Why your tax bill will not match the seller's, what arrives in your mailbox 6 months after closing, and how Prop 19 changed estate planning.
California property taxes have two unique features that surprise buyers from other states: Proposition 13 caps the assessed-value increase at 2% per year regardless of market value, and a supplemental bill arrives 6 to 9 months after closing to catch your tax basis up to the purchase price. Understanding both is critical to budgeting accurately.
California's base property tax rate is 1% of assessed value. Local jurisdictions add bonds and special assessments that bring the effective rate to 1.1% to 1.25% in most parts of Ventura County. On an $830K assessed home, that is roughly $9,100 to $10,400 annually.
Property tax bills come from Ventura County Assessor twice a year: November 1 and February 1, with discounts for early payment. Most homeowners pay through their mortgage impound account.
California Proposition 13 (1978) sets your tax basis at the purchase price and caps annual increases at 2% regardless of market value. This means a home bought in 2010 for $400K may now have an assessed value of about $490K (after 14 years of 2% increases) even if its market value is $850K.
The seller's current property tax bill does not predict yours. Your bill will be calculated on your purchase price, not the seller's long-held basis. Always estimate property tax on the purchase price for budgeting.
The supplemental property tax bill is the most common California tax surprise for new buyers. After closing, the County Assessor recalculates your property tax based on the purchase price (your new basis) and sends a one-time supplemental bill that covers the difference between the seller's old basis and your new basis, prorated for the time between sale close and the next regular tax cycle.
On an $830K Simi Valley home where the seller had owned for 10 years at a basis of $480K, the supplemental bill could be in the range of $5,000 to $8,000, arriving 6 to 9 months after closing. Most lender impound accounts do not include a supplemental reserve, so this often comes out of pocket.
Proposition 19 changed two important things:
Eligible homeowners 55+ (also disabled persons and disaster victims) can transfer their property tax basis from their current home to a new home anywhere in California, with limits. Previously, this was restricted to certain counties only and limited to one transfer.
Children inheriting parents' homes used to keep the parents' low Prop 13 basis indefinitely (the "parent-child exclusion"). Under Prop 19, the basis transfer only applies if the inheritor lives in the home as their primary residence within one year. Otherwise, the home is reassessed at market value, often dramatically increasing property tax.
Estate planning involving California real estate became more complex after Prop 19. Talk to an estate attorney before assuming your kids will inherit your low basis.
Effective rate is 1.1% to 1.25% of assessed value. On an $830K home, expect $9,100 to $10,400 per year.
Prop 13 caps base property tax at 1% of assessed value, with assessed value increases capped at 2% annually. The basis is set at purchase and only resets on a sale or qualifying remodel.
After closing, California sends a one-time bill catching your property tax up from the previous owner's assessed value to your purchase price. Budget $5K to $8K for this 6 to 9 months after closing.
No. The seller's bill reflects their old basis. Your bill will be calculated on your purchase price. Always estimate on purchase price.
No. Refinancing does not trigger reassessment. Your basis stays the same.
Only the new construction is added to your basis. The existing home's basis is not affected.
A 2020 California ballot measure that expanded senior basis transfers (anywhere in CA, up to three times) and tightened inherited-home rules (children must use as primary residence within a year).
Typically 30 days from the bill date to avoid penalties. Many counties allow installment payments.
Yes. If you believe your assessed value is too high, you can appeal to the Ventura County Assessment Appeals Board. The window to appeal is short, typically 60 days from the assessment notice.
Ventura County Assessor's online portal lets you look up any property's current assessed value and tax bill. Most homeowners pay through mortgage impound accounts.
I can pull the current basis, estimate your post-purchase tax, and project the supplemental bill for any home you are considering.
Talk to Brian