I imagine that you're talking about the cost of the measure and not the amendment in this part of the bill.
The department estimates that government revenues will decline by $62 million in 2020-21 and 2024-25.
I don't know the exact number of companies that could take advantage of this measure. These are estimates, of course. There's always some uncertainty.
I can tell you that the mining sector, in particular, has expressed strong interest in this measure.