Due to a last minute re-appraisal of NorthWestern Energy property in Montana, many counties including Ravalli County, will be re-setting their mill levy values.

The Ravalli County Commission voted to re-certify the taxable value of the mills Friday, October 21, which starts the process to re-set the amounts that will be reflected in the next tax bills. The paperwork involved will delay mailing the tax bills by at least three weeks, according to Clerk and Recorder Regina Plettenberg.

Plettenberg said the bills had not yet been printed, allowing the changes for Ravalli County. Most affected by the NorthWestern Energy re-assessment will be the school districts, which will have to submit new budgets to the state Office of Public Instruction, starting a series of adjustments involving the Montana Department of Revenue and Ravalli County. Then, the tax bills can be mailed. Plettenberg said that she expected the bills to be sent out any time between November 18 and November 30.

The state had originally set the energy company's property value at $2.6 billion and NorthWestern appealed. The Department of Revenue reached an agreement with the company for a $2.4 billion assessment a week ago. That made NorthWestern's tax bill about $10 million less than originally figured.