You’re touching on some of the issues & challenges which may result e.g. (and this is non-exhaustive!), and expressed simply as points, which I’m sure you will join-up (I hope!):
1- Much depends on the nature of the pension entitlements in play, be this Defined Benefit (DB), Defined Contributions (DC), AVCs, SIPP e.g. what can you/cannot do.
2- You must understand the nature of the pension offering, especially DBs, and the benefits & downsides relative to each one, plus the tax implications of each route (for the pension monies themselves and your own income tax position).
e.g. with some DB schemes, they will pay 5 years of pension if you die early, often have a survivor’s entitlement (much reduced of course), probably offer a commutation option (25%?) at the cost of reducing the annual pension. Annual increases may be capped at CPI/max 4/5%? This is where details matter.
3- We all know UK tax rules and application have changed significantly since 2014(ish), with the introduction of LTA – and this aspect remains a mess.
Is taking a 25% commutation in tax-free (yippee!) cash the right thing – well, it depends on so many things e.g. what the residual pension is, what can you do with the redeemed cash (ISAs?), how will all of this affect your tax position. There are so many considerations here.
If you have a SIPP then there are a plethora of other considerations too.
@JimDog – if you are thinking of a scenario where there could be material investments which cannot be tax-shielded in ISAs, here’s some thoughts:
a- can you shield these over time e.g. use the £20k annual allowance over x years - but beware the limit changing adversely/even being abolished!
b- perhaps target growth structures over income, as you probably won’t want ‘income’ aggravating your personal tax profile?
c- do you even need the capital? Could you contemplate passing down to any kids now (s/t all considerations)?
d- you’ll need to have a heavy focus on CGT allowance, which is now only £3k p.a. (in UK), which will mean recycling investments to manage to this.
e- if you exceed BRT level, say ~£52k in declarable personal income (base income/non-ISA interest/property income/dividends et al), then you may be advised to consider tax-mitigating moves like Venture Capital Trusts (VCTs), which can be used to recycle capital, but with risks.
This is why using an IFA, at least at the outset, can assist.
Things get even more complicated when you consider State pension entitlements too, on top of any other incomes. You’ve probably seen recent media articles about the ‘frozen allowances’ pulling more pensioners in to the tax net, with an increasing picture of tax capture from this segment of society e.g. in practicable terms, this can mean that while you set everything up now to avoid paying 40% (or not exposed to much of it?!), this net will tighten as (say) DB and State pension payments increase.