Based on what you have stated, you were a Delaware resident all year, even though you worked temporarily in Illinois. Working temporarily in another state (even if you rent an apartment) does not make you a resident of that state (just like staying in a hotel for a week while traveling to another state doesn't make you a resident of that state). Neither does tax withholding determine state of residence or how the associated income is taxed. As a Delaware resident, 100% of your income, regardless of what state you earned it in, is taxable by Delaware. Since you worked in Illinois, they tax the income you earned there. To keep from being double taxed, Delaware will give you a tax credit for the tax you pay to Illinois. I suggest you delete and re-add both of your state tax returns, and start them over. You should prepare your Illinois Non-Resident state first. When asked if you lived in another state, answer no.
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