What Is Change of Ownership
A change of ownership occurs when property transfers to a new owner, triggering a reassessment of the property's assessed value for tax purposes. The county assessor's office treats this event as a "Prop 13 trigger," meaning the property gets reappraised at current market value, and your assessed value may jump significantly from the previous owner's base year value.
In California and similar jurisdictions, this is one of the few circumstances that breaks the rolling assessment lock. Without a change of ownership, properties typically increase in assessed value only 2% annually, regardless of actual market appreciation. When ownership transfers, that protection disappears temporarily.
Assessment Impact and Timing
The county assessor has 60 days from the date of transfer to notify you of a change of ownership and typically reassesses within 90 days. The new assessed value becomes effective on the lien date (July 1 in most California counties). If a property sold for $750,000 and the previous assessed value was $450,000, expect a new assessed value close to $750,000, assuming comparable sales support that price.
Assessors use three primary appraisal methods to determine new value: comparable sales analysis (comparing your property to recent sales of similar properties in your area), cost approach (replacement cost minus depreciation), and income approach (for rental properties, based on net operating income). The comparable sales method carries the most weight in residential markets.
Appeal Window and Assessment Ratio
You have until 60 days after the assessment notice arrives to file an appeal with the county assessor's office. If unsatisfied, you can request a Board of Review hearing, typically scheduled 30 to 90 days after your formal appeal filing. Bring recent appraisals, comparable sales data showing lower values, and documentation of any property condition issues (foundation problems, needed repairs, or roof defects) that reduce value.
The assessment ratio in your county matters. If your county's average assessment ratio is 80% (assessed value divided by market value), and your property sold for $500,000, the assessor should theoretically set the assessed value around $400,000. If they set it higher, you have grounds to appeal based on the jurisdiction's own assessment standards.
Exemptions and Exclusions
Certain ownership transfers do not trigger reassessment under Proposition 13. These include transfers between spouses, transfers from parents to children (up to $1 million per child in some cases), and transfers to trusts in specific circumstances. Filing the appropriate exemption claim with the assessor within a strict deadline (often 3 years of transfer) prevents reassessment. If you miss the deadline, the reassessment stands permanently.
Common Questions
- Can I appeal an assessed value if I just bought the property at that price? Yes. Market price at sale does not equal fair market value for assessment purposes. If comparable properties in your neighborhood recently sold for less, or if your property has condition issues not reflected in the sale price, you can argue for a lower assessed value. Bring recent appraisals and comparable sales data to your Board of Review hearing.
- What happens if I don't file an appeal within 60 days? Your right to appeal at the assessor level closes, but you may still petition the Board of Review directly within the statutory window (usually 30 days after the reassessment becomes effective). However, appeal rights become more limited, so file promptly.
- Does a family transfer avoid the change of ownership reassessment? If the transfer qualifies for a Proposition 13 parent-to-child or spouse exclusion, yes. You must file Form BOE 58-A or the appropriate exclusion form within three years of the transfer date. Missing this deadline results in permanent reassessment at market value.