Hi John! The frequency of periodic inspections depends on the type and age of your vehicle. When your vehicle is due for inspection, you will receive an inspection notice from LTA within 3 months before your vehicle’s inspection due date. If your vehicle is due for inspection, you need not produce the LTA’s inspection notice to have it inspected. Please refer to the link for more details: https://onemotoring.lta.gov.sg/content/onemotoring/home/owning/ongoing-car-costs/inspection.html

Source: LTA