The due dates for tax payments are printed on the coupons attached to the bottom of the bill. The 1st installment is due on November 1, and is delinquent at p.m.The due date to file your California state tax return and pay 5 any balance due is April 15, 2025. Due date for filing Business Personal Property statements. April 10: Last day to pay second installment of property taxes without penalty. The first installment of Alameda County Property Taxes is due on November 1, 2024 and will be delinquent at 5 p.m. On December 10, 2024. The second installment is due on February 1st, with a delinquency date of April 10th. AutoPay is a convenient option in which bills will be paid automatically each billing cycle on the due date using your default credit card or bank account.