Mouthy Money: Building wealth with long term investing and saving strategies

Why a pensions might be better than a Junior ISA for your kids

Mouthy Money: Building wealth with long term investing and saving strategies

Show Notes

Ed pays £50 a month into a junior ISA for each of his sons. At 18 it's legally theirs, and he can't do a thing about it. So what happens if he uses a pension instead? Full description Every month he puts £50 into a junior ISA for each of his two sons. On their eighteenth birthdays that money becomes theirs outright — no conditions, no drip-feed, no veto. So Ed modelled the alternative: the same £50 a month into a junior SIPP, a self-invested personal pension. Children get 20% tax relief despite paying no tax, which means £50 goes in as £62.50. Over a lifetime, that relief alone is worth £82,000. The catch is that they can't touch it until 57 at the earliest, and probably 60 by the time his sons get there. Chris and Ed work through the whole model — the tax relief, the charges, the inflation problem — and argue about whether an 18-year-old can be trusted with the money at all. We both end up somewhere we didn't expect. The numbers, at 8% growth and 0.5% annual charges: £10,200 paid in over 17 years becomes £19,930 in a junior ISA at 18, or £24,912 in a junior SIPP. Left alone to 60, that SIPP reaches £511,675. Restart contributions at 22 and it reaches £661,264, against £529,012 for the ISA. Raise charges to 1.2% and £181,915 disappears. Double the contribution to £100 a month and the pot hits £1,322,529 — which 3% inflation reduces to £231,211 in today's money. (00:00) I think I've been doing this wrong(01:12) The junior ISA as it stands(02:32) Chris makes the case for the ISA(05:02) Would an 18-year-old actually blow it?(06:31) The tax relief is worth £82,000(07:20) Junior ISA against junior SIPP at 18(09:01) What happens if they restart at 22(09:40) When can they actually access a pension?(10:30) What charges do to all of this(13:00) Only 23% of UK workers are on track for a moderate retirement(15:43) What £100 a month becomes(17:36) The inflation problem nobody talks about(20:00) Tax on the way out(20:49) What Chris is doing(21:23) What I've decided to do Full tables and charts, at both contribution levels and both charge scenarios, in cash and in today's money: [Substack link] Retirement Living Standards figures from Pensions UK, 2026 update, calculated by the Centre for Research in Social Policy at Loughborough University. Neither of us is a financial adviser and none of this is financial advice. All projections are illustrations based on stated assumptions, not forecasts. Investment returns are not guaranteed and tax rules change.

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