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Individual Tax Return
Instructions for Form 1040
Request for Taxpayer Identification Number (TIN) and Certification
Request for Transcript of Tax Return


Employee's Withholding Allowance Certificate
Employer's Quarterly Federal Tax Return
Employers engaged in a trade or business who pay compensation
Installment Agreement Request

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Rules Governing Practice before IRS

Enforcement: Information Reporting & Verification

Section 3 of the IRS Data Book presents data on information reporting and verification, which, in addition to examinations, are critical tools for identifying and resolving taxpayer errors. In addition to receiving information on self-reported income and tax on returns filed by taxpayers, the IRS gathers independent information about income received and taxes withheld from information returns, such as Forms W–2 and 1099 filed by employers and other third parties. With its Automated Underreporter Program, the IRS matches these information returns to tax returns and contacts taxpayers to resolve discrepancies. In the Automated Substitute for Return Program, the IRS uses information returns from third parties to identify nonfilers; construct tax returns for certain nonfilers based on that third-party information; and assess tax, interest, and penalties based on the substitute returns. To further verify the accuracy of reported information, the IRS also checks for mathematical and clerical errors before refunds are paid.


View details (XLS). For additional graphs from this section, download the PDF of this year’s Data Book.

Highlights of the Data


  • In Fiscal Year (FY) 2017, the IRS received almost 3.6 billion third party information returns; 90.0 percent were filed electronically (Table 14).
  • The IRS closed almost 3.3 million cases under the Automated Underreporter Program, resulting in nearly $6.7 billion in additional assessments (Table 14).
  • For Tax Year 2016 individual income tax returns processed during FY 2017, IRS sent more than 2.0 million notices to taxpayers for about 2.5 million math errors identified on their returns (Table 15).


Enforcement: Information Reporting and Verification: Tables 14 & 15

Table 14: Information Reporting Program, Fiscal Year 2017 (XLS)

Table 15: Math Errors on Individual Income Tax Returns, by Type of Error, Fiscal Year 2017 (XLS)


Prior-Year Data

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