Delaware State Business Tax Extension Filing Instructions
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Last modified 3/20/2023 1:55:42 AM EST |
Added by ExpressExtension Team
Delaware doesn’t require businesses (C-corporations, partnerships, S-Corporations, and fiduciaries) to file a separate Business Tax extension form if they have already obtained a federal extension by filing Form 7004. Just remember to attach a copy of Form 7004 to your Delaware return when it’s filed.
If your federal extension was rejected or you didn’t apply for a federal extension, you can file a separate Delaware business tax extension Form to get an extension of time to file the Delaware business income tax return.
Extension Form to use
- C-Corporations - Use Form 1100-T-EXT, Delaware Corporate Income Tax Request for Extension
- S-Corporations - Use Form 1100-P-EXT, Delaware "S" Corporation Request for Extension
- Partnerships - Does NOT have a separate extension form to extend the partnership return. The approved Federal extension will extend the deadline of the Delaware tax return to the same date as your Federal extension is due.
- Fiduciaries - Use Form 400-EX - Application for Automatic Extension to File Delaware Fiduciary Income Tax Return.
Due Date to file Delaware Tax Extension
| Business Type | Actual Due Date | Extension Period |
| C-corporation | 15th day of the 4th month after the tax period ends (April 15 for calendar year filers) | 6-month extension |
| S-Corporation | 15th day of the 3rd month after the tax period ends (March 15 for calendar year filers) | 6-month extension |
| Partnership | 15th day of the 3rd month after the tax period ends (March 15 for calendar year filers) | 6-month extension |
| Fiduciary | Last day of the fourth month after the tax period ends (April 30 for calendar year filers) |
51/2-month extension |
Delaware tax extension Filing Method (Paper/Electronic)
The State of Delaware supports only paper filing to file DE tax extensions.
How to pay the state tax due?
You can choose to pay your balance due along with your extension by using any one of the following options:
- Pay through Electronic Funds Transfer
- Pay through Check or money order
Does ExpressExtension support this State filing?
No, we do not support Business tax extension filing with Delaware. If you are looking for an e-file solution for Federal Form 7004, you can file your extension and get approval within minutes with ExpressExtension.
Any Special Requirements?
An extension of time to file the Delaware return does NOT extend the time to pay any tax due. You must make your payment with the extension form by the original due date of the return.
For more information regarding Delaware business state tax extension, click here.