Lien Date
The lien date is the fixed annual date on which a home's taxable value is determined. In California it is January 1. Whatever your property is worth on that day sets the assessment for the tax year that follows, regardless of what happens to the market in the months after.
Why it matters to a homeowner
The lien date is a snapshot in time. If your home's value dropped sharply right before January 1, that lower value is what counts for the year, which can mean real savings. If it dropped after January 1, you generally have to wait until the next lien date to capture the change. Timing matters.
A concrete example
Suppose comparable homes near you were selling for $560,000 in December and your factored base-year value is $650,000. Because the market value on the January 1 lien date is lower, the assessor can enroll the reduced figure under Proposition 8. A rebound in spring does not undo that year's lower assessment.
How it affects your assessment or appeal
When you appeal, you must prove what your home was worth as of the lien date, not today. Comparable sales closest to January 1 carry the most weight. Pulling sales from the wrong period is one of the most common reasons an otherwise valid appeal fails.
For the official rule that the lien date is January 1, see the State Board of Equalization's Decline in Value – Proposition 8 page.
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