IRS Publication 1415 – IRS Forms, Instructions, Pubs 2026 – The IRS Publication 1415 (Rev. 10-2022), titled Federal Tax Compliance Research: Tax Gap Estimates for Tax Years 2014–2016, is the official IRS report detailing the nation’s tax noncompliance. Tax professionals, policymakers, and taxpayers searching for accurate data on the IRS tax gap, voluntary compliance rate, and federal tax compliance research consistently turn to this key document.
Published in August/October 2022, Publication 1415 provides the most detailed comprehensive estimates available for the mid-2010s period, along with projections through 2017–2019 and revisions to earlier years. It remains a foundational resource even as the IRS releases updated projections (such as the $696 billion gross tax gap projection for tax year 2022).
Download the full PDF here: IRS Publication 1415 PDF.
What Is the Tax Gap? IRS Definitions and Why It Matters
The tax gap measures the difference between the true tax liability owed under the Internal Revenue Code and the amount paid voluntarily and on time.
- Gross tax gap: Total unpaid tax before any late payments or IRS enforcement.
- Net tax gap: Gross tax gap minus amounts eventually collected through late voluntary payments and IRS enforcement actions.
The IRS breaks noncompliance into three main components:
- Nonfiling gap — Tax owed by people or entities who never file a required return.
- Underreporting gap — Tax owed on filed returns but understated (the largest component).
- Underpayment gap — Tax reported on timely filed returns but not paid on time.
These estimates help the IRS allocate resources for enforcement, improve taxpayer services, and design compliance programs. A stable voluntary compliance rate around 85% shows most Americans pay what they owe, but the absolute dollar amount grows with the economy.
Key Findings in IRS Publication 1415 (Tax Years 2014–2016)
Publication 1415 estimates an average annual gross tax gap of $496 billion for tax years 2014–2016.
After accounting for approximately $68 billion in late payments and enforced collections, the net tax gap stands at $428 billion per year.
Voluntary Compliance Rate (VCR): 85.0% (taxes paid voluntarily and on time).
Net Compliance Rate (NCR): Approximately 87.0% (after enforcement and late payments).
This represents a slight improvement from the revised 83.7% VCR for tax years 2011–2013. The increase in the dollar gap ($496B vs. previous $438B revised) largely reflects 23% economic growth and higher true tax liability, not declining compliance behavior.
Breakdown by Component (Annual Average, TY 2014–2016)
- Underreporting: $398 billion (80% of gross gap) — the dominant source.
- Underpayment: $59 billion (12%).
- Nonfiling: $39 billion (8%).
Breakdown by Major Tax Type (Gross Tax Gap)
- Individual income tax: $357 billion (72% of total).
- Employment tax (including self-employment and payroll taxes): $141 billion.
- Corporation income tax: $37 billion.
- Estate, gift, and excise taxes: Minimal (under $1 billion combined).
Individual income tax underreporting alone accounts for the majority, with business income (especially nonfarm proprietor income and partnerships/S-corps) showing higher noncompliance due to lower information reporting.
Information reporting dramatically improves compliance:
- Income with substantial withholding and reporting: ~1% misreporting rate.
- Income with reporting but no withholding: ~6%.
- Income with little or no reporting: ~55%.
Projections in Publication 1415 for Tax Years 2017–2019
The report also includes forward-looking projections assuming stable compliance behavior scaled to growing reported tax liabilities:
- Projected gross tax gap: $540 billion per year.
- Projected voluntary compliance rate: 85.1%.
- Projected net tax gap: $470 billion (after ~$70 billion in late/enforced collections).
Underreporting was projected to drive most of the increase.
Methodology: How the IRS Produces Reliable Tax Gap Estimates
Publication 1415 uses rigorous, data-driven methods developed over decades:
- National Research Program (NRP) random audits with Detection Controlled Estimation (DCE) to account for undetected noncompliance.
- Hybrid approaches combining Census data, administrative records, and operational audits for nonfiling.
- Econometric models and biased-sample adjustments for corporate underreporting.
- Direct tabulations from IRS systems for underpayment and late payments.
Estimates pool three tax years for statistical reliability and explicitly note limitations (e.g., no standard errors published, exclusion of illegal-source income, emerging issues like digital assets at the time). The IRS continues refining methods for newer areas.
Comparison to Earlier and Later Estimates
Publication 1415 revised the 2011–2013 gross tax gap upward to $438 billion (from prior $441 billion preliminary) while showing stable compliance.
For context on trends (data from IRS and analyses):
Voluntary compliance has remained remarkably steady around 83–85% for two decades despite economic changes and tax law reforms (e.g., PATH Act, TCJA). Newer IRS projections (Publication 5869, October 2024) for tax year 2022 show a gross tax gap of $696 billion and the same 85.0% voluntary compliance rate — consistent with Publication 1415 patterns but scaled to a larger economy (GDP grew ~41% from the 2014–2016 period).
Latest 2022 projections (Publication 5869):
- Nonfiling: $63 billion
- Underreporting: $539 billion
- Underpayment: $94 billion
- Individual income tax: $514 billion of the total gross gap
Why Publication 1415 Remains Essential Reading?
Even with newer projections available on the IRS Tax Gap page, Publication 1415 offers the deepest methodological transparency and detailed breakdowns for the 2014–2016 era. It directly informed IRS compliance strategies, resource allocation under the Inflation Reduction Act funding, and Congressional oversight.
Understanding the tax gap promotes:
- Fairness — Honest taxpayers aren’t subsidizing noncompliance.
- Revenue estimation — Accurate budgeting for government programs.
- Policy design — Targeting enforcement where it yields the highest return (e.g., high-income nonfilers, complex business income).
The IRS uses these insights in its Comprehensive Strategy for Reducing the Tax Gap, balancing enforcement with taxpayer service improvements.
Frequently Asked Questions About IRS Publication 1415 and the Tax Gap
- Is Publication 1415 the most current tax gap report?
No — it covers 2014–2016 with 2017–2019 projections. The IRS now releases updated projections (latest for TY 2022 in Publication 5869). Full new estimates are expected in coming years per the IRS release schedule. - What is the current IRS tax gap estimate?
For tax year 2022 projections: $696 billion gross, 85.0% voluntary compliance rate (same rate as Publication 1415). - Who should read Publication 1415?
Tax professionals preparing complex returns, policymakers, researchers, journalists, and anyone interested in federal tax administration transparency. - Does the tax gap include illegal income?
No. Official estimates exclude income from illegal activities due to measurement challenges. - How can the tax gap be reduced?
Through better information reporting, simplified filing, enhanced IRS service, targeted enforcement on high-risk areas, and legislative changes (e.g., expanded third-party reporting).
Where can I download IRS Publication 1415?
Directly from the IRS: https://www.irs.gov/pub/irs-pdf/p1415.pdf.
Stay Informed on Federal Tax Compliance Research
The IRS periodically updates tax gap data on its dedicated statistics page. For the full methodology behind the 2014–2016 estimates, read Publication 1415 alongside the companion executive summary (Publication 5364) and tax gap map.
By understanding these official numbers, taxpayers and professionals gain valuable perspective on compliance trends and the IRS’s data-driven approach to closing the gap while protecting taxpayer rights.
Last updated with IRS data as of February 2026. All figures are annual averages or as stated in official IRS publications. Always consult the latest IRS documents or a qualified tax professional for your specific situation.