Form 1120-PC, U.S. Property and Casualty Insurance Company Income Tax Return
Use this form to report the income, gains, losses, deductions, credits, and to figure the income tax liability of insurance companies, other than life insurance companies.
Form 1120-POL, U.S. Income Tax Return for Certain Political Organizations
Political organizations and certain exempt organizations file this form to report their political organization taxable income and income tax liability section 527.
Form 1120-REIT, U.S. Income Tax Return for Real Estate Investment Trusts
Corporation, trusts, and associations electing to be treated as Real Estate Investment Trusts file this form to report their income, gains, losses, deductions, credits, certain penalties and income tax liability.
Form 1120-RIC, U.S. Income Tax Return For Regulated Investment Companies
Regulated investment companies (RIC) use this form to report their income, gains, losses, deductions, credits, and to figure their income tax liability.
Form 1120S, U.S. Income Tax Return for an S Corporation
Use this form to report the income, gains, losses, deductions, credits, etc., of a domestic corporation or other entity for any tax year covered by an election to be an S corporation.
Form 1120-SF, U.S. Income Tax Return for Settlement Funds (Under Section 468B)
Section 468B designated and qualified settlement funds file this form to report transfers received, income earned, deductions claimed, distributions made, and the income tax liability of a designated or qualified settlement fund.
Form 1120X, Amended U.S. Corporation Income Tax Return
Corporations use this form to correct a previously filed Form 1120 or 1120-A or to make certain elections after the prescribed deadline.
Form 2220, Underpayment of Estimated Tax by Corporations
Corporations, tax-exempt organizations subject to the unrelated business income tax, and private foundations use this form to determine whether they are subject to the penalty for underpayment of estimated tax and, if so, the amount of the underpayment penalty for the period that applies.
Form 4136, Credit for Federal Tax Paid on Fuels
Use this form to claim a credit for certain nontaxable uses (or sales) of fuel during your income tax year, the alternative fuel credit, and a credit for blending a diesel-water fuel emulsion.
Form 4466, Corporation Application for Quick Refund of Overpayment of Estimated Tax
Any corporation that overpaid its estimated tax for the tax year may apply for a quick refund if the overpayment is at least 10% of the expected tax liability and at least $500.
Form 4626, Alternative Minimum Tax—Corporations
Corporations use this form to figure their alternative minimum tax (AMT) under section 55.
Form 8842, Election to Use Different Annualization Periods for Corporate Estimated Tax
Corporations use this form to elect one of the two annualization options that can be elected under section 6655(e)(2)(C) to figure the corporation’s estimated tax payments under the annualized income installment method.