Is the box 15 for the two 'copy 2' forms both Illinois? Does one of the 'copy 2' forms appear to equal the bonus payment?
It may be that the amount has been segregated to report bonus income which is taxed at a higher rate. Contact your employer for an explanation.
Also see this.
If you reside in the state of Illinois, you are responsible for paying federal taxes on your bonus, in addition to Illinois state supplemental income tax withholdings.
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