Tare weight
Tare is the mass of empty equipment: the container, the pallet, the trailer. Payload is what you may add without exceeding gross. VGM is cargo plus container tare. Typical tares here (2,230 kg for a 20ft, ~40 lb for a GMA) are averages. The CSC plate and pallet stamp are the numbers that go on paperwork.
Never copy a typical tare onto a VGM cut if you have the plate. Two 40HCs from different builders can differ by hundreds of kilograms.