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
Monday, July 1, 2024

The regular filing period is from Monday, July 1, 2024 to Wednesday, October 2, 2024. However, your assessor is allowing late filings through Tuesday, December 31, 2024. Please click the Begin Personal Property Assessment button to file your assessment.

Regular Personal Property Filing Ends
Wednesday, October 2, 2024