CIT-EXT: Corporate Request for Extension (Revision)
Delaware · Delaware Division of Revenue · Used for tax years 2025
Form CIT-EXT is Delaware’s 2025 Corporate Income Tax Request for Extension. It includes a worksheet to calculate the amount due with the extension using estimated Delaware taxable income, credit carryover, and estimated tax paid.
Who files this form
Delaware Form CIT-EXT is a corporate income tax extension request. This edition is for tax year 2025. The form does not state which corporations are required to submit it.
What you'll need
Have the following information ready to complete the form:
- Corporation name, taxpayer ID and mailing address.
- Calendar or fiscal year ending, due date and requested extension date.
- Estimated Delaware taxable income, credit carryover and estimated tax paid.
- Payment amount.
- Authorized signer's printed name, signature, date, email address and phone number.
The form does not list specific supporting documents to attach.
How to file
Complete the corporation information and the taxpayer's worksheet. Enter the balance due from worksheet line 7 and the amount of your payment in the spaces provided.
Sign and date the form, and provide the authorized signer's printed name and contact information.
Mail the completed form with remittance payable to:
Delaware Division of Revenue
PO Box 0830
Wilmington, DE 19899-0830
Keep the page intact and retain a copy for your records. The supplied form does not provide e-filing instructions.
Common mistakes
- Forgetting to sign: The form reminds you to sign before submitting it.
- Not keeping a copy: Keep a copy for your records.
- Cutting the page: The form explicitly says, “DO NOT CUT THIS PAGE.”
Questions people ask
Which tax year is this edition for?
This edition of CIT-EXT is for tax year 2025.
How do I calculate the amount due with the extension?
Worksheet line 7 instructs you to subtract line 6 from line 5. Enter that result in the “Balance due from line 7 of worksheet” field.
What if I am also filing a request for change form?
Check the box labeled “Check here if a request for change form is being filed.”
Who signs the form?
The form requires an authorized signature and the authorized signer's printed name. The signer declares under penalties of perjury that they have examined the return, including accompanying schedules and statements, and believe it is true, correct and complete.