BOSTON — A Dunstable man and former manager of a Lowell temporary employment agency has been arrested and charged in connection with an alleged scheme to underreport millions of dollars in business income to the Internal Revenue Service.
Siharath Panyanouvong, 56, was indicted by a federal grand jury on one count of aiding and assisting in the preparation and filing of a false tax return. According to the U.S. Attorney’s Office for the District of Massachusetts, Panyanouvong was arrested on Thursday, March 12, 2026, and released on conditions following an initial appearance in federal court in Boston.
According to charging documents, Panyanouvong managed Viscosity Inc., a temporary employment agency in Lowell. Prosecutors allege that between 2017 and 2019 he deliberately failed to report more than $3.5 million in the company’s gross receipts to the Internal Revenue Service.
As a result, the U.S. Attorney’s Office for the District of Massachusetts says Panyanouvong avoided paying more than $980,000 in federal income taxes.
The indictment further alleges that Panyanouvong, who sometimes used the alias “Mike Pan,” cashed more than $4.5 million in customer checks. Prosecutors claim a substantial portion of that cash was used to pay himself and Viscosity’s employees through an off-the-books cash payroll.
If convicted, the charge of aiding and assisting in the filing of a false tax return carries a potential sentence of up to three years in prison, up to one year of supervised release and a fine of up to $250,000.
United States Attorney Leah Foley and Thomas Demeo, acting special agent in charge of the IRS Criminal Investigation office in Boston, announced the charge. Assistant U.S. Attorney Benjamin Saltzman of the Securities, Financial and Cyber Fraud Unit is prosecuting the case.
