Normal person. One off payment of 6k into an ISA wrapper:-
6,000 @ 1.05 ^^ 20 = 15999
Normal Person. Same payment into pension including relief
10,000 @ 1.05 ^^ 20 = 26532
6,000 @ 1.05 ^^ 20 = 15999
Normal Person. Same payment into pension including relief
10,000 @ 1.05 ^^ 20 = 26532
Isa
6,000 @ 1.05 ^^ 20 = £15,919
Pension
10,000 @ 1.05 ^^ 20 = £26,532
I assume no tax on investment income from money held in one's own name, and 22% on money in a pension annuity.
Let's subtract 25% x £26,532 = £6,633 from both amounts to take the lump sum out of the equation. (An amount equivalent to lump sum is invested and taxed the same way in both scenarios. A basic-rate taxpayer investing in shares need pay no more tax than if his money were in an ISA, in any case most of the average persons lump sum could be transferred into an ISA in very few years.)
Then we are looking at ISA £9,287 versus pension 78% x £19,898 = £15,521. So the extra after-tax money at work in the pension is £15,521 - £9,287 = £6,234.
If we assume all amounts earn 5% before tax, then the ISA route gives us 5% x £15,919 = £796 income, but the pension route gives us 5% x £6,234 = £311 extra income, i.e £311/£796 = 39% higher income.
(In my case, if I were 30 years older and buying an annuity now, I would invest all money in my own name in commercial property funds, and invest the residual pension pot in a unit-linked annuity in a property fund. Commercial property yields roughly 5% at the moment. So my assumptions that all money can be invested for the same return, and that return is about 5%, are not that unreasonable.)

and they take a rake-off too. Darts thrown at the market pages have a better record than most fund managers. And the top quartile of funds over the last 5 years consistently underperforms the market in the next year. 
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