology detailed in Publication 6031.
As of early 2026, the TY 2022 projections remain the most recent, with new estimates delayed until fall 2025.
Implications for Taxpayers and Policy
The stable VCR of around 85% indicates consistent compliance, but the growing absolute gap underscores the need for better enforcement and education. Increased IRS funding from the Inflation Reduction Act (2022) could reduce future gaps through enhanced audits and services, though these effects are not yet reflected in projections.
For taxpayers, focusing on accurate reporting—especially for low-visibility income—can help avoid penalties. Policymakers may prioritize information reporting expansions to boost compliance in high-gap areas.
In summary, IRS Publication 5869 sheds light on the persistent challenges in federal tax compliance. By addressing the tax gap’s root causes, the U.S. can improve revenue collection and fairness in the tax system. For the full document, download it from the IRS website.