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Your son suggests a return of 6%. That would have to be after fees and tax. It’s probably a reasonable assumption if the money is invested in a share fund or a non-KiwiSaver aggressive fund.You would need to stick with it – not switching when the balance falls in a market downturn. If that’s likely to be difficult for you, use a lower-risk fund and settle for a lower end balance.As your son acknowledges, inflation will eat into how much a future balance will buy. But it will still be great for the recipient – for perhaps a house deposit, or to repay a chunk of a mortgage.The amount a recipient puts in to keep the scheme running would need to be adjusted for inflation.If you have more than one child, obviously you would want to do the same for all of them. But what if one of your children has more kids than another?Cousins will be treated unequally. Maybe that’s okay, but it’s worth thinking about.What if one of your children has no offspring? Perhaps you could specify that they give the money to a charity of their choice.

Small difference becomes big

Stay with insurance

How much? Dunno

When to switch

You’re getting nearer to the time you expect to spend the money. In those circumstances, it can work well to move your money in, say, three lots, a month or two apart. That way you avoid happening to make the move at a bad time.You realise you can’t tolerate downturns as much as you thought you could. But, as stated above, you must then stay in the lower-risk fund for the long term.

Not so possible