Why can't I tax a car online?

[ajgoodfellow]

Seems like a common misconception.
https://www.parkers.co.uk/car-buying/2015/car-tax-top-five-myths-explained/

If you think about it the only thing that changes is who's card details go in at the end.

Thank you - learnt something today! It is interesting that it's top on the list - it definitely seems like a common misconception.