Property tax exemptions in Alameda County can lower your bill in several ways: a flat $7,000 reduction for owner-occupants, much larger exemptions for disabled veterans, full or partial relief for qualifying nonprofits, a reassessment exclusion for solar installations, base-year value transfers under Proposition 19, and a postponement program for low-income seniors and disabled homeowners. Every one of them runs through the Alameda County Assessor, and most turn on a February 15 filing deadline.
Homeowners’ Exemption
If you own your home and live in it as your primary residence, you qualify for a $7,000 reduction in assessed value under California Revenue and Taxation Code Section 218.1California Legislative Information. Revenue and Taxation Code – RTC 218 You have to occupy the property on January 1, the “lien date,” of the tax year. Single-family homes, condos, and units in multi-family buildings all qualify.
With California’s 1% base rate, the exemption is worth at least $70 a year, a little more once local bonds and assessments are added in. Modest, but the application takes minutes and only needs to be filed once. The exemption stays in place as long as you own and occupy the property.2California Department of Tax and Fee Administration. Homeowners’ Exemption Tell the assessor if you move out, rent the place, or transfer title.
Disabled Veterans’ Exemption
Veterans with qualifying service-connected disabilities receive a much larger benefit under Revenue and Taxation Code Section 205.5.3California Legislative Information. California Code Revenue and Taxation Code – RTC 205.5 To qualify, you must be blind in both eyes, have lost the use of two or more limbs, or be totally disabled from a service-connected injury or disease. “Totally disabled” means the VA has assigned a 100% disability rating or is paying at the 100% rate due to unemployability.4California State Board of Equalization. Letter to County Assessors No. 2024/005 – Disabled Veterans’ Exemption Eligibility Letters
The exemption has two tiers, and both amounts adjust for inflation each year:
- The basic exemption, available regardless of income, exempts $180,671 of assessed value for the 2026 assessment year.
- The low-income exemption exempts $271,009 for veterans whose household income falls below the annual threshold.
These are the 2026 figures from the Board of Equalization’s annual adjustment.5California State Board of Equalization. Letter to County Assessors No. 2025/014 – Disabled Veterans’ Exemption Increases for 2026 Unmarried surviving spouses of veterans who died from service-connected causes or while on active duty also qualify.6California Department of Tax and Fee Administration. BOE-261-G Claim for Disabled Veterans’ Property Tax Exemption Unlike the homeowners’ exemption, this one has to be claimed each year.
Welfare and Religious Exemptions
Property owned by qualifying nonprofits may be fully or partially exempt under the welfare exemption. The organization must be formed and operated exclusively for charitable, hospital, religious, or scientific purposes, must use the property for those purposes, and must hold a current tax-exempt determination from the IRS or the Franchise Tax Board.7State Board of Equalization. Property Tax Welfare Exemption Actual day-to-day use has to match the exempt purpose, not just the paperwork.
Smaller religious institutions can apply for the religious exemption instead, which streamlines the process for properties used primarily for worship and related educational activities.
Active Solar Energy System Exclusion
Adding solar panels normally triggers a reassessment as new construction. California currently excludes active solar energy systems from that reassessment, so installing them doesn’t raise your property taxes. The exclusion covers systems that collect, store, or distribute solar energy, including rooftop photovoltaic panels sized to the property’s electricity needs. Solar pool heaters, hot tub heaters, and passive systems are not covered.8California Department of Tax and Fee Administration. Active Solar Energy System Exclusion
The exclusion is scheduled to sunset on January 1, 2027. Finish the installation before that date to lock in the benefit. If the legislature doesn’t extend it, systems installed afterward will add to your assessed value.
Base Year Value Transfers Under Proposition 19
Proposition 19, effective April 2021, changed two things that matter for Alameda County property owners: it lets certain homeowners take their tax base with them when they move, and it narrowed the exclusion for property passed from parents to children.
Moving and Keeping Your Tax Base
If you’re 55 or older or severely disabled, you can sell your current home and transfer its assessed value (the “base year value”) to a replacement home anywhere in California.9California State Board of Equalization. Proposition 19 You can use this up to three times. The replacement has to be bought or newly built within two years of the sale.
