Tax Fraud and Evasion

Tax Fraud and Evasion
Principal statutes	26 U.S.C. §§ 7201 (evasion), 7202, 7203, 7206, 7212(a)
Investigators	IRS Criminal Investigation (IRS-CI)
Prosecution	DOJ Criminal Division Tax Section (since Dec 2025) and U.S. Attorneys
Tax gap (TY2022)	$696 billion gross; $606 billion net
IRS-CI FY2025	$10.59 billion financial crime identified; $4.5 billion tax fraud
Offshore reporting	FBAR (FinCEN 114), Form 8938 (FATCA)

Tax evasion is the willful, illegal attempt to defeat the assessment or payment of tax, as distinct from tax avoidance, the lawful use of the Code to reduce liability. Tax fraud is the broader category of false returns, false documents, schemes to misuse the refund system and employment-tax non-payment. Tax crimes are rarely the lead offense of an investigation in the way that securities fraud is; they are frequently the charge that is easiest to prove, as in the prosecution of Al Capone in 1931. For forensic accountants, the tax return is both a target of fraud and a document that can show unreported income.^[1]

1 Evasion versus avoidance; the statutes

The Internal Revenue Code's principal criminal provisions are:

Section	Offense	Maximum penalty
§ 7201	Attempt to evade or defeat tax (felony)	5 years; $100,000 individuals, $500,000 corporations
§ 7202	Willful failure to collect or pay over tax	5 years; $10,000 fine under the statute (higher under 18 U.S.C. § 3571)
§ 7203	Willful failure to file, pay, keep records (misdemeanor)	1 year
§ 7206(1)	Fraud and false statements under penalty of perjury	3 years
§ 7206(2)	Aiding or assisting false returns (preparers, promoters)	3 years
§ 7212(a)	Corrupt interference with the administration of the Code	3 years
18 U.S.C. § 371	Conspiracy to defraud the United States (Klein conspiracy)	5 years

Evasion requires three elements: a tax deficiency, an affirmative act of evasion or attempt, and willfulness. Spies v. United States (1943) lists affirmative acts such as keeping a double set of books, making false entries, concealing assets, covering up sources of income, and handling affairs to avoid usual records. Willfulness is the “voluntary, intentional violation of a known legal duty” (United States v. Pomponio, 1976), and under Cheek v. United States (1991) a good-faith misunderstanding of the law, even if unreasonable, negates it, though a disagreement with the law's validity does not. Civil fraud under § 6663 imposes a 75% penalty on the underpayment attributable to fraud, and there is no statute of limitations on assessment for a fraudulent return (§ 6501(c)); the criminal limitation period is generally six years (§ 6531).

2 Scale and enforcement landscape

The IRS estimated the gross tax gap for tax year 2022 at $696 billion, of which $539 billion (77%) was underreporting, $94 billion underpayment and $63 billion non-filing; about $90 billion is expected to be paid late, leaving a net gap of $606 billion and a voluntary compliance rate of 85%.^[2] Individual income-tax underreporting is concentrated in business income that has little third-party reporting; wages, which are reported on W-2s, show compliance above 99%, while non-farm proprietor income is under-reported by a large share. This is the intellectual basis for the indirect methods below.

IRS-CI's FY2025 annual report records $10.59 billion in financial crime identified (up 15.7%), of which $4.5 billion was tax fraud (up 111.8% from FY2024), with nearly 64% of investigative time spent on tax crimes, a 25% increase in search warrants and a 14% increase in prosecution referrals; it seized more than $800 million in assets and about 2.35 petabytes of digital data.^[3] Cases are typically developed with analytics and from referrals from IRS civil examination, the IRS Whistleblower Office (§ 7623(b): 15–30% of collected proceeds in cases where tax, penalties and interest exceed $2 million), banks' SARs and other agencies (see Federal Enforcement Agencies and Whistleblowers and the False Claims Act).

The DOJ Tax Division, the historic gatekeeper that had to authorize most criminal tax prosecutions, was eliminated as a standalone component: the proposal appeared in the June 2025 budget, its website was archived in September 2025, dissolution was finalized on 30 November 2025 and the implementing rule took effect on 9 December 2025. Roughly 300 attorneys moved to a Tax Litigation Branch in the Civil Division and about 100 to a Tax Section in the Criminal Division.^[4] Further reorganizations followed in 2026; defense and investigative practitioners should check current authorization procedures.

