In prepared remarks, Deputy Assistant Secretary Mark Mazur told Congress on Thursday that the so-called tax gap will only worsen over the next several years without more funding from lawmakers.
He added that the estimate of the gross tax gap is around $580 billion for 2019 alone.
"Over the coming decade, the gross tax gap is projected to total approximately $7 trillion, roughly 15 percent of all owed taxes," Mazur told House lawmakers.
"A larger tax gap generates the following results: higher tax rates elsewhere in the system, lower revenues to fund the nation's fiscal priorities, or higher budget deficits and larger amounts of federal debt," he added.
Mazur blamed the persistent and growing tax gap on insufficient funding for the Internal Revenue Service.
Mark Mazur, Mazur
Treasury Department, Internal Revenue Service, IRS