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 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.