Hi Charlie, thank you for your question. You don't have to go to the physical office to change the vehicle scheme. You can convert the scheme of your car online @ onemotoring.lta.gov.sg (available from 6am to midnight daily). You will need to log in using your Singpass 2FA.

You will need to pay a conversion fee of $100 and top-up the road tax for your converted car. You must also change your car's red number plates to normal ones within 3 calendar days.

Click this link for more details: https://onemotoring.lta.gov.sg/content/onemotoring/home/owning/scheme-conversion.html