Mason County Assessor
Online Filing

After filing online, do not return the paper form to the assessor's office. Online filing is not available for businesses at this time.

Filing Begins
Thursday, July 1, 2021

The regular filing period is from Thursday, July 1, 2021 to Friday, October 1, 2021. However, your assessor is allowing late filings through Friday, December 31, 2021. Please click the Begin Personal Property Assessment button to file your assessment.

Regular Personal Property Filing Ends
Friday, October 1, 2021