Forex income, it's not taxable right no matter how much you earn. Only that when you transfer the money to your bank, if it exceed certain amount, you might have to declare it. That's all. Can someone confirm this?

For money in, if they ask where it come from, just say forex, they will understand you. Just that if you exceed certain threshold, you have to declare for legal purpose, nothing else.

For money out, you have to declare if exceed RM5k ( Maybank, not sure other bank). Just say forex, they won't question further. This is already valid reason.