AIA gotta be the best way, if the van is expensive, you’d have a next to nothing to pay in tax when you file that’s years assesment.
And when you sell it you pay tax on the profit.
This is why they introduced it. It benefits the tax man in the end rather than us.
As a small business we are less likely to benefit from the complete vehicle claim in year one, but, as you say will get the full impact of tax when selling it.
This is exactly why they did away with write down allowance.
That’s assuming you sell when it’s still worth some dosh.
I bought my current transit custom for £14000 in 2016, it’s now worth only £3700

When I buy the new E transit custom sport, I will keep it for as long as possible, so it will be worth next to nothing when I one day sell it.
I’ve kept my current custom for almost 10 years now. AIA back then meant I paid a lot less tax. It was good deal for me!
With cash basis accounting, if I sell my current can for £3700 or whatever, then it only raises me income for the year by £3700, so hardly much in the way of extra tax. Nothing compared to the savings when I bought it…