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Tak 23
Explains somewhat here: https://www.vanbreda.be/en/news/new-rules-for-supplementary-pensions-in-...
I don't know about TAK 23, but I have experience with a bonus being paid in to a SICAV and it could be withdrawn immediately. It's the latest wheeze to try and get around confiscatory taxation, so I'm sure it's a loop hole that will soon be closed.
If you withdraw before retirement age, it will be heavily taxed.