When to file s corporation election?

• The Form must be filed on or before the 15th day of the 3rd month of the corporation's tax year in order for the election to be effective as of the beginning of that tax year. A corporation that is on a calendar tax year must file on or before March 15th in order for the election to be effective for that tax year.
• The S Corporation election must be filed with the Internal Revenue Service along with your state if applicable.
• If, due to any reason you forgot to send s corporation election form, you can give the IRS a reasonable cause to allow your taxes as a s corporation