A bit of a hypothetical question at the moment but may be relevant to me in a couple of week's time. The MOT on my tug expires in mid-October but the tax is due on October 1st. If I have the MOT test done early (in September) and it fails (not that I expect it to) will the current MOT still be valid, allowing me to tax it online? I realise if it fails the vehicle is deemed un-roadwothy and should not be used even though I have the current MOT receipt/certificate. Having reread this post I suppose I'm asking if an MOT failure cancels a current valid certificate.