10/14/2026
🆘Tax Cost Calculations🆘
If a solar or battery project misses the December 31, 2026, completion deadline, the additional property tax assessment applies only to the appraised fair market value of the newly installed solar equipment (new construction), rather than triggering a full reassessment of the entire home will be added:
Calculation Example (San Jose / Santa Clara County):
Assessed Solar Value: $50,000 (appraised value of new panels + battery)
Base County Property Tax Rate: ~1.10% – 1.25% (Base Prop 13 rate + local school & municipal bonds)
Annual Added Tax Bill: $50,000 * 1.15% = $575 per year!