Below, find details regarding the tax return due for S-corps. Specific IRS regulations pertain to this type of business entity.

IRS Form 1120-S and the associated Schedule K-1(s) for a calendar year S-corporation are due by March 15 following the close of the calendar year. Fiscal year returns must be filed on or before the 15th day of the third month following the close of the fiscal year. S corporations can obtain an automatic extension of six months by filing Form 7004.