Home Business Taxes Business Income Tax 2023 Business Income Tax Forms and Instructions 2023 Business Income Tax Forms and Instructions Corporation Income Tax Forms Number Title Description 500D Declaration of Estimated Corporation Income Tax Form used by a corporation to declare and remit estimated income tax for tax year 2023. 500D (2D) Declaration of Estimated Corporation Income Tax. Read PDF Viewer And/Or Browser Incompatibility if you cannot open this form. Form used by a corporation to declare and remit estimated income tax for tax year 2023. Pass-Through Entity Income Tax Forms Number Title Description 510/511D Declaration of Estimated Pass-Through Entity Tax Form used by a pass-through entity to declare and remit estimated tax for tax year 2023.