Interesting that this should pop up as I had this issue recently as a sole trader (not BIK but just tax capital allowance etc) and nobody seemed to have a clue so I ended up phoning HMRC to try and get a definitive answer....that was a laugh as you can imagine!
As far as I could work out a T32 Kombi with a payload over 1 tonne would be classed as a commercial vehicle so here goes.....
So, the first chap I spoke to I think was maybe one of the cleaners who they’d let loose on the phones for the day, I then finally got to speak to one of the inspectors and their answer was basically ‘it’s down to individual interpretation’ and 'they can’t give advice on individual circumstances' (so no chance of anything in writing). He did say however that a lot of the confusion comes from the way the VAT dept. treat this which is different than the way they do (the revenue dept)
Anyway, he did say that there are no specifics in their guidelines on Kombi vans but they have a definition for double cab pickups, again open to interpretation.
Meanwhile while chatting to him I found exactly what he was saying on an accountants firm's website, that as far as I can tell covers my vehicle, a T32 Kombi.
i.e. has dedicated load area bigger than the passenger seating area and,
has a payload of over 1 tonne (after the extra seats have been added)
………the VW T32 ticks both those boxes
So, bottom line was ‘do what you like and if we decide to investigate it will be down to the individual inspectors assessment’.
Great help, not.
For tax purposes we are going to treat it as a commercial vehicle, so there!
VAT is probably another world of pain but I'm not VAT registered, so there!