Being younger than 18 does not matter for your Illinois state tax return. It does matter, however, if you are claimed a dependent on another person's return; your taxes will be up to $113 more if you are.
Otherwise, your federal adjusted gross income (with any applicable additions or subtractions) is subjected to Ilinois income tax at a rate of 4.95%. That Illinois tax amount is compared to what was withheld from your paycheck and reported in box 17 of your W-2. The difference is a refund or more tax due.
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