How do I file a Delaware extension?
To extend your due date for submitting your income tax return (from May 17, 2021 to October 15, 2021), submit the following to the Delaware Division of Revenue no later than May 17, 2021:
- Your payment of any balance of tax liability estimated to be due for tax year 2020 AND
- The completed copy of DE Form 200EX .
You can fill out Form 200-EX online
, email a copy to DOR_PublicService@delaware.gov, or mail a copy to the Division of Revenue, P.O. BOX 830, Wilmington, DE 19899-0830.