Edit, Download, and Sign the Illinois Department of Revenue Signature Declaration
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How do I fill this out?
To fill out the Signature Declaration, start by entering your name, identification number, and address. Next, select the tax type that applies to you and provide your daytime telephone number. Finally, sign and date the form where indicated.

How to fill out the Illinois Department of Revenue Signature Declaration?
1
Enter your personal information accurately.
2
Select the relevant tax type from the options.
3
Provide your daytime telephone number.
4
Sign and date the form accordingly.
5
Submit the completed form as instructed.
Who needs the Illinois Department of Revenue Signature Declaration?
1
Individuals filing their personal income tax returns.
2
Businesses verifying their sales tax submissions.
3
Tax professionals assisting clients with filed documents.
4
Non-profits undergoing tax verification.
5
Partnerships requiring signature declaration for tax filings.
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What are the instructions for submitting this form?
To submit the Signature Declaration form, mail it to the Illinois Department of Revenue at PO Box 19084, Springfield, IL 62794-9084. For faster processing, consider faxing the form to the department or submitting through their online portal, if available. Always include your identification details to avoid processing delays.
What are the important dates for this form in 2024 and 2025?
Important dates for submitting the Signature Declaration may vary annually. Generally, ensure you submit this document by the tax filing deadline to avoid penalties. In 2024 and 2025, check the latest IRS updates for accurate dates.

What is the purpose of this form?
The primary purpose of the Illinois Department of Revenue Signature Declaration form is to verify the authenticity of tax filings. This form serves as a declaration under penalties of perjury regarding the accuracy of the submitted documents. Completing this form is essential for compliance with state tax regulations.

Tell me about this form and its components and fields line-by-line.

- 1. Name as shown on return: Full name of the taxpayer as it appears on the tax return.
- 2. Identification number: Respectively, Social Security or Tax Identification number.
- 3. Address: Complete mailing address of the taxpayer.
- 4. Tax type: Selection of tax type applicable to the taxpayer.
- 5. Signature: Authorized signature affirming the truth of the submission.
What happens if I fail to submit this form?
Failure to submit this form can lead to penalties or interest charges. The Illinois Department of Revenue may also question the validity of the associated tax filings. It is crucial to adhere to submission requirements to avoid complications.
- Penalties: Additional fines may be imposed for not submitting the declaration.
- Tax Misfiling: Inaccuracies or missing signatures can result in tax mishaps.
- Delayed Processing: Failure to submit may result in delays in tax return processing.
How do I know when to use this form?

- 1. Original Return Filing: Use when submitting an original tax return.
- 2. Amended Return Filing: Necessary for amended returns that require verification.
- 3. Verification Requests: Respond to any request for documentation through the declaration.
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