Federal Corporate Income Tax
If a business’s fiscal year corresponds to the calendar year this is due by March 15.
C-Corporations file form 1120 to pay income tax. Limited liability companies classified as corporations must also file this form. LLC that are sole proprietorships can file a Schedule C of the 1040 series to report income. Generally an S-Corporation is not liable for federal income tax, but needs to file form 1120S. Some investment income and capital gains is taxed.