Assets must be allocated to the appropriate RSF factor based on their residual maturity or liquidity value. When determining the maturity of an instrument, investors must be assumed to exercise any option to extend maturity. In particular, where the market expects certain assets to be extended in their maturity, banks must assume such behaviour for the purpose of the NSFR and include these assets in the corresponding RSF category. For amortizing loans, the portion that comes due within the 1-year horizon can be treated in the less-than-1-year residual maturity category.