The Illinois Municipal Retirement Fund (IMRF) has set the City’s contribution for 2013 at 12.32%. The 2012 rate was set at 11.42%. Almost all City employees except sworn police officers and firefighters participate in IMRF. The IMRF rate is much lower than the rates for the Champaign Police and Firefighters Pension funds, which are 51.1% and 51.06%, respectively, for the 2012 tax levy collected in 2013.