@Hal_Al I can answer that question. No, IL will not allow you to amend returns to claim the credit, as I attempted to do so and the claim was rejected.
@Mike9241 However, I still do not have a definitive answer to my question. I wasn’t asking IF the credit was allowed—I already know it was not. My question was, isn’t that double taxation? Paying two states (equal taxing authority) FULL income tax on the SAME income, without a credit for tax paid to the other state.
