Vertex Update January 2024 - Washington

Washington had the following changes per vertex in January

Where would one go to check the taxability of an employer paid benefit?

For example Employer Paid Medical for certain taxes changed from Taxable to Exempt for certain tax types. This is not controlled by a radio button on the PDBA setup for ER Medical. I don't believe that you would control this on the P0701735 program nor would you setup a tax exemption because as a benefit with an effect on check it is already a 1. So how would this be handled or is this something vertex passes to E1, but again how would it know what DBAs?