As a result of a recent audit of Municipal Utility Taxes (MUT), there was an inadvertent error made by Ameren’s billing department that affects Ameren customers of Collinsville and several surrounding communities. Ameren was not charging MUT tax on several customer accounts from 2009-2012. The affected customers in Collinsville will be charged accordingly with the proper MUT tax going forward. Only those who were not previously billed with the MUT tax will be charged the additional back-billed amount (approx. $10 extra per month). No resident or business is required to pay the MUT because a previous occupant of the home or business did not pay the tax. For further details, the Ameren Settlement Agreement is available.