3 Proof methods: direct and indirect

Specific-items method. Used when the government can identify particular unreported receipts or false deductions: deposits traced to unreported sources, checks from customers not entered in the books, and personal expenses deducted as business costs. It proves the deficiency item by item and is the preferred method where records exist.

Indirect methods are used when books are missing, unreliable, or the taxpayer deals in cash. All rely on the principle that income must equal what the taxpayer applied to expenditures or accumulated, and are upheld in Holland v. United States (1954) (net worth) and United States v. Johnson (1943) (expenditures). The three principal methods are:

1. Net worth plus nondeductible expenditures: compare year-end net worth (assets minus liabilities, at cost) with the prior year, add living expenses and nondeductible outlays, subtract known nontaxable income, and compare to reported income. Foundations require an established opening net worth, a likely source of the income, and negation of reasonable explanations such as cash hoards, loans, gifts and inheritances (Holland).
2. Sources and applications of funds (expenditures method): used when net worth is stable but spending is high. Total expenditures plus increases in assets and decreases in liabilities (applications) minus known sources (decreases in assets, increases in liabilities, nontaxable receipts) equals required income.
3. Bank deposits method: compute total deposits to all accounts; subtract transfers between the taxpayer's accounts, redeposited items, loans, gifts and other nontaxable sources; add cash expenditures paid from undeposited receipts; the result is gross receipts.
4. Markup and percentage methods for retail and service businesses: apply an industry markup to cost of goods sold, or a standard ratio (e.g., tips-to-sales or gallons per vehicle) to estimate sales.

Each method produces a schedule that becomes the core exhibit, supported by summary testimony under Federal Rule of Evidence 1006 and bank, title and third-party records (see Evidence and Testimony). Defense experts attack the opening net worth, undeposited cash and the thoroughness of leads followed. Good practice documents the leads run to ground, the taxpayer's explanations (typically through interview or the tax-return preparer file), and a sensitivity analysis showing the deficiency under a range of assumptions.

4 Worked examples

4.1 Bank deposits method (hypothetical restaurant owner)

Line	Amount ($)
Total deposits, all accounts, year	612,000
Less: transfers between own accounts	(95,000)
Less: loan proceeds (documented bank loan)	(40,000)
Less: redeposited returned check	(2,000)
Add: cash expenditures from undeposited receipts (payroll, produce)	71,000
Gross receipts	546,000
Less: reported gross receipts	(410,000)
Unreported receipts	136,000
Less: additional deductible costs identified in the records (e.g., 30% food cost)	(40,800)
Understated net income	95,200

Tax shown at a hypothetical 24% marginal bracket would be about $22,850 before penalties; the criminal "tax due and owing" threshold in the U.S. Sentencing Guidelines (§ 2T4.1) increases the offense level with the amount of loss (for example, more than $250,000 raises the base level from 16 to 18; more than $550,000 to 20). The examiner confirms each reduction with documents; unsupported subtractions are the most common defense attack.

4.2 Net worth method (hypothetical individual)

Item	Year 0 ($)	Year 1 ($)
Assets at cost (cash, real estate, vehicles, accounts)	300,000	720,000
Liabilities	(180,000)	(310,000)
Net worth	120,000	410,000

Increase in net worth = $290,000. Add non-deductible living expenses of $64,000 = $354,000. Less known nontaxable sources (documented inheritance $50,000, gifts $10,000) = $294,000 of corrected income. If the filed return reported $85,000 in income, the apparent understatement is $209,000, but the government must also dispose of the "cash hoard" defense, that is, show the opening net worth did not omit cash on hand, usually through bank cash-withdrawal histories, safe-deposit records, prior statements to lenders on credit applications, and the absence of prior hoard-like behavior.

5 Offshore accounts: FBAR and FATCA

U.S. persons with a financial interest in or signature authority over foreign financial accounts whose aggregate value exceeds $10,000 at any time in the year must file a Report of Foreign Bank and Financial Accounts (FinCEN Form 114) under the Bank Secrecy Act (31 U.S.C. § 5314), due 15 April with an automatic extension to 15 October. Willful failure carries a civil penalty of the greater of about $100,000 (inflation-adjusted) or 50% of the account balance at the time of the violation, and criminal exposure of up to five years. Separately, the Foreign Account Tax Compliance Act (FATCA, 2010; IRC § 6038D) requires individuals with specified foreign financial assets above thresholds (for single U.S. residents, generally $50,000 at year-end or $75,000 at any time) to attach Form 8938 to the return, and requires foreign financial institutions to report U.S. account holders to the IRS, directly or through intergovernmental agreements. The OECD Common Reporting Standard supplies similar automatic exchange for non-U.S. residents of participating countries, which is useful for tax investigators abroad.

