Option 1: Pay all or some of your Delaware income taxes online via: Delaware Taxpayer Access Point.
Option 2: If you owe DE income taxes, you will either have to submit a DE tax return or extension by the tax deadline in order to avoid late filing penalties. You can only eFile and IRS tax extension, but not a Delaware extension. The tax extension will only avoid late filing penalties until the October deadline.
Note: Unless you pay all your Taxes or eFile your tax return by the October deadline, the late filing penalties will start again after that deadline.
Option 3: Complete Form PIT-EXT, include a Check or Money Order, and mail both to the address on Form PIT-EXT. Important: Even if you filed an extension, you will still need to file your DE tax return either via eFile or by paper by the October deadline.