An IL-PIN is the account number the Illinois Department of Revenue assigns to a taxpayer after they have filed an Illinois individual income tax return. It is required to activate a MyTax Illinois account, request a Letter ID, or to use MyTax Illinois to file an IL-1040 return or make an income tax payment.
First time filers will not have an Illinois filing PIN. However, with a valid Illinois Driver's License or Illinois State Identification Card, they can e-file an Illinois return. Married filing joint filers will be required to enter valid Driver's License or State ID information for the spouse as well.
Once a return is successfully filed with Illinois, an eight digit IL-PIN will be issued.
If an Illinois return has been successfully filed in a prior year, visit IL-PIN inquiry or call 800-732-8866 to see if an IL-PIN has been issued.
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