Information For...

For you and your family
Standard mileage and other information

Forms and Instructions

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

Popular For Tax Pros

Amend/Fix Return
Apply for Power of Attorney
Apply for an ITIN
Rules Governing Practice before IRS

Non-filer Investigations - Criminal Investigation (CI)


Taxpayers who fail to file income tax returns and pay taxes pose a serious threat to tax administration and the American economy.

Who Must File
All citizens must comply with the requirements of the tax law to file returns and pay taxes.

Facts & Fiction of Frivolous Arguments
The 16th Amendment was ratified on February 3, 1913 giving Congress the power "to lay and collect taxes."

How Do You Report Suspected Tax Fraud Activity?
If you have information about an individual or company you suspect is not complying with the tax law, report this activity.

Statistical Data
Enforcement statistics on investigations initiated, prosecutions recommended, indictments, sentenced investigations and months to serve in prison.

Examples of Non-filer Investigations
Examples are written from public record documents filed in the district courts where the case was prosecuted.


Criminal Enforcement Home Page

How to Report Suspected Tax Fraud Activities