Q: Why isn't the reduction permanent? A: The County Assessor by law has to re-evaluate all properties that claim a Proposition 8 Decline in Value. By law proposition 8 is for temporary reduction in value. If the market recovers and the value climbs above the Proposition Base Value than the Proposition 13 assessment applies. Therefore each year the Assessor has to determine market value. Each County has its own process for subsequent year filings - we make it easy for you by monitoring this for you and ensuring that you are not paying for than the amount mandated by California law. The good news is that you can never pay more than the Proposition 13 rate - so you have nothing to lose by filing for Proposition 8.