Here's an arithmetic question that surprises almost everyone the first time they see it.

Two grandparents both want to do something meaningful. The first hands the parents €600 on the day the baby is born. Generous, memorable, cash now. The second sets up a standing order for €25 a month from the same date, and quietly forgets about it. Eighteen years go by. Both gifts go into the same global ETF.

Which grandparent gave more, by the time the kid turns 18?

The math

The €600 lump sum, invested at the long-run global equity average of about 8% per year, becomes roughly €2,400 by the time the kid is 18. A respectable four-times return.

The €25 a month, sustained for eighteen years, becomes roughly €12,000.

The monthly grandparent put in the same amount of money over the period (€25 × 12 × 18 = €5,400 versus €600). They put in nine times as much in absolute terms. But that's not where the magic comes from. The magic comes from the fact that those €25 contributions are buying ETF shares throughout the eighteen years, including during the years where the market was down and the shares were cheap. Compounding likes consistency. Lump sums like timing.

What the lump-sum giver gets wrong

This isn't to say you shouldn't give a lump sum. The €600 grandparent did a lovely thing. Plenty of children will have nothing more than what their immediate family puts in, and a lump sum at birth is a real gift.

What the lump-sum-only model misses, though, is something investing professionals call dollar-cost averaging. When you put €25 in every month, regardless of what the market is doing, two things happen automatically:

  • You buy more shares in the months when the market is down. (More shares for the same €25.)
  • You buy fewer shares in the months when the market is up. (Fewer shares for the same €25, but each share is worth more.)

Over eighteen years, you end up with a higher average number of shares per euro than you would have if you'd timed a single purchase, because you didn't try to time it at all. You just bought every month.

The professional investor calls this discipline. The generous grandparent calls it "I just set it and forgot it."

A small monthly habit beats one big gift

The reason this matters for FromUs specifically is that most people, when they think about giving to a kid, think in terms of one big gesture. The wedding-gift instinct. The €100 in an envelope. They don't think of the €25 standing order, even though the standing order is the better gift and is easier on the giver's pocket.

This is part of what we want to make easy on the gift page. A grandparent shouldn't have to write a complicated bank instruction to set up a recurring contribution. They should be able to click "monthly", choose €25, and walk away. Eighteen years later, the kid opens their page on their 18th birthday and finds something genuinely life-changing waiting for them, from a grandparent who never thought of themselves as having done anything special.

That's the magic of the boring habit. €25 a month, for eighteen years, beats one big birthday gift. Not because the giver tried harder. Because compounding plus discipline plus time is the most generous force in personal finance, and the giver let it run.

Ben