The median home price in California is $773,735. At 80% LTV, the typical loan is $618,988 at the current 6.76% average rate, producing a monthly P+I payment of $4,019. Total interest over 30 years at this rate: $827,802.
Property taxes in California average 0.7% of assessed value, or $5,416 per year on the median home. This adds $451/month to your all-in housing cost. When evaluating a refinance, factor in property tax and insurance for a complete picture.
California residents can deduct mortgage interest on state income tax returns for primary residences, subject to state-specific limits. The federal mortgage interest deduction applies on loans up to $750,000.