Hi Trevor
We include a clause regarding how much will be written back and refer to it as a percentage of the rebate proportionate to the number of full quarters remaining.
Our experience is the majority take it into account. Some have difficulty working out the write back (and then settle on the quarter to make it easy). Some don’t bother to take it into account ( a small minority)
I like it cause at least we have made the statement on the cert and have something to refer back to.
Robert