The American system of taxation is based on the premise that all income is taxable (which includes illegally earned income). In many instances, proving that a taxpayer willfully attempted to hide income from the Federal Government is an integral part of proving other criminal activity including fraud, money laundering or Bank Secrecy Act violations. Criminal Investigation continues to fulfill the important role of helping to ensure the integrity and fairness of our nations' tax system.
The Internal Revenue Service Criminal Investigation Division conducts criminal investigations regarding alleged violations of the Internal Revenue Code, the Bank Secrecy Act and various money laundering statutes. The findings of these investigations are referred to the Department of Justice for recommended prosecution.
To learn more about careers in Law Enforcement, please visit the Criminal Investigation Special Agent page.
In addition to the Special Agent, Criminal Investigation careers also include Administrative, Investigatory, Information Technology (IT), and Forensic positions. To learn more about these careers, click here.
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Many people earn extra money from hobbies they enjoy. But when does a hobby become a business? Learn what the #IRS says to consider when determining whether an activity is a hobby or business for tax purposes: https://t.co/gDNitZjjJo #Smallbiz pic.twitter.com/gyUcM57VY9
— IRS Small Biz (@IRSsmallbiz) June 12, 2026
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— IRSnews (@IRSnews) June 12, 2026
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— IRStaxsecurity (@IRStaxsecurity) June 11, 2026