The NHS scheme would have to be significantly better value for me to consider messing with my pension. What is the cumulative effect from the salary sacrificed over a lifetime?
Really hard to know, it may be minimal (ie reaching lifetime allowance a bit later, not really a big issue) but it all depends on rules that haven't been decided yet.
This was posted on pistonheads, can't vouch for the legitimacy:
"Someone on the previous thread asked me to explain how an NHS lease reduces your pension, with full figures, so I'lll have a go.
The 2015 pension scheme, which anyone under around 57 years old is now on, is a career average based scheme. It is calculated by dividing your annual salary after each financial year by 54, and that amount goes into a 'pot'. You will have extra pots after every subsequent financial year. Each pot is revalued every year, at 1.5% above inflation, so if inflation was 2% in the last year, all the pots are revalued by 3.5%. Once you retire, all the pots are added up, and the total is paid to you annually.
As an example, someone earning 40K throughout their career of 10 years would gat the following pension (ignoring any future inflation):
Year 1: 40,000/54 = £740 compounded by 1.5% for 9 years = £846.11
Year 2: 40,000/54 = £750 compounded by 1.5% for 8 years = £833.60
Year 3: 40,000/54 = £750 compounded by 1.5% for 7 years = £821.29
Year 4: 40,000/54 = £750 compounded by 1.5% for 6 years = £809.15
Year 5: 40,000/54 = £750 compounded by 1.5% for 5 years = £797.19
Year 6: 40,000/54 = £750 compounded by 1.5% for 4 years = £785.41
Year 7: 40,000/54 = £750 compounded by 1.5% for 3 years = £773.80
Year 8: 40,000/54 = £750 compounded by 1.5% for 2 years = £762.37
Year 9: 40,000/54 = £750 compounded by 1.5% for 1 year = £751.10
Year 10: 40,000/54 = £750 compounded by 1.5% for 0 years = £740
Once you add the 10 pots up, it gives an annual retirement income of £7920.02
If someone takes out an NHS car lease of £300/month, that means their salary drops by £3600 to £36,400. So the pot that year will drop from £740 to £650, a £90 decrease, and will be decreased by the length of the lease e.g. 3 year lease = £90x3 = £180 less a year in NHS pension. If a person has 30 years left in work before retiring, that £180 would have been rebalanced every year by at lease 1.5%. That gives £240 less a year.
£240 doesn't sound that much, but that's £4800 on a 20 year retirement, and if you have multiple leases if can add up to much more than that.
It MAY be worth it for higher rate tax payers to take put an NHS lease, but I wouldn't do it as a 20% tax payer myself."