It depends. If your intention is to return to Illinois and your residence in Japan is temporary, then you are still considered an Illinois resident for tax purposes. If you were required to file a federal return or if your Illinois base income from Line 9 on Form IL-1040 is greater than your Illinois exemption allowance, you would need to file an Illinois state return.
Depending upon your filing status, you can use this chart to determine what your exemption amount would be.
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