Schedule C Deductions In California
Schedule C deductions allow California self-employed individuals and sole proprietors to subtract ordinary and necessary business expenses from gross income before calculating both federal and California state taxes. Common deductions include home office expenses, vehicle mileage, business insurance, professional services, advertising, and equipment purchases under Section 179.
California generally conforms to federal Schedule C rules, but there are notable differences. California does not fully conform to federal bonus depreciation rules, meaning large equipment deductions may need to be adjusted on the California return. California also has its own self-employment tax considerations through the state's SDI program for certain business structures.
California filers should keep receipts, mileage logs, and home office measurements throughout the year. Given California's high state income tax rates — up to 13.3% — maximizing Schedule C deductions has an outsized impact on total tax liability compared to lower-tax states.