Thanks for your reply. I have read multiple times that Argentina doesn't tax foreign pensions, but that's simply not true. Argentina taxes its tax residents on worldwide income, that is: including pensions. Important is that the general rule is that pensions are taxed. So there's no tax evasion. Apart from that, the more important questions are: (1) In which country are you tax resident? (2) What does the tax treaty (if exists) tell you about where what will be taxed. Levels of taxation are irrelevant.
So, in general pensions will be taxable, as part of worldwide income. What ís true though, is that pensioners in Argentina can profit from a relatively big deduction on their (pension) income: the deductable amount is equal to 8 times the minimum guaranteed pension. So taxable income is reduced and for pensioners with low pensions even zero. I believe that that's why some people are saying pension is not taxed.
In my case, I have calculated that my income tax percentage on my total pension income will be about 15% (based on current EUR/ARS). Very reasonable!