IRS Authorized E-file Provider for Tax Extension Forms

Illinois
State Business Tax Extension

Illinois Requires:

  • The state of Illinois doesn’t require any extension Form as it automatically grants extensions up to
    6 months.
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IRS Authorized E-file Provider for Tax Extension Forms

File Form 7004 and Extend your Federal Business Income Tax Return Deadline up to 6 Months.


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An Overview of Illinois State Business Income Tax Extension Forms

- Updated Feb 27, 2021 - 8.00 AM by Admin, ExpressExtension

Does Illinois support tax extension for business tax returns?

Yes. The state of Illinois supports the automatic extension of time to file business income tax returns with
the state.

What Form does the state of Illinois require to apply for
an extension?

There is no state-specific form to request an extension, as the state of Illinois automatically provides the extension for up to 6 months for businesses to file an income tax return with
the state.

How do I pay my balance due to the state of Illinois with
my extension?

You can choose to pay your balance due along with your return by using any one of the following options:

  • Electronic Payments through https://mytax.illinois.gov/
  • ACH Credit through https://mytax.illinois.gov/
  • Credit Card
  • Check or money order
    • Use Payment Voucher Form
      IL-1120-V - If your business is
      a Corporation
    • Use Payment Voucher Form
      IL-1120-ST-V - If your business is a Small
      Business Corporation
    • Use Payment Voucher Form
      IL-1065-V - If your business is
      a Partnership

When is the deadline to file a business tax return with the State
of Illinois?

  • Businesses in Illinois (operating as C-Corporations) must file their
    Form IL-1120 by the 15th day of the 4th month following the end of their accounting period.
  • Businesses in Illinois (operating as S-Corporations) must file their
    Form IL-1120-ST by the 15th day of the 3rd month following the end of their accounting period.
  • Businesses in Illinois (operating as a partnerships) must file their
    Form IL-1065 by the 15th day of the 4th month following the end of their accounting period.
  • Businesses in Illinois (operating as Fiduciaries) must file their
    Form IL-1041 by the 15th day of the 4th month following the end of their accounting period.
  • Businesses in Illinois
    (operating an Exempt Organization)
    • If 501(c) trusts must file their Form IL-990T by the 15th day of the 5th month following the end of their accounting period.
    • If 401(a) trusts must file their Form IL-990T by the 15th day of the 4th month following the end of their accounting period.

Where to mail payment Forms IL-1120-V, IL-1120-ST-V, IL-1065-V,
IL-1041-V & IL-990T-V?

Mail Form IL-1120-V to the following address:

Address Icon
Illinois Department of Revenue,
P.O. Box 19038,
Springfield, IL 62794-9038.

Mail Form IL-1120-ST-V to the following address:

Address Icon
Illinois Department of Revenue,
P.O. Box 19053,
Springfield, IL 62794-9053.

Mail Form IL-1065-V to the following address:

Address Icon
Illinois Department of Revenue,
P.O. Box 19053,
Springfield, IL 62794-9053.

Mail Form IL-1041-V to the following address:

Address Icon
Illinois Department of Revenue,
P.O. Box 19053,
Springfield, IL 62794-9053.

Mail Form IL-990T-V to the following address:

Address Icon
Illinois Department of Revenue,
P.O. Box 19053,
Springfield, IL 62794-9053.