Penn was released on bond until she is sentenced, a hearing for which is set in June.
Penn faces a maximum penalty of 5 years in prison and a fine of up to $250,000, according to the IRS.
Court records show Penn filed approximately 44 fraudulent income tax refund claims for 2008, 2009 and 2010, resulting in a loss to the IRS of $258,475.27, according to the release.
Officials said Penn prepared returns for neighbors, acquaintances and others then diverted portions of the fraudulent refunds into bank accounts and prepaid debit cards under her control.