Like I said, it is a quirk between how NJ and NY reports their income, which does affect this. Part of the reason for the difference is that NJ considers 401K as taxable state income, whereas the federal does not. No way to adjust this for Illinois; you'll need to mail it in.
For your NJ return there is another area to check. Since you gave me exact amounts I can tell you what to put in the box. NJ has a question on double-taxed income, which refers to your NY income you earned while living in NJ. You will enter 33,191 (actually 33191.45, but you round down), which is the amount of NY income being taxed by NJ as well. For the tax paid on the double-taxed income, you will either add additional NY tax due to the NY tax withheld on your W2 or subtract refund to be received, and then multiply by .5302, which is the ratio between the NJ portion and the IL portion. This way, NJ tax is calculated correctly so you are not double-taxed by NJ either.
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