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Possible online services disruption due to Internet related outage

A worldwide technology outage is causing disruption to some State of Illinois online systems.  We are aware of this issue and are diligently working on restoration.

2023 Form IL-1040 Instructions

Mailing your income tax return:

If no payment is enclosed, mail your return to:

ILLINOIS DEPARTMENT OF REVENUE
PO BOX 19041
SPRINGFIELD IL 62794-9041

If a payment is enclosed, mail your return to:

ILLINOIS DEPARTMENT OF REVENUE
PO BOX 19027
SPRINGFIELD IL 62794-9027

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