what I'm trying to point out is, that because this is what VRBO sends you, my tax figures are out. This is a problem in that it means I need to make a manual adjustment to ensure my tax figures are correct.

The solution is to either (1) liaise with VRBO to have this "discount" figure broken down into the 2 separate components when communicated to you, or (2) recognise on the hostfully side that there will always be a tax component, and break it down into the 2x figures based on the property tax rate