• File your return electronically! Visit mytax.illinois.gov or see your tax professional. 
• Make sure you have all your documents ready. Common documents, records, or receipts you may need to help you file are
• a copy of your federal income tax return and schedules;
• copies of all W-2 and 1099 forms;
• tax returns you filed with other states;
• your property number and amount of property tax paid;
• receipts for qualified education or moving expenses; and
• your routing and account number if you are due a refund and choose to deposit your refund directly into your checking or savings account. 
• Enter your correct Social Security number (SSN) and name. If you are married, you must include your spouse’s SSN and name. 
• Review the entries you made on each line for accuracy and verify your calculations. For example, verify the amount of income tax withheld.
• Sign your return. 

For more information, see Form IL-1040 Instructions.