1. The Tax Bill Determines Which Charges Can Be Challenged
The Assessor-Recorder sets assessed value, the Treasurer & Tax Collector bills owners, and the Assessment Appeals Board resolves valuation disputes. Each problem has a different remedy.
Assessed Value, Rates, and Direct Charges
Proposition 13 generally limits the basic property tax rate to 1%, with additional rates for authorized indebtedness. San Francisco's 2026–27 secured tax rate is 1.18162182%. Bills may also contain direct charges for particular services. Direct charges can raise a bill without changing assessed value. Check the block and lot, taxable value, exemptions, and line items. The Assessment Appeals Board cannot change rates or direct charges.
Homeowners' Exemption Requires a Separate Claim
California's Homeowners' Exemption deducts $7,000 from assessed value, not from the tax owed, for a qualifying principal residence occupied by its owner on January 1. A claim filed by February 15 generally qualifies for the full exemption. Rental and commercial properties do not qualify through ownership alone. Exemption claims follow separate procedures. Federal income and disposition taxes belong to broader real estate tax planning.
2. Base-Year and Market-Value Errors Need Different Evidence
An incorrect transfer reassessment and a temporary decline in value call for different legal tests and evidence.
Proposition 13 and Proposition 8 Apply Different Tests
Ownership changes and qualifying new construction generally establish a new base-year value unless an exclusion applies. Annual inflation adjustments generally cannot exceed 2%. Under Revenue and Taxation Code § 51, Proposition 8 allows a temporary reduction when January 1 market value is lower than the factored base-year value. During recovery, the assessment may increase more than 2% in a year, but generally cannot exceed that factored base-year value without another reassessable event.
Comparable Sales Must Match the Lien Date
For the 2026–27 roll, the valuation date is January 1, 2026. Use closed sales near that date, adjusting for size, condition, and permitted use. The 2026 informal-review instructions accept sales or appraisals with valuation dates no later than March 31. Commercial owners may support value with lease terms, vacancies, operating expenses, and suitable appraisal methods. A real property tax assessment review must connect those records to the specific valuation error.
3. Filing Windows Depend on the Assessment and Notice
An informal request does not preserve a formal appeal deadline. The assessment and notice control the filing window. An appeal does not suspend payment.
Informal Review and Tenancy-in-Common Property
For 2026–27, the Assessor-Recorder accepted informal Proposition 8 reviews from January 2 through March 31, 2026, for certain residences, including condominiums and cooperative units. Individual tenancy-in-common (TIC) units were excluded because they lack separate parcel numbers. TIC owners could still file formal appeals. Earlier Proposition 8 reductions also undergo annual review.
Regular Appeals and Base-Year Challenges
The ordinary 2026–27 filing window with San Francisco's Assessment Appeals Board ran July 2 through September 15, 2026. Certain failures to provide timely assessed-value notices can extend the period to November 30 under Revenue and Taxation Code § 1603. Owners must verify their notice rather than assume an extension. Under § 80, a qualifying base-year value may be challenged in its initial regular filing period or the next three annual periods, with later relief generally prospective.
Supplemental Assessments and Tax Payments
A taxable transfer or completed construction may trigger a supplemental assessment. An escape assessment addresses previously omitted value. Supplemental appeals generally must be filed within 60 days of the notice date or postmark, whichever is later. Escape appeals generally run 60 days from the date or postmark of the escape tax bill. Regular secured installments become delinquent after December 10 and April 10. Supplemental bills have different schedules. An appeal does not defer payment.
4. Closing Adjustments and Tax Disputes Are Distinct
Escrow adjustments, annual bills, and post-sale reassessments involve different obligations. Identify the tax year and responsible party before choosing a remedy.
Escrow Prorations Do Not Cover Later Bills
A closing statement may prorate annual property tax between buyer and seller. That private arrangement does not pay a supplemental bill issued after a reassessment. Compare the escrow statement, deed, and later notices. The local real property transfer tax is separate from annual property tax. The real estate transfer process explains the underlying transaction documents.
Documents That Support a Legal Case Review
A real estate tax case review begins with the assessment notice, tax bill, block and lot, deed, exemption filings, and prior appeals. Add comparable sales, dated photographs, appraisals, and commercial lease or income records where relevant. An attorney can evaluate the grounds for reassessment, present evidence, and check appeal or refund requirements. Federal income-tax disputes follow separate IRS procedures, as discussed in California IRS tax guidance.
12 Nov, 2026
