[pmg101]

Your car isn't 'effectively free', because you could sacrifice all £20k into the pension, paying no tax on it, and get the £12k in childcare subsidies because your income is <=£100k. The EV is costing you £7000 pa out of this.

It still might be desirable, but it isn't free.

[physicsguy]

If you're at that income level, your employer pension contribution is already likely high and you've likely been stacking it for a while anyway. At some point there is a diminishing return to how much you should put in your pension too; it's tax on exit after all. You only need 2-3 years of maxed out contributions in your late 20s/early 30s to set yourself up very well for the future.

[bluGill]

If your income is that high the pension is likely something you have anyway