Thank you - it looks like people are filing for the credit and getting it successfully.
When I read the instructions for Illinois Schedule CR: column b, you are to put the non-Illinois income “as determined using Illinois’ rules for sourcing income.” I cannot for the life of me find Illinois’ rules for sourcing income anywhere... Therefore, I assumed that income sourced in IL-state would not be eligible for the credit. California has a similar rule for denying credit, but you can easily read about this online.
