Legal Foundation Statute: California Revenue & Taxation Code (R&TC) § 23455 adopts the federal AMT regime (IRC § 55) with state-specific rates and adjustments. Rate: 6.65 percent of California alternative minimum taxable income (AMTI) after the state exemption; 8.65 percent for banks and financial corporations. Exemption: First $40,000 of AMTI is exempt; the exemption is […]