Hi Richard, thank you for leaving a question. After you win a bid, you will be given a Temporary COE (TCOE). The TCOE is valid for 6 months for Categories A, B and D, and 3 months for Categories C and E. You must register your vehicle before your TCOE expires. Once the TCOE expires, it can no longer be used and you will forfeit your full bid deposit. Check this link for more information: https://onemotoring.lta.gov.sg/content/onemotoring/home/buying/upfront-vehicle-costs/certificate-of-entitlement--coe-.html