Enforcement history: the 2009 UBS deferred prosecution agreement ($780 million and disclosure of about 4,450 accounts) and the Department of Justice's Swiss Bank Program (2013–2016) broke bank secrecy for U.S. clients. Practical examination procedures include: (1) compare the foreign-account indicators on Schedule B and the return with the FBAR database and Form 8938; (2) review U.S. bank records for wires to or from foreign banks and for checks drawn on foreign institutions; (3) examine credit-card and ATM use abroad, cross-border travel, and foreign property ownership (see Asset Tracing); (4) search for offshore entities in leak data and registries (see Shell Companies and Beneficial Ownership); and (5) for crypto, trace exchange accounts and wallets (see Cryptocurrency Tracing).

6 Employment tax and refund fraud

Employment-tax evasion. Employers withhold income tax and the employee share of FICA from wages, and hold these funds in trust for the government. Failure to remit is a felony under § 7202, and responsible persons face a civil trust fund recovery penalty equal to 100% of the unpaid trust-fund taxes under § 6672. Schemes include pyramiding (filing but not paying, then closing the business and opening a new entity), paying workers off-book in cash, misclassifying employees as independent contractors, and use of professional employer organizations (PEOs) or payroll agents that collect and keep the tax. Detection tests: compare Forms 941 with W-2/W-3 totals and state unemployment wage reports; compare payroll deposits with bank outflows labelled as payroll; compare reported wages with industry ratios (revenue per employee); and check Form 1099-NEC payments to workers who function as employees.

Refund fraud. Typical schemes are stolen-identity refund fraud (filing early in the season with a victim's data and routing the refund to a prepaid card or bank account), inflated withholding credits, false Schedule C and Earned Income Tax Credit claims, fuel-tax-credit abuse, and Employee Retention Credit (ERC) claims for pandemic-era periods, which prompted an IRS moratorium on new claims in September 2023 and a wave of prosecutions of promoters. Data tests include duplicate bank accounts or addresses receiving many refunds, refunds routed to accounts not in the taxpayer's name, W-2 and withholding data that do not match employer filings, return preparers with abnormal refund-per-return profiles, and returns filed from the same device or IP address.

7 Red flags and data tests

• Lifestyle inconsistent with reported income (compare a property, vehicle and tax-return profile against a net-worth estimate).
• Cash-intensive business with margins that differ from industry norms, or with deposits that change after a competitor opens.
• Deposits structured just below $10,000 (see Money Laundering).
• Two sets of books; backdated or missing records; frequent changes of accountants.
• Large, round or unsupported deductions; “consulting” fees to related shells (see Shell Companies and Beneficial Ownership).
• Transfers to nominee entities or foreign accounts, particularly if followed by reacquisition of the asset or loans back (a “round trip”).
• Payroll tax liabilities that grow while the owner draws personal expenses.
• Preparer-specific anomalies: identical deductions across clients, EIC claims for most clients.

Analytics such as Benford's Law on Schedule C line items, ratio analysis, and the techniques in Fraud Detection Analytics identify candidates; they are not evidence of willfulness. Investigators must also respect the limits on use of tax return information (26 U.S.C. § 6103), under which private examiners generally cannot obtain returns without the taxpayer's consent or a court order, and professional standards covered in Forensic Accountant Ethics.

See also: Net Worth Method, Forensic Accounting, Money Laundering, AML Law, Asset Tracing, Whistleblowers and the False Claims Act.

References

1. IRS. Criminal Investigation Annual Report (Publication 3583). irs.gov
2. IRS. "IRS releases 2022 tax gap projections; voluntary compliance rate among taxpayers remains steady." Oct 2024. irs.gov
3. IRS. "IRS-CI issues Fiscal Year 2025 Annual Report showcasing banner investigative results." irs.gov
4. American Bar Association. "Federal Tax Prosecutions: Department of Justice Tax Division Eliminated." americanbar.org
5. Holland v. United States, 348 U.S. 121 (1954); Spies v. United States, 317 U.S. 492 (1943); Cheek v. United States, 498 U.S. 192 (1991).
6. FinCEN. FBAR guidance. fincen.gov