We are in the process of testing the Phase II patching (CTP & EMSS patching) for the 2020 W4. KB 2096388 states that additional fields were added to the State Withholding screen to allow use by those states utilizing the Fed W4 - but we are noticing a difference in the calculation of IL withholding (does not utilize Fed W4) when data is populated in those fields that are not applicable to the IL W4. To test, we populated data in the 4 bottom boxes (circled below) ONLY for an IL employee and expected to see no change in their withholding - we experienced a difference. We made no change to the 4 top boxes that are required for IL. Anyone else experience this difference for states that do not use the Fed W4?
