When a load is created from a supplier and all the conditions previously noted above are satisfied regarding EPRs, the Deduct Royalty checkbox on the Load window is automatically checked, in the same way as Levy checkboxes:

Note that you can also turn off the Deduct Royalty flag for any particular load (for example if the supplier is both a grower and a trader and you are not the first buyer for this particular load).

The Financial Summary tab of the Load window shows the load financials including the EPR and Commission: