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Form 1100-EXT is a request to extend the deadline for filing the Corporation Income Tax return with the Delaware Division of Revenue. This extension does not extend the time for payment but provides an additional six months to file the return.
To use Form 1100-EXT effectively, corporations must submit the form before the original tax deadline. The form is used to apply for more time to organize and submit the necessary tax documentation without incurring late filing penalties. It’s important to note that any anticipated tax liabilities must be paid when the form is submitted to avoid interest charges on unpaid taxes.
Form 1100-EXT can be obtained through the Delaware Division of Revenue’s website, where it is available for download. Alternatively, it may be available through tax software programs that support Delaware state tax filings. Ensure you are using the most recent version to comply with any changes in form requirements or instructions.
The original deadline for filing corporation income tax in Delaware is generally on the 15th day of the fourth month following the close of the corporation’s fiscal year. Form 1100-EXT must be submitted by this date to qualify for a six-month extension.
Corporations that require additional time to gather required documentation or complete their tax preparations typically use Form 1100-EXT. This may include businesses facing unexpected delays in financial reporting or needing extra time to reconcile accounts.


Using Form 1100-EXT is a lawful method for Delaware corporations to request an extension for filing their income tax returns. This form ensures compliance with state tax regulation by communicating the intent to file and paying any near-term tax liabilities.
Failing to file Form 1100-EXT or the actual tax return by the deadlines can incur penalties. Late filing leads to additional fines, and unpaid taxes may accrue interest. It is critical to meet both submission and payment deadlines to avoid such penalties.
While Form 1100-EXT is primarily used by corporations, other business structures like LLCs electing to be taxed as corporations may also need to apply for an extension if their tax situation aligns with corporate tax reporting requirements. Partnerships typically don’t use Form 1100-EXT unless they are taxed as a corporation.
Modern tax software, such as TurboTax or QuickBooks, often includes capabilities to prepare and electronically file Form 1100-EXT. Confirm that your software supports Delaware state filings, which can streamline the process of calculating estimated liabilities and submitting the form.
Form 1100-EXT primarily applies to corporations rather than individual taxpayers like self-employed individuals, retirees, or students. These groups would typically use different forms tailored to individual income tax and extension needs. However, any corporate entity, irrespective of its primary stakeholder identity, can use this form for state tax filing purposes in Delaware.
By offering comprehensive steps and details about compliance and deadlines, corporations can efficiently manage their taxing needs while avoiding penalties and ensuring sufficient preparation time.

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