California Form 100S – Fill Out and Use This PDF

California Form 100S PDF Details

California Form 100S is the official S Corporation Franchise or Income Tax Return required by the California Franchise Tax Board (FTB). All S corporations doing business in California must use this form to report income, deductions, tax credits, and capital gains for the tax year. The form applies to calendar year filers and fiscal year filers, and must be filed even when no tax is owed.

Form 100S includes several required schedules and supplementary forms. Schedule B covers dividend income deductions. Schedule C reports available tax credits. Schedule D handles capital gains and losses. Schedule H provides information about the S corporation's shareholders and their respective shares. Schedule K-1 details each shareholder's portion of income, deductions, and credits. Additional forms include FTB 3539 for payment vouchers on automatic extension requests and FTB 3805Q for net operating loss computations.

California has several differences from federal tax treatment for S corporations. The state does not conform to all federal tax reforms, so filers must review California-specific rules for depreciation limitations, net operating loss deductions, and other adjustments. S corporations must also file information for any Qualified Subchapter S Subsidiaries (QSubs) on a separate schedule. For related corporate tax filing, see California Form 100-WE for water-edge combined group elections and California Schedule R for apportionment and allocation of income.