1. The first €400k received by the beneficiary is exempt; when receipts go above that he starts paying tax.
Note that it's €400k from all donors within what's called Group A. So if the child receives, in this order, €100k from Dad and then €50k from Mum, and then €300k from a trust established and funded by Mum and Dad, all those donors are in Group A, so:
- no CAT liablity on the first €100k received;
- no CAT liablity on the next €50k; but
- when the €300k comes in, total gifts/inheritances from Group A now amount to €450k, so the threshold has been exceeded. CAT is due on €50k. Any further gifts/inheritances that come in from Group A will attract CAT on the full amount.
2. This will will neeed to be professionally drawn up and it will have to include the full provisions that are necessary or desirable to govern a discretionary trust, which are extensive; you're not going to get this in a make-your-own-will kit. How is the money to be invested and managed by the trustees? Is there anything they must do? Anything they may not do? What happens if the child dies while there is still money in the trust — who gets it? If the child marries and/or has children, can the spouse/children be given money from the trust or is the child the only permitted beneficiary? Etc, etc. It's not just a matter of finding the right legal boilerplate text to stitch into the will; there are actually big decisions to be made when setting up a trust of this kind; you'll need professional advice to identify the decisions that you have to make, and to guide you through the process of actually making them.
The will does have to name the trustees, but you can foresee and provide for some contingencies — e.g. "I appoint my brothers and sisters A, B, C and D as trustees"; if B dies before you the appointment of A, C and D will still take effect so you don't have to alter your will unless, e.g., you want to nominate some other trustee instead of B. Or "I appoint A and B as trustees but if either of them is unwilling or unable to act then I appoint C in the place of that person". That kind of thing.
The letter of wishes tell the trustees your thoughts about the decisions that they will make. But it is the will which will determine what decisions they can make — there is no point in writing a letter saying that you would like the trustees to do X if the terms of the trust don't allow the trustees to do X, or require them to do Y instead.