It depends. Were you physically present in Illinois or teleworking? If you worked in Illinois, then those days would be Illinois income.
If you worked remotely, we would need more information about your duties to clarify your situation. Illinois taxes:
- earned income from any source while you were a resident,
- earned income from any Illinois sources while you were not a resident, or
Illinois does not follow what is known as the “convenience of the employer” rule, which taxes teleworkers unless remote work is required by an employer. Additionally the state has only issued guidance covering out of state employers who employ Illinois residents. So your income is probably not taxable to Illinois if you work remotely. However each case is facts and circumstance based.
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