Criminal Investigator (IRS) Job Description

A Criminal Investigator (IRS) is a special agent in IRS Criminal Investigation (IRS-CI), the law enforcement arm of the Internal Revenue Service. The position is classified as criminal investigator in the 1811 job series, and the IRS calls it special agent. A Treasury inspector general audit published in September 2026 describes IRS-CI agents as the only federal law enforcement agents with investigative jurisdiction over violations of the Internal Revenue Code. That jurisdiction is the core of the job, but the caseload reaches well past tax returns into money laundering, public corruption, health care fraud and identity theft.

Cases begin in several ways. A revenue agent in an IRS civil audit spots badges of fraud and makes a referral. A bank files a Suspicious Activity Report that lands in front of a review team. A drug or gang task force needs someone who can trace proceeds and build the forfeiture case. A whistleblower walks in with spreadsheets. From there the agent develops the evidence the old-fashioned way, with grand jury subpoenas for bank and brokerage records, interviews of bookkeepers and tax preparers, surveillance, and search warrants, then rebuilds the subject's finances using indirect methods of proof such as the bank deposits, net worth and expenditures methods.

Tax work takes most of the clock. In its fiscal year 2025 results, IRS-CI said it dedicated nearly 64% of investigative time to tax crimes, often using data analytics to find tax fraud and payroll schemes. The same report says IRS-CI seized 2.35 petabytes of digital data in FY25, a nearly 60% increase from the previous fiscal year. Agents work with computer investigative specialists to image phones and servers, then sort ledgers, chat logs and crypto wallet records into a timeline that a jury can follow.

The end product is a prosecution report. The agent lays out each element of the offense, including willfulness in a tax case, and sends it through IRS-CI review to the Department of Justice and the local U.S. Attorney's Office. After indictment, the agent prepares summary charts and exhibits, sits with the prosecutor at trial and testifies about the investigation and the money trail.

This is armed, operational work. The IRS careers site says agents dedicate a minimum of 50 hours per week, may work irregular hours and remain available for duty at any time, including weekends and holidays, and that the job includes arrests, executing search warrants and other potentially hazardous assignments. Agents must possess and be ready to deploy a firearm as part of their law enforcement duties.

Joint work has a long history. The same inspector general audit says CI has traditionally participated in investigative joint task forces within its jurisdiction, among them drug trafficking, terrorism and financial crimes task forces, where the agent's contribution is the financial case: who paid whom, through which accounts, and what can be seized.

The entry rules are set by the Office of Personnel Management's qualification standard for the 1811 criminal investigator series, which carries a special requirement for IRS special agent positions. A degree in any major qualifies only if it included or was supplemented by at least 15 semester hours in accounting and 9 semester hours from fields such as finance, economics, business law, tax law, or money and banking. The other route is experience: responsible accounting and business work that required knowledge and application of accounting and auditing principles. The rule points accountants from audit, tax and forensic practices toward the job, and it means a criminal justice graduate with no accounting coursework needs those credits, or qualifying accounting and business experience, before applying.

The basic eligibility rules on the IRS careers site are firm. Applicants must hold U.S. citizenship, be at least 21 years of age upon completion of the training academy and no older than 37 years of age at the time of appointment, be legally able to carry a firearm, and hold a valid driver's license. They must clear a background investigation and a pre-employment medical examination. Fitness stays part of the job after hiring: every special agent takes an annual physical fitness test made up of a timed 1.5-mile run, push-ups, sit-ups and a sit-and-reach flexibility test.

Training is long. The IRS says the curriculum spans approximately 6.5 months in three segments at the Federal Law Enforcement Training Center in Glynco, Georgia: a one-day pre-basic orientation, the FLETC-run Criminal Investigator Training Program of approximately 12 weeks, and IRS-CI's own Special Agent Investigative Techniques (SAIT) course of approximately 14 weeks. In SAIT, the IRS says, students learn how to investigate the specific violations of federal law under CI's jurisdiction. Satisfactory completion of SAIT is required to keep the job. A Treasury inspector general evaluation from April 2026 found a lack of senior executive oversight of changes to the SAIT program, such as curriculum and test grading, and made five recommendations, all of which the IRS agreed with.

