Important dates and deadlines for property owners, businesses, and tax professionals in Alameda County. All dates apply to the current fiscal year unless noted.

Key Property Tax Dates for Alameda County
Date Event / Deadline Who It Affects
January 1 Lien Date — Property taxes for the upcoming fiscal year attach to the property as of this date. Value and ownership are determined as of 12:01 AM. All property owners
February 15 Exemption Filing Deadline — Last day to file Homeowners’ and Disabled Veterans’ Exemption claims for full exemption value. Late claims (through Dec 10) receive 80%. Homeowners, Veterans
April 1 Business Property Statements Due — Businesses must file Form 571-L reporting all taxable business personal property. Business owners
April 10 Second Installment Due — Second installment of property taxes due. Becomes delinquent after this date (penalties apply). All property owners
May 7 Business Property Penalty Date — 10% penalty applied to late-filed business property statements. Business owners
July 1 Fiscal Year Begins — New fiscal year for property tax purposes (July 1 through June 30). All property owners
July 2 Assessment Roll Delivered — Assessor delivers the annual assessment roll to the Auditor-Controller. Assessor / Auditor
September 15 Assessment Appeal Deadline — Last day to file a formal appeal of your assessed value with the Assessment Appeals Board for the current roll. Property owners
November 1 First Installment Due — First installment of property taxes due for the current fiscal year. All property owners
December 10 First Installment Delinquent — Penalty applies if first installment is not paid by this date. Also the last day for late exemption claims (80% value). All property owners

Important Notes

  • If a deadline falls on a weekend or holiday, the due date is extended to the next business day.
  • The fiscal year runs from July 1 through June 30.
  • Supplemental tax bills have their own separate due dates — check your supplemental bill for details.
  • Property tax payments are made to the Treasurer-Tax Collector, not the Assessor.

Questions About Dates or Deadlines?

Contact the Assessor’s Office for assessment-related dates, or the Tax Collector for payment deadlines.

Assessor: (510) 272-3787 | Tax Collector: (510) 272-6800