Applying Form F in Sales Tax

hungryandfool

Hi Experts,

I have a scenario where my client does some reprocessing on materials provided by the their customers and returns back the reprocessed material to them.
Now in case the customer provides form F to my client then Sales Tax is applied on the reprocessing job value, but in case he dosent provide any Form F then Sales Tax is applied on reprocessing job value as well as material value also. And the point to be considerd is that the material value is only used for Tax calculation and should not be reflected in the accounts otherwise in anyways.

Please help.