As a rough guide, applicants who arrive with two to five years in public accounting, corporate audit, bank compliance or another investigative job bring a useful mix, because the first cases demand both document discipline and comfort with interviews.

Credentials that strengthen an application or a later career include the Certified Public Accountant license, issued by state boards of accountancy; the Certified Fraud Examiner (CFE) credential from the Association of Certified Fraud Examiners; and the Certified Anti-Money Laundering Specialist (CAMS) credential from ACAMS. None is required for appointment, but each maps to work agents do.

Useful skills to bring: reading general ledgers and tax returns quickly, building pivot tables and link charts, writing tight memoranda of interview, and speaking calmly in front of a grand jury.

The special agent corps is a countable group. The Treasury Inspector General for Tax Administration (TIGTA) reported that, as of September 2025, CI employed 2,195 special agents. The agency's own FY2025 annual report, released Dec. 11, 2025, describes a workforce of approximately 3,000 employees in total.

Results rose in FY25. In FY25, IRS-CI investigators identified financial crimes totaling $10.59 billion, a 15.7% increase from FY24, and $4.5 billion of that figure came from tax fraud. The agency also reported a 25% increase in search warrants and a 14% increase in prosecution referrals to the Department of Justice over the same period. TIGTA puts IRS-CI's FY2025 conviction rate at 89 percent.

The bigger story of 2025 and 2026 is where agents spent their hours. After a February 7, 2025 request from the Secretary of Homeland Security, IRS-CI special agents were deputized to assist with immigration enforcement, and the agency also supported task forces created for Washington, D.C. and Memphis. TIGTA's September 2026 audit found that from May 2025 through March 2026 CI special agents spent more than 353,000 hours on the three task forces, roughly equivalent to 170 full-time equivalent special agents at a labor cost of approximately $37 million; with $2.9 million in travel, the total cost to CI was approximately $40 million, and DHS did not reimburse the IRS for the immigration work. TIGTA estimated those hours translate to approximately 313 tax-related investigations that could have been started and completed. It also found no notable impact on the number of investigations initiated, and reported that CI's support for most of these activities ended in May 2026.

The task forces changed hiring at the margin as well. TIGTA reported that CI hired 17 special agents at the Administration's request to support the D.C. task force; after training they were assigned to it beginning in July 2026, and they will move to regular CI duties when that task force is completed. TIGTA also made three policy recommendations covering body-worn cameras, masks and documentation of task force work; CI agreed to review its body-worn camera policy and disagreed with the other two.

Money is the constraint to watch. TIGTA reported CI's operating budget at approximately $1 billion for FY 2025 and approximately $895 million for FY 2026.

For candidates who get in, the IRS pay guide describes managerial opportunities that can lead from field agent work to Grade 14 and Grade 15 positions. The same skills fit bank financial intelligence units, forensic accounting firms and corporate investigations. The agency's federal-only mission means the job exists nowhere else under this title, so the selection process, not a rival employer, is the hurdle that matters.

Dear Hiring Official,

I am applying for the Special Agent position with IRS Criminal Investigation. I am a licensed CPA and a senior associate in the forensic accounting group of a regional accounting firm, where I spend my days tracing funds through bank statements, rebuilding books that were never kept properly, and explaining the results to attorneys and, twice, to a judge.

The case that convinced me to apply was a payroll services matter. A client's outside payroll provider had been collecting employment taxes from small businesses and holding back a slice before remitting the rest. I built the reconstruction from bank records and quarterly returns, matched each missing deposit to a client, and wrote a schedule the client's counsel used to settle. The civil case closed. The person responsible kept running a similar business under a new name. I want to work on the side of these cases that can put an end to that.

My accounting background gives me the habits the job demands: I document every source, I reconcile before I conclude, and I can walk a non-accountant through a bank deposits analysis without losing them. I have also learned to interview people who would rather not talk, including a controller who changed his story three times over two meetings.

I am comfortable with the physical and operational side of the role. I train for distance running, I have no limits on relocation, and I understand that the job means long weeks, call-outs and a firearm.

Thank you for considering my application. I would welcome the chance to discuss how I can contribute to your field office.

Sincerely, [Your Name], CPA