All Australian States and Territories stipulate maximum darkness, known as the visible light transmission level or VLT, for the aftermarket application of window film on a passenger vehicle’s side and rear windows. These laws regulate how dark you can legally tint your car windows – which is why the phrase “darkest legal” is used so often.
As of November 2018, all States/Territories have introduced new requirements for the window behind the driver (windows behind the B pillar). 20% VLT on windows behind the driver is allowed in Queensland.
After-market window film cannot be applied to the windscreen, even if the film is optically clear, except for a visor strip across the top of the screen (which is outside the driver’s primary vision area). Each State/Territory stipulates how this visor strip should be measured.