They had pleaded not guilty, but wrote a letter to the judge this week stating they wanted to change their pleas.
Marc Sorrentino, who also acted as his brother's manager, was charged with three counts of filing false tax returns from 2010 to 2012.
People has reported that Mike and Marc will face a court hearing on Friday, in which his brother could face up to 25 years in jail.
Their trial was scheduled to begin next month.
In April past year, additional charges were filed against the Sorrentinos. Klingeman said Sorrentino "deeply regrets his failure to pay taxes" but that he "only played a minor role in the actual misconduct". Mike Sorrentino was charged with two counts, as well as failure to file a tax return for 2011, when he allegedly earned almost $1.96 million.
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TMZ notes that Mike Sorrentino's attorneys, Henry E. Klingeman and Kristen M. Santillo, released a statement following the plea in which they call for leniency.
Sorrentino appeared on all six seasons of MTV's "Jersey Shore", a reality series that followed a group of rowdy housemates in New Jersey. He also claimed numerous personal expenses, including luxury cars and clothing, as business write-offs, according to court documents.
They were known for their drunken antics and the phrase they used to describe their lifestyle: 'gym, tan, laundry'.
Michael Sorrentino on Friday pleaded guilty to one count of tax evasion for deliberately concealing some of his income in 2011 by making cash deposits in amounts of less than $10,000 so they wouldn't trigger federal reporting requirements.
Former Republican Gov. Chris Christie criticized the show for promoting stereotypes, and previous year signed a bill capping the amount of state money universities can pay for speakers, after Rutgers University paid cast member Nicole "Snooki" Polizzi $32,000 in 2011. Last year, he signed a bill capping the amount of state money universities can pay for speakers, because Rutgers University paid "Jersey Shore" cast member Nicole "Snooki" Polizzi $32,000 in 2011.