1. Yes. College is considered a temporary absence from home.
2. You are an IL resident so you file an IL resident return.
3. You earned income from Missouri. If it is $600 or more, you will file a nonresident MO return. See Individual Income Tax FAQs - Missouri Department of Revenue
4. Yes, IL will give you a credit for the double taxed income. Prepare the nonresident MO return first before completing your IL return.
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