In-vehicle unit (IU)
The in-vehicle unit, or IU, is the device fitted to every Singapore-registered vehicle that deducts ERP charges and some carpark fees from a stored-value card.
What it means
The in-vehicle unit is the small device usually mounted on the dashboard or near the windscreen of a Singapore-registered vehicle. Its main job is to handle automatic payment. When an owner inserts a stored-value card, such as a CashCard or other approved card, the IU deducts the relevant amount whenever the vehicle passes an ERP gantry during a charging period. Many carparks also use the same IU to charge entry and exit fees, so the device doubles as a cashless parking tool. The IU is registered to a specific vehicle, and it is the driver's responsibility to keep a valid card with enough value loaded, since passing a gantry with no card or insufficient value can lead to a charge being recovered later, sometimes with an administrative fee. Singapore is rolling out a next-generation on-board unit as part of the move to satellite-based ERP, which expands the device's role beyond simple gantry deduction.
Why it matters in Singapore
Because the IU is the payment point for ERP and many carparks, a faulty or empty unit can turn a routine drive into an unexpected bill. Owners need a working IU and a topped-up card to use priced roads and many parking facilities without trouble. The IU stays with the vehicle, so when a car changes hands the device usually goes with it, and any replacement or upgrade of the unit is handled through the authorised process.
What it means for car owners
The IU is a functional fixture, not a styling or maintenance concern, so it has no direct effect on a car's condition or resale value. It is worth knowing where it sits, though, because the dashboard area around it sees daily handling and can pick up scuffs and sun fading over the years. Keeping the interior clean and protected, the cabin, dashboard, and trim included, is part of how Revol Carz helps a car still look cared for when it is time to sell or hand it over.