However, the management of HFC quotas could be more complicated than HCFC quota since (i) many more HFC substances are currently being used in the market in various sectors compared to HCFCs, and new HFC blends with lower Global Warming Potential (GWP[1]) might be introduced into market from time to time; (ii) The GWP values of the controlled HFCs/HFC blends vary significantly, which might mislead the sectoral needs of HFCs and the compliance target; Such dynamic characteristics coupled with the phasedown instead of phaseout can have an impact on the quota allocation, trading, and monitoring etc. As HFC consumption in most countries is determined by their import, this document aims to highlight guiding principles and key aspects that countries need to consider when developing their import quota system. The underlying principles and approaches are equally applicable for production and export quota allocation.