Corporate Resource Services, at one time the 22^nd-largest US staffing firm, reported its financial statements for the fiscal year ended Jan. 3, 2014, along with subsequent quarterly financial filings, cannot be relied on, according to a filing with the US Securities and Exchange Commission.

The firm cited material uncertainties related to payroll tax matters. The PEO used by Corporate Resource Services earlier this year filed for bankruptcy protection citing $95.2 million in taxes owed the IRS.

Corporate Resource Services ceased substantially all sales and is closing production offices. It also reported it 10-K for the most recent fiscal year ended Jan. 2, 2015, will be delayed, and it is unable to estimate when or if it will be released.