The 75% taxable tail nobody talks about
Take the most-cited pension argument: "40% relief in, 20% out — you're up 20 percentage points on tax arbitrage." The arithmetic is right but it ignores the contribution cap that ate the cake.
The pension commencement lump sum caps the 25% tax-free withdrawal at £268,275 — the same number it has been since Lifetime Allowance abolition in April 2024. Build a pot bigger than £1,073,100 and the cap binds: any pound above £1.073 million is 100% taxable on withdrawal, with zero tax-free element.
A 32-year-old contributing £20,000 a year via salary sacrifice (employee plus employer combined) at 6% real growth hits £1,073,100 around age 53 — five years before they can even access the money. Every additional year of contributions or growth lands fully into the taxable column. By 60, the £1.5 million pot has £268,275 of tax-free money and £1.23 million of fully taxable money.
Drawdown that £1.23 million at £50,000 a year for 25 years (assuming continued growth covers the deficit) and the recipient sits squarely in the higher-rate band on most years once the state pension at £12,548 lands. Effective tax on drawdown income above £50,270: 40%. The supposed 40-to-20 arbitrage is, in practice, often a 40-to-40 wash with extra steps.
The LISA does the opposite. Every penny of growth, every penny of bonus, every penny of original contribution comes out at 60 with no tax — no personal allowance, no marginal rate calculation, no interaction with state pension or other income. £100,000 in a LISA at 60 is £100,000 in your pocket. £100,000 in pension drawdown above the lump-sum cap is £60,000 in your pocket if the rest of your income puts you in the higher-rate band.