California State Taxes: Complete Guide

California imposes some of the highest individual income tax rates in the nation, reaching 13.3% for income above $1 million and 9.3% for income above $66,295. The statewide sales tax base rate is 7.25%, and local district taxes push it to 10.25% or higher in Los Angeles, San Francisco, and other major cities. Businesses operating in California must collect and remit sales tax monthly for high-volume sellers, and file the California Department of Tax and Fee Administration (CDTFA) returns on time or face a 10% failure-to-file penalty. Payroll taxes include state income tax withholding, State Disability Insurance (SDI) at 1.1% of wages, and Employment Training Tax (ETT); the Employment Development Department (EDD) aggressively audits misclassified independent contractors. Back taxes in California grow fast: the Franchise Tax Board (FTB) charges 5% penalty for late filing, 25% for fraud, and monthly interest on the combined balance. The FTB issues tax liens, orders wage garnishments of up to 25%, levies bank accounts, and can suspend business entity status, preventing companies from operating legally. Californians who move out of state are frequently audited for residency fraud; the FTB asserts California source income for years after departure. Relief options include FTB installment agreements, financial hardship deferrals, and Offer in Compromise for taxpayers who can demonstrate inability to pay the full liability.