scope of IAS12

Dear tutor,

In a given country (Vietnam) and for a given type of structure (rep office), the income tax liability can be calculated based on 2 methods:
1. profit to which we apply a certain rate
2. revenue (and not profit) to which we apply another rate
The type of tax is clearly stated as corporate income tax in the local law decree. Usually the revenue is used in order to simplify the assessment of liability (for such type of structure, there are usually no local accounting books).

For my IFRS books, I want to know if IAS 12 applies (looking at substance, this clearly is income tax and in theory this is the method 1 for assessment), or whether this falls under another standard and then not considered in my books as income tax expense (reporting under operating profit).

Your thought is very much appreciated, but I am also happy if you can guide me on where to find the answer…