What is an Illinois PIN?

An Illinois PIN is a number assigned to you by the Illinois Department of Revenue that is used as a signature for e-filing your Illinois tax return.

If you filed Form IL-1040 last year and don't remember your Illinois PIN, you can look it up on the IL-PIN Inquiry Site  or call 1-800-732-8866.

If you don't have an IL-PIN you can still e-file your return using your Illinois driver's license or state ID information.

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