global Tax September 15th—Corporate Tax Filing Deadline September 08, 2017 Corporations may have a filing deadline coming up! Attention corporations....there’s a tax filing deadline coming up! You may need to submit Forms 1120 and 1120S by September 15. What exactly is due? If you requested an extension for the following forms, they are due by September 15.... 1. 1120 (C-corporation income tax returns, due April 17, 2017)- Corporate taxes are reported using Form 1120 for U.S. corporations. The deadline for C-corp returns is generally the 15th day of the fourth month following the end of the corp’s fiscal year. For calendar year taxpayers who chose to file for an extension at April 15, your extended due date is October 15. Note that for C corps with a fiscal year ending on June 30, the first deadline remains September 15 (which is the 15th day of the third month following the end of the fiscal year). 2. 1120S (S Corporation returns, due March 15, 2017)- This tax return, which includes Schedule K-1, is used to report the income, losses and dividends of S corporation shareholders. Schedule K-1 is prepared for each individual shareholder and allocations are based on the percentage of company shares owned by each shareholder during the tax year. Extended returns are due September 15. Wait....isn’t there another deadline on September 15? Yes! Third quarter estimated tax payments (IRS Form 1040ES) are due for individuals and trusts that report on a calendar year end. In addition, C corps that report on a fiscal year ending in March, June, September or December may have a quarterly estimated payment due as well. Don’t forget to submit your forms—there are penalties and charges for late filings. Contact our Tax Services Team for more information.