An Overview of Delaware State Personal Income Tax Extension Forms

- Updated March 24, 2021 - 8.00 AM by Admin, ExpressExtension

Does Delaware support tax extension for personal income tax returns?


Yes, Delaware requires a separate tax extension Form to be filed with the state department apart from the federal tax extension Form 4868.

What Form does the state of Delaware require to apply for an extension?


Individuals in Delaware need to file Form 200-EX with the state to obtain a 6-month extension of time to file their personal income tax return with the state.

  • Form 200-EX - Request For Extension of Time For Filing Individual Tax Returns

Note: Make sure to pay any taxes due along with the extension Form to avoid penalties and interest.

When is the deadline to file Form 200-EX with the state of Delaware?


Delaware State individual tax extension Form 200-EX must be filed on or before the 15th day of the 4th month after the tax year ends (April 15 for calendar year filers).

How do I pay my balance due along with the extension Form?


If you owe Delaware state taxes, you must pay your tax due by the regular due date, or you will be charged with penalties and interest.

Make a tax payment with your extension using Form 200-V (Estimated Tax Declaration Voucher) and attach it to Form 200-EX.

You can pay the tax due online or mail your form using

Mailing Address for filing Extension with the State


Where do I mail the extension Form 200-EX?

Delaware Division of Revenue
PO Box 2044
Wilmington, Delaware 19801-2044

Where do I mail the payment Form 200-V?

Delaware Division of Revenue
P.O. Box 830
Wilmington, DE 19899-0830