IRS Publication 5783 – The IRS underpayment tax gap represents a critical aspect of tax compliance in the United States, highlighting the difference between taxes reported on timely filed returns and those actually paid on time. Released in October 2022, IRS Publication 5783 provides an in-depth analysis of this gap for tax years 2014-2016, offering valuable insights for taxpayers, policymakers, and financial professionals. This article explores the key findings, methodology, and implications of the underpayment tax gap, drawing from official IRS data to help you better understand tax payment trends and compliance rates.
What Is the Underpayment Tax Gap?
The underpayment tax gap, often referred to as the gross underpayment tax gap, is defined as the amount of tax that taxpayers report on their timely filed returns but fail to pay by the due date. This differs from the broader tax gap, which includes unreported taxes and non-filing. According to IRS Publication 5783, the underpayment gap focuses solely on reported liabilities that go unpaid initially, though much of it is often collected later through enforcement or voluntary payments.
Key metrics in the publication include:
- Voluntary Payment Compliance Rate (VPCR): The percentage of reported tax paid on time.
- Payment Noncompliance Rate: Essentially 100% minus the VPCR.
- Cumulative Payment Compliance Rate (CPCR): The percentage of reported tax paid within a specific period after the due date.
These measures underscore that while most taxpayers who report their taxes pay them promptly, a small but significant portion contributes to the gap. For context, the underpayment gap typically accounts for less than 2% of taxes reported on timely returns, with about two-thirds recovered within three years.
Key Findings from Tax Years 2014-2016
For tax years 2014-2016, the average annual gross underpayment tax gap was $56 billion, representing approximately 1.73% of total IRS collections during the corresponding fiscal years. This figure marks a slight increase from the $50 billion average for 2011-2013, where it comprised about 11% of the overall gross tax gap.
The Voluntary Payment Compliance Rate (VPCR) averaged 98.1% across these years, indicating high overall compliance among those who file and report taxes accurately. The payment noncompliance rate stood at 1.9%, with individual income tax showing the highest rate at 3.2%.
| Tax Year | Gross Underpayment Gap ($ Billion) | Voluntary Payment Compliance Rate (%) |
|---|---|---|
| 2014 | 58.7 | 98.0 |
| 2015 | 57.7 | 98.1 |
| 2016 | 54.4 | 98.2 |
This table illustrates the stability of the gap and compliance rates during the period, with a minor downward trend in the gap by 2016.
Methodology Behind the Estimates
IRS Publication 5783 relies on data from IRS systems, such as the Master File, to tabulate the underpayment gap without heavy estimation for most taxes. Key adjustments include:
- Employer Underdeposits of Withheld Income Tax: Withheld income taxes are reclassified from employment tax to individual income tax. This accounts for amounts not deposited on time by employers, which are treated as part of individual underpayments.
- Self-Employment Tax Allocation: Self-employment taxes reported on Form 1040 are separated from individual income tax and reallocated to employment tax proportionally.
- Tax Types Covered: The analysis includes individual income tax (Form 1040), corporation income tax (Form 1120), employment tax (various Forms like 941), excise taxes (e.g., Form 720), and other taxes (e.g., estate and gift taxes).
Data sources encompass employment tax forms and other filings, ensuring accuracy. One limitation is that the estimates do not include income tax withheld by employers but never remitted to the IRS, as these are not fully tabulated.
Breakdown by Type of Tax
The underpayment gap is dominated by individual income tax, which accounted for 83.2% of the total ($46.8 billion annually on average). Other components include:
- Corporation Income Tax: $4.3 billion (7.7%)
- Employment Tax: $2.7 billion (4.8%)
- Excise Taxes: $0.1 billion (0.2%)
- Other (Mostly Estate & Gift Taxes): $1.1 billion (1.9%)
| Type of Tax | Average Annual Gap ($ Billion) | Share (%) | Noncompliance Rate (%) |
|---|---|---|---|
| Individual Income Tax | 46.8 | 83.2 | 3.2 |
| Corporation Income Tax | 4.3 | 7.7 | 1.4 |
| Employment Tax | 2.7 | 4.8 | 0.3 |
| Excise Taxes | 0.1 | 0.2 | 0.2 |
| Other | 1.1 | 1.9 | 4.0 |
| Total | 56.0 | 100 | 1.9 |
This breakdown reveals that individual taxpayers, particularly sole proprietors, drive much of the growth in the gap due to increasing numbers and payment challenges.
Historical Trends and Comparisons
Comparing to earlier years, the underpayment gap grew from $29.3 billion in 2003 to $58.7 billion in 2014, stabilizing around $54-58 billion by 2016. The VPCR has remained consistently high, between 98.0% and 98.2% from 2011-2016.
In the broader tax gap context, the underpayment component for 2014-2016 was estimated at $59 billion, up $7 billion from the revised 2011-2013 figure. Projections for later years, such as 2022, show the underpayment gap at $94 billion, or 14% of the gross tax gap, still largely from individual income taxes.
Implications for Taxpayers and Policy
The findings in IRS Publication 5783 emphasize the importance of timely payments to avoid penalties and interest. For individuals, especially self-employed filers, tools like estimated tax payments can help mitigate underpayment risks. Policymakers may use this data to address compliance challenges, such as those faced by sole proprietors, potentially through simplified reporting or enhanced education.
While the gap is small relative to total collections, closing it could generate significant revenue. The IRS notes that high VPCR reflects strong voluntary compliance, but ongoing monitoring is essential as economic factors evolve.
Conclusion
IRS Publication 5783 sheds light on the underpayment tax gap for 2014-2016, revealing a manageable but persistent issue in U.S. tax compliance. With an average annual gap of $56 billion and a VPCR exceeding 98%, the data highlights the effectiveness of the tax system while pointing to areas for improvement. Taxpayers should prioritize timely payments, and staying informed through official IRS resources can help maintain compliance. For the full details, refer to the official publication on IRS.gov.