I have a company van and fuel. If it is a true ‘van’ ie two seats, not a crew cab then:
It costs tax on a flat rate of about £3200 for the van and £600 for the fuel (changes by the year).
So if you are a 20% tax payer then you get a brand new van and all running costs for £650 (van) and £120 (fuel) so £780 a year or £65 per month.
If you pay 40% tax then it is a total of about £1600 a year.
I can just run the van (VW of course) without any other car, so financially it saves me a heck of a lot. BUT beware of the van speed limits!!
So it is worth (to me):
The cost of buying / renting a vehicle for a year (£200pcm), insurance costs (£30pcm)*, tax cost (£10pcm)*, MOT cost (if old enough), tyres (£10pcm)*, fuel (£150pcm)*… total of about £400pcm.
With tax (20%) and NI I would need to earn £500 a month more (on my basic salary) to pay for it, so worth £6000 on my salary, minus the £780 it costs me… so about £5000??
*Disclaimer – all these figures are guesses as I don’t actually pay them… but I think they are close.