If the replacement costs the same as or less than the old home sold for, the base year value transfers straight across. If the replacement costs more, the difference between the new home’s market value and the old home’s sale price is added to your transferred base year value. Long-time owners with decades of Proposition 13 protection can move without a full reassessment.
Parent-to-Child Transfers
Before 2021, a child could inherit a parent’s primary residence at the parent’s assessed value, plus up to $1 million in other property. Under Proposition 19, the child now has to use the inherited home as their own primary residence and file for the homeowners’ or disabled veterans’ exemption within one year of the transfer.10California State Board of Equalization. Proposition 19 Fact Sheet
There’s also a value cap. The excluded amount is limited to the taxable value at transfer plus an inflation adjustment. For transfers between February 16, 2025, and February 15, 2027, that adjustment is $1,044,586. Anything above the cap is added to the new assessed value. Children who don’t move in lose the exclusion entirely, and the property is reassessed at full market value.
Property Tax Postponement
California’s Property Tax Postponement Program lets qualifying homeowners delay paying current-year property taxes rather than eliminating them. You must be a senior, blind, or have a disability, your annual household income must be $55,181 or less, and you must have at least 40% equity in the home.11State Controller of California. Property Tax Postponement The postponed taxes become a lien and accrue interest, so this works like a loan from the state, not forgiveness. Useful for fixed-income homeowners who need cash flow now and can settle up when the property is sold or the estate closes.
How to Apply
All exemption claims go through the Alameda County Assessor’s Office, which has locations in Oakland and Hayward.
For the homeowners’ exemption, file Form BOE-266. You’ll need your Assessor’s Parcel Number (on your property tax bill) and the Social Security numbers of every owner living in the home.12California State Board of Equalization. California State Board of Equalization Information Sheet A Medicare or Medi-Cal number can substitute if you don’t have an SSN. Names on the form should match the grant deed recorded with the County Recorder. Keep utility bills or voter registration on hand in case the assessor asks for proof of residency.
Disabled veterans use Form BOE-261-G. You’ll need documentation of your VA disability rating; a 100% rating should be enough on its own, without medical files.13California Department of Tax and Fee Administration. Disabled Veterans’ Exemption The form also asks for the effective date of your rating and when the VA notified you.
The Alameda County Assessor’s website does not currently offer full electronic submission for exemption forms. Download the form online, then submit it by mail or in person.
Filing Deadlines and Late Claims
February 15 is the key date. File by then to get the full benefit for the upcoming fiscal year.14Alameda County Assessor. Calendar and Important Dates Miss it and you can still file a late claim through December 10, but the benefit is reduced.
How much you lose depends on the exemption. For the disabled veterans’ exemption, a claim filed after February 15 but by December 10 gets 90% of what a timely filing would have received. Later claims get 85%.15California Legislative Information. California Revenue and Taxation Code 276 The homeowners’ exemption has a steeper percentage penalty, though the dollar amount is smaller because the exemption is only $7,000.
The homeowners’ exemption is a one-time filing and stays with the property until you move, transfer ownership, or stop using it as your primary residence. The disabled veterans’ exemption has to be claimed every year.
New Buyers and Supplemental Bills
When you buy a home in Alameda County, the assessor reassesses at market value and usually issues a supplemental tax bill covering the difference between the old and new assessed values, prorated to the purchase date. If the previous owner wasn’t already claiming the homeowners’ exemption, you can apply the $7,000 exemption to that supplemental bill as long as you move in within 90 days of purchase; it gets prorated from the purchase date through June 30.16California Department of Tax and Fee Administration. Supplemental Assessment If the previous owner was already receiving the exemption, no extra reduction applies to the supplemental bill, but your claim will take effect the next fiscal year.
Exemptions vs. Assessment Appeals
Exemptions and appeals are two different things. An exemption reduces your taxable value by a fixed amount. An appeal, if it succeeds, resets the assessed value itself, which can produce much larger savings if you believe your home has been overvalued. Appeals in Alameda County go through the Clerk of the Board of Supervisors’ Assessment Appeals Unit and carry their own deadlines and $50 filing fee.17Alameda County Clerk of the Board of Supervisors. Assessment Appeals If your assessed value looks wrong, that’s the path; if you just want the exemptions you’re entitled to, stick with the assessor and the February 15 deadline.