We will apply each payment to the earliest due date until that liability is paid, unless you provide specific instructions to apply it to another period.
what was left out "which is later".
by the way instructions on forms, instructions and even publications are not legally binding. It's what's in the written law - ILL statutes that counts. there was even a big court case (federal level) about wording in instructions and publications, the taxpayer went by what was said in the instructions. they lost.
you can try your way but don't be surprised if illinois recomputes your penalty. and as you have seen TT dosn't allow it which means you would have to override TT comps which makes its accuracy guarantee void and you will not be able to efile
