A sprawling construction-payroll case shows how shell companies, cash wages and false workers’ compensation records can create criminal exposure—and what employers should do to stay compliant.
A federal payroll-fraud prosecution involving approximately $89 million in construction checks ended with an eight-year prison sentence for Mario Lisandro Flores Moradel. The case offers employers a stark reminder: paying labor in cash does not eliminate payroll-tax, reporting or insurance obligations.
According to federal authorities, Flores and other participants used shell companies to convert subcontractor checks into cash between 2015 and 2022. Contractors could then pay workers outside ordinary payroll systems, while false records concealed wages from tax agencies and workers’ compensation insurers.
Why this matters
Off-books payroll is not merely a bookkeeping shortcut. When a structure is designed to conceal wages or taxes, it can lead to conspiracy, tax, money-transmission and insurance-fraud exposure—along with restitution, forfeiture and incarceration.
How the alleged pipeline worked
The network created dozens of shell businesses that offered check-cashing and cash-delivery services to construction subcontractors. Those entities cashed roughly $89 million in checks for a fee. The resulting cash was used to compensate workers without normal withholding or wage reporting, producing a reported tax loss of more than $38 million across the scheme.
The arrangement also reached workers’ compensation coverage. Authorities said participants understated payroll and worker counts to obtain lower premiums, then supplied contractors with certificates purporting to show coverage. Together, the payroll and insurance practices gave participating businesses an improper cost advantage over compliant employers.
$89M approximate value of checks cashed · $38M+ reported tax loss across the scheme · 96 months imposed on Flores
| Component | Reported conduct | Compliance risk |
|---|---|---|
| Cash payroll | Subcontractor checks were converted to cash used to pay labor off the books. | Unpaid withholding and employment taxes; false wage reporting. |
| Shell entities | Multiple companies moved funds and obscured the true payroll activity. | Conspiracy and unlicensed money-transmission exposure. |
| Insurance records | Worker and payroll figures were understated and certificates supplied to contractors. | Insurance fraud, contract defaults and uncovered workplace claims. |
From operation to sentencing
- 2015–2022: The shell-company and cash-payroll network operates.
- May 22, 2025: Michael Mayorga and Francisco Alvarez plead guilty to conspiracy charges.
- October 9, 2025: Iris Villafranca and Osman Zapata plead guilty.
- March 23, 2026: Flores pleads guilty to conspiring to defraud the United States and operating an unlicensed money-transmitting business.
- April 14, 2026: Villafranca and Zapata receive prison sentences.
- June 24, 2026: Flores is sentenced to 96 months in federal prison.
Charges and penalties
Flores’s convictions involved conspiracy to defraud the United States under 18 U.S.C. §371 and operating an unlicensed money-transmitting business under 18 U.S.C. §1960. He admitted responsibility for approximately $9.4 million of the tax loss attributed to the broader operation.
The consequences extended across the group. Villafranca received 204 months in prison and substantial restitution and forfeiture orders; Zapata received 51 months and restitution; and Alvarez received probation and restitution. Each defendant’s judgment and financial obligations are individual, so headline totals should not be treated as interchangeable.
Enforcement message
IRS Criminal Investigation and its partner agencies emphasized that investigators can trace funds through cash couriers, shell companies and nominal subcontracting arrangements. A fragmented payment trail is not necessarily an invisible one.
What employers should learn
Cash wages are not inherently unlawful, but employers still must classify workers correctly, calculate and deposit applicable employment taxes, issue accurate information returns and maintain supporting records. A third-party labor provider does not automatically shift those duties away from the business receiving the labor.
Employment authorization and workers’ compensation require their own controls. Employers should complete Form I-9 procedures, use E-Verify where required or elected, confirm coverage directly with authorized insurers, and reconcile insured payroll with tax and accounting records. A certificate alone should not substitute for verification.
A practical payroll-compliance checklist
- Reconcile every pay cycle. Match gross wages, withholding, bank activity, general-ledger entries and payroll returns.
- Vet labor vendors. Confirm legal names, tax IDs, licensing, insurance and who controls and pays each worker.
- Document worker classification. Analyze the actual working relationship rather than relying on a contract label.
- Verify work authorization. Complete and retain Forms I-9 and follow applicable E-Verify rules.
- Confirm insurance independently. Validate policies with the carrier and compare declared payroll with payroll records.
- Escalate unusual cash requests. Treat check-cashing, cash couriers, rotating shell vendors and split invoices as warning signs.
- Correct errors promptly. Ask qualified payroll and tax advisers about amended returns, deposits and available correction procedures before an examination begins.
The broader lesson is straightforward: transparent payroll systems protect workers, taxpayers and honest competitors. Businesses that discover irregularities should preserve records, stop questionable payments and obtain advice tailored to the facts rather than attempting an informal cleanup.




