Self assessment for private expenses - new claimHi, I have recently taken a job where I will use my own vehicle for significant business usage. I will need to claim a portion of the allowance via self assessment as my company does not pay the full amount. I am on PAYE. I begin the job in March, but I have missed the self assessment deadline. Will I be able to claim any tax relief for the upcoming year? If so, how can I go about it?