Calendar & Important Dates

Important Dates — Property Tax Calendar

The following dates and deadlines are provided to assist property owners in Alameda County. Dates marked with an asterisk (*) may shift to the next business day if they fall on a Saturday, Sunday, or legal holiday.

  • January 1
    Annual Lien Date. All taxable property is assessed as of 12:01 a.m.
  • *February 15
    Deadline to file exemption claims for homeowners, veterans, disabled veterans, welfare, cemetery, college, exhibitions, and churches.
  • April 1
    Due date for filing Business Personal Property statements.
  • *April 10
    Last day to pay second installment of secured property taxes without penalty.
  • *May 7
    Last day to file a Business Personal Property statement without a 10% penalty.
  • July 1
    Assessment roll delivered by Assessor to County Auditor-Controller. Start of the new assessment roll year.
  • July 2
    First day to file assessment appeal applications with the Clerk of the Board of Supervisors.
  • Mid-July
    Annual mailing of assessment notices to all Alameda County real property owners.
  • *August 31
    Regular roll unsecured taxes due.
  • September 15
    Filing deadline for Assessment Appeals with the Clerk of the Board of Supervisors.
  • *December 10
    Last day to pay first installment of secured property taxes without penalty. Also the deadline for filing late exemption claims for homeowners, veterans, and disabled veterans.

* If date falls on a Saturday, Sunday, or legal holiday, mail postmarked on the next business day shall be deemed on time.

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