Form IL-56, Notice of Fiduciary Relationship, is an important document issued by the Illinois Department of Revenue. It is used by fiduciaries—such as guardians, trustees, and executors—to officially notify the state of their relationship with a taxpayer or entity under their care. This form provides the Illinois Department of Revenue with essential information about the fiduciary’s identity, the taxpayer they represent, and details about any associated liabilities. The form helps establish the fiduciary’s authority to act on behalf of the taxpayer and ensures compliance with Illinois state tax regulations. In short, the IL-56 is necessary for anyone acting in a fiduciary role who needs to notify the state about their responsibilities and provide required tax-related information. It is particularly important for estates, trusts, or guardianships where a fiduciary is responsible for managing a taxpayer’s affairs.
How To File IL-56
Filing Form IL-56 involves submitting the completed form to the Illinois Department of Revenue. The form is available electronically and must be filed online via the Illinois Department of Revenue’s e-filing system. It’s important to provide accurate information on the form, as incomplete or incorrect filings can lead to delays or penalties. You will need to complete all five sections outlined below to ensure the form is processed efficiently.

How To Complete IL-56
Step 1: Identify the Fiduciary and Taxpayer
This section requires you to provide personal information for both the fiduciary and the taxpayer being represented.
- Fiduciary Information:
- Name of Fiduciary: Enter the full name of the fiduciary acting on behalf of the taxpayer (guardian, trustee, executor, etc.).
- Mailing Address: Enter the fiduciary’s complete mailing address, including the street address, city, state, and ZIP code.
- Phone: Provide the fiduciary’s phone number.
- Email Address: Enter the fiduciary’s email address for contact purposes.
- Taxpayer Information:
- Name of Individual, Estate, or Trust: Enter the name of the taxpayer (the individual, the estate of a decedent, or the trust).
- Mailing Address: Provide the taxpayer’s mailing address (street address, city, state, and ZIP code).
- Taxpayer’s Identification Number (SSN or FEIN): Provide the taxpayer’s Social Security Number (SSN) or Federal Employer Identification Number (FEIN), depending on the type of taxpayer.
- If an Estate, Enter the Decedent’s Date of Death: If the taxpayer is an estate, include the date of death of the decedent in the format (MM/DD/YYYY).
Step 2: Describe the Satisfactory Evidence of Authority
- Satisfactory Evidence: In this section, you need to describe the documents you have attached as evidence of your authority to act in the fiduciary role. This could include court orders, trusts, or any other legal document granting you the fiduciary responsibility for the taxpayer.
Step 3: List the Nature and Extent of Liabilities
- Applicable Years: Enter all the years for which you are acting as a fiduciary.
- Tax Type: Specify the type of tax for which you are responsible (e.g., income tax, retailers’ occupation tax).
- Tax Due or Refund Status: Indicate whether additional tax is due or if a refund is expected.
- Return or Payment Required: Specify if a return or payment is required for each applicable tax type listed.
Step 4: Complete This Step When You Terminate a Prior Fiduciary Relationship
If you are replacing a previous fiduciary, complete this section with the following details:
- Name of Prior Fiduciary: Enter the full name of the prior fiduciary you are replacing.
- Mailing Address: Provide the mailing address for the prior fiduciary.
- Phone: Provide the phone number of the prior fiduciary.
- Email Address: Enter the email address of the prior fiduciary.
- Date of Termination: Enter the date when the prior fiduciary relationship was terminated in the format (MM/DD/YYYY).
Step 5: Sign Below
- Signature of Fiduciary: The fiduciary must sign the form, certifying that all information provided is accurate and complete to the best of their knowledge.
- Title: Enter the fiduciary’s title (e.g., guardian, trustee, executor).
- Date: Provide the date you are signing the form.