California Mortgage Interest Deduction 2026 Rules Change
California homeowners will see notable changes beginning with the 2026 filing season, as federal law restores the deductibility of private mortgage insurance while state rules continue to allow higher mortgage interest limits than federal standards. The updates affect how deductions are calculated on a tax return and may influence whether filers claim the standard deduction or itemized deductions.
Starting with tax year 2026, homeowners who itemize can again deduct qualifying private mortgage insurance premiums as part of the mortgage interest deduction. The provision had expired after 2021, leaving many borrowers unable to deduct PMI costs for several years.
The deduction was made permanent under the One Big Beautiful Bill Act, which ended the repeated expirations that had created uncertainty for homeowners. PMI is generally required when a buyer puts down less than 20 percent on a home purchase, and premiums can add thousands of dollars annually to housing expenses.
Although PMI deductibility returns, the broader federal framework governing mortgage interest remains unchanged. Interest is deductible only on up to $750,000 of qualified mortgage debt, or $375,000 for married taxpayers filing separately.
This mortgage interest deduction limit was established under the Tax Cuts and Jobs Act and remains applicable to loans originated after December 2017. Homeowners with balances above the cap must prorate their deductible interest, which can reduce the overall value of the home mortgage deduction on a federal return.
California does not fully conform to federal mortgage interest rules. For state tax purposes, homeowners may deduct interest on mortgage debt of up to $1 million, allowing some borrowers to claim a larger deduction on their California return than on their federal filing.
This difference is particularly relevant in higher-cost housing markets. The adjustment between federal and state calculations is reported using Schedule CA, which reconciles itemized deductions for California purposes.
California’s standard deduction is significantly lower than the federal amount, making itemizing more attractive for many homeowners. In cases where a taxpayer claims the federal standard deduction, itemizing at the state level may still result in a reduced California tax liability.
Mortgage interest may be combined with other allowable expenses, including charitable deductions and specific medical and dental expenses, to exceed the state threshold. Taxpayers must evaluate each return separately to determine which method provides the greater benefit.
The 2026 changes do not expand deductibility for all housing-related borrowing. Interest on home equity loans or lines of credit remains deductible only when the borrowed funds are used to buy, build, or substantially improve the home securing the loan.
Using home equity for personal spending, debt consolidation, or unrelated purchases does not qualify. These limits apply regardless of a taxpayer’s income level or tax bracket.
Differences between federal and California rules can result in meaningful variations in refunds or balances due. Homeowners with larger mortgages or PMI costs are most likely to see the impact.
While the changes do not affect unrelated provisions such as tax credits, the SALT deduction, or the alternative minimum tax, they may influence broader filing decisions. Taxpayers are encouraged to review official guidance before filing.
By William Mc Lee, Editor-in-Chief & Tax Expert—Get Tax Relief Now
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