Form 500: Corporation Income Tax Return is used by a corporation and certain other organizations to file an income tax return for a specific tax year or period.
Form 500CR: Business Tax Credits is used by individuals and businesses to claim allowable business tax credits. For tax years beginning after 2012, this form must be submitted electronically. Form 500CR is no longer available. See Form 500CR-Instructions.
Form 500D: Declaration of Estimated Corporation Income Tax is used by a corporation to declare and remit estimated income tax.
Form 500DM: Decoupling Modification is used by corporations to determine the amount of required modification associated with the provisions of federal law.
Form 500E: Application for Extension of Time to File Corporation Income Tax Return is used by a corporation to request an extension of time to file the corporation income tax return and to remit any balance of tax due.
Form 500UP: Underpayment of Estimated Income Tax by Corporations is used by a corporation to calculate the amount of interest and penalty for failure to pay the required amount of estimated income tax when due.
Form 500X: Amended Corporation Income Tax Return is used by a corporation to correct an error in a previously filed tax return (Form 500).
Generally, S corporations, partnerships and limited liability companies (LLCs) should not file a corporation income tax return. These businesses must file as pass-through entities.