Intercorporate investments IFRS 9

Do we have to know differences between rules based on IFRS 9 (compulsory from 2018 if I understand well) and what was applicable before?

I totally ignored stuff like earlier consolidation methods like pooling of interest and such. This is too much for me, honestly one set of rules is more than enough.

What do you guys think?

In the LOS, they do mention needing to know it. I took the exam last year (and failed hence I am back) but definitely be able to go back and forth between IFRS and GAAP. That will almost certainly be on there. As for the new ones, just know the “business test” difference and that amortized cost is effectively the same thing. Last thing to know is that once a method is chosen for equities it is irrevocable. Luckily the new standards are very similar so it is not much to add from a studying perspective.