The £3,500 grant still applies to the cost price of the car to the lease company, but IIRC is not deducted when calculating the p11d value (which is irrelevant for the 2020/21 tax year as it is 0%).
As mentioned above, the lease cost is met from gross pay which means you get tax relief at your highest rate, plus also National Insurance savings (normally 2%).
My employer is chucking back in their NI saving too, which saves me a further 13.8% on the cost.
For some companies (but not all) there are VAT savings as well, with 10% VAT reclaimable on the cost.
For some people there may be further tax savings:
- If you have children and sacrifice takes income below £60k then you may be able to reclaim some child benefit.
- If your sacrifice takes you below £125,000 then you are able to reclaim some Personal Allowance (nil rate income tax band)
You still qualify for the OLEV grant also with a lease when purchasing a home charger.
After going through all of the above for me it was a no brainer. I've never leased before, always done PCP, but with the BIK rates it as too good to pass on for my circumstances.
Things to watch out for are impacts on pension benefits as your employer could base your contributions/benefit accrual on the lower salary after sacrifice (some may be happy however to still use the pre sacrifice figure in calculating benefits after negotiation - mine is)
with all these savings for me the costs under salary sacrifice were too good to pass on!