The Delaware Division of Revenue sent out a notice yesterday of new tax return dates for corporations required by the Internal Revenue Code.

From the release:

• Partnership returns are due on or before the 15th day of the third month following the expiration of the taxable period (March 15 for calendar year taxpayers).
• S corporation returns are due on or before the 15th day of the third month following the expiration of the taxable period (March 15 for calendar year taxpayers). This has not changed from prior years.
• Returns for C corporations are now due on or before the 15th day of the fourth month following the expiration of the taxable period (April 15 for calendar year taxpayers).
• Delaware has issued TIM 2017-1 granting an automatic extension of time to all C corporations to the due date of the corporation’s federal income tax return, without regard to extensions.
• The Delaware due dates for partnership and S corporation returns have not changed. As a result, the due dates for Delaware business returns for the 2016 tax year are as follows:
  • Partnership returns are due on or before the 30th day of the fourth month following the expiration of the taxable period (April 30 for calendar year taxpayers).
  • S corporation returns are due on or before the 30th day of the third month following expiration of the taxable period (March 30 for calendar year taxpayers).
  • Returns for C corporations are now due on or before the 15th day of the fourth month following the expiration of the taxable period. Because of federal holidays, this will be April 18, 2017 for calendar year taxpayers.

The release also stated that Delaware will adopt the same due dates for Delaware's business tax returns as required by the IRS. Pending legislation, this would be effective for tax years beginning after December 31, 2016.

Specific information is available here or by contacting the Division of Revenue at (302) 577-8205