What you see is the method that Delaware uses to calculate Delaware nonresident tax. Delaware does not tax your Illinois income; however, it does pretend that all of your income is taxable in Delaware, calculates out the tax, and then prorates the result to the percentage of income you earned in Delaware. Since these calculations all take place on the Delaware nonresident return, it gives the appearance that Delaware is taxing your Illinois income. But they are not; they are only using the income to determine the tax on your Delaware